102 lines
3.4 KiB
C
102 lines
3.4 KiB
C
/*
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* Copyright (c) 2009, Swedish Institute of Computer Science.
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* All rights reserved.
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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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* 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 the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be 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 INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/**
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* \file
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* MAC framer that does nothing...
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* \author
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* Niclas Finne <nfi@sics.se>
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* Joakim Eriksson <joakime@sics.se>
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*/
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#include "net/mac/framer/framer.h"
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#include "net/packetbuf.h"
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#ifdef NULLFRAMER_CONF_PARSE_802154
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#define NULLFRAMER_PARSE_802154 NULLFRAMER_CONF_PARSE_802154
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#else
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/* defaults to parsing of the 802154 header as that is used for Slip-Radio */
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#define NULLFRAMER_PARSE_802154 1
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#endif
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/*---------------------------------------------------------------------------*/
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static int
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is_broadcast_addr(uint8_t mode, uint8_t *addr)
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{
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int i = mode == FRAME802154_SHORTADDRMODE ? 2 : 8;
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while(i-- > 0) {
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if(addr[i] != 0xff) {
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return 0;
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}
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}
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static int
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hdr_length(void)
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{
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/* never adds any header */
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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create(void)
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{
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/* nothing extra... */
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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parse(void)
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{
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#if NULLFRAMER_PARSE_802154
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frame802154_t frame;
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int len;
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len = packetbuf_datalen();
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if(frame802154_parse(packetbuf_dataptr(), len, &frame)) {
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if(frame.fcf.dest_addr_mode) {
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if(!is_broadcast_addr(frame.fcf.dest_addr_mode, frame.dest_addr)) {
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packetbuf_set_addr(PACKETBUF_ADDR_RECEIVER, (linkaddr_t *)&frame.dest_addr);
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}
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}
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packetbuf_set_addr(PACKETBUF_ADDR_SENDER, (linkaddr_t *)&frame.src_addr);
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packetbuf_set_attr(PACKETBUF_ATTR_MAC_SEQNO, frame.seq);
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packetbuf_set_attr(PACKETBUF_ATTR_MAC_ACK, frame.fcf.ack_required);
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return 0;
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}
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#endif
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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const struct framer no_framer = {
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hdr_length,
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create,
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parse
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};
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