136 lines
4.5 KiB
C
136 lines
4.5 KiB
C
/*
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* Copyright (c) 2010, 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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* This file is part of the Contiki operating system.
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*
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*/
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/**
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* \file
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* The 802.15.4 standard CSMA protocol (nonbeacon-enabled)
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* \author
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* Adam Dunkels <adam@sics.se>
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* Simon Duquennoy <simon.duquennoy@inria.fr>
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*/
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#include "net/mac/csma/csma.h"
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#include "net/mac/csma/csma-output.h"
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#include "net/mac/mac-sequence.h"
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#include "net/packetbuf.h"
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#include "net/netstack.h"
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/* Log configuration */
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#include "sys/log.h"
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#define LOG_MODULE "CSMA"
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#define LOG_LEVEL LOG_LEVEL_MAC
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/*---------------------------------------------------------------------------*/
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static void
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send_packet(mac_callback_t sent, void *ptr)
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{
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csma_output_packet(sent, ptr);
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}
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/*---------------------------------------------------------------------------*/
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static void
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input_packet(void)
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{
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#if CSMA_SEND_SOFT_ACK
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uint8_t ackdata[CSMA_ACK_LEN];
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#endif
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if(packetbuf_datalen() == CSMA_ACK_LEN) {
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/* Ignore ack packets */
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LOG_DBG("ignored ack\n");
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} else if(NETSTACK_FRAMER.parse() < 0) {
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LOG_ERR("failed to parse %u\n", packetbuf_datalen());
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} else if(!linkaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
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&linkaddr_node_addr) &&
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!packetbuf_holds_broadcast()) {
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LOG_WARN("not for us\n");
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} else if(linkaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_SENDER), &linkaddr_node_addr)) {
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LOG_WARN("frame from ourselves\n");
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} else {
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int duplicate = 0;
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/* Check for duplicate packet. */
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duplicate = mac_sequence_is_duplicate();
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if(duplicate) {
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/* Drop the packet. */
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LOG_WARN("drop duplicate link layer packet from ");
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LOG_WARN_LLADDR(packetbuf_addr(PACKETBUF_ADDR_SENDER));
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LOG_WARN_(", seqno %u\n", packetbuf_attr(PACKETBUF_ATTR_MAC_SEQNO));
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} else {
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mac_sequence_register_seqno();
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}
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#if CSMA_SEND_SOFT_ACK
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if(packetbuf_attr(PACKETBUF_ATTR_MAC_ACK)) {
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ackdata[0] = FRAME802154_ACKFRAME;
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ackdata[1] = 0;
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ackdata[2] = ((uint8_t *)packetbuf_hdrptr())[2];
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NETSTACK_RADIO.send(ackdata, CSMA_ACK_LEN);
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}
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#endif /* CSMA_SEND_SOFT_ACK */
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if(!duplicate) {
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LOG_INFO("received packet from ");
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LOG_INFO_LLADDR(packetbuf_addr(PACKETBUF_ADDR_SENDER));
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LOG_INFO_(", seqno %u, len %u\n", packetbuf_attr(PACKETBUF_ATTR_MAC_SEQNO), packetbuf_datalen());
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NETSTACK_NETWORK.input();
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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static int
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on(void)
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{
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return NETSTACK_RADIO.on();
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}
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/*---------------------------------------------------------------------------*/
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static int
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off(void)
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{
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return NETSTACK_RADIO.off();
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}
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/*---------------------------------------------------------------------------*/
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static void
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init(void)
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{
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csma_output_init();
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on();
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}
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/*---------------------------------------------------------------------------*/
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const struct mac_driver csma_driver = {
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"CSMA",
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init,
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send_packet,
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input_packet,
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on,
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off
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};
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/*---------------------------------------------------------------------------*/
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