/*
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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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* A null RDC implementation that uses framer for headers.
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* \author
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* Adam Dunkels <adam@sics.se>
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* Niclas Finne <nfi@sics.se>
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*/
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#include "net/mac/nullrdc.h"
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#include "net/packetbuf.h"
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#include "net/queuebuf.h"
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#include "net/netstack.h"
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#include "net/rime/rimestats.h"
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#include <string.h>
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#if CONTIKI_TARGET_COOJA
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#include "lib/simEnvChange.h"
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#endif /* CONTIKI_TARGET_COOJA */
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define PRINTF(...) printf(__VA_ARGS__)
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#else
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#define PRINTF(...)
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#endif
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#ifdef NULLRDC_CONF_ADDRESS_FILTER
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#define NULLRDC_ADDRESS_FILTER NULLRDC_CONF_ADDRESS_FILTER
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#else
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#define NULLRDC_ADDRESS_FILTER 1
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#endif /* NULLRDC_CONF_ADDRESS_FILTER */
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#ifndef NULLRDC_802154_AUTOACK
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#ifdef NULLRDC_CONF_802154_AUTOACK
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#define NULLRDC_802154_AUTOACK NULLRDC_CONF_802154_AUTOACK
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#else
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#define NULLRDC_802154_AUTOACK 0
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#endif /* NULLRDC_CONF_802154_AUTOACK */
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#endif /* NULLRDC_802154_AUTOACK */
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#ifndef NULLRDC_802154_AUTOACK_HW
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#ifdef NULLRDC_CONF_802154_AUTOACK_HW
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#define NULLRDC_802154_AUTOACK_HW NULLRDC_CONF_802154_AUTOACK_HW
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#else
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#define NULLRDC_802154_AUTOACK_HW 0
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#endif /* NULLRDC_CONF_802154_AUTOACK_HW */
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#endif /* NULLRDC_802154_AUTOACK_HW */
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#if NULLRDC_802154_AUTOACK
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#include "sys/rtimer.h"
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#include "dev/watchdog.h"
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#ifdef NULLRDC_CONF_ACK_WAIT_TIME
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#define ACK_WAIT_TIME NULLRDC_CONF_ACK_WAIT_TIME
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#else /* NULLRDC_CONF_ACK_WAIT_TIME */
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#define ACK_WAIT_TIME RTIMER_SECOND / 2500
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#endif /* NULLRDC_CONF_ACK_WAIT_TIME */
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#ifdef NULLRDC_CONF_AFTER_ACK_DETECTED_WAIT_TIME
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#define AFTER_ACK_DETECTED_WAIT_TIME NULLRDC_CONF_AFTER_ACK_DETECTED_WAIT_TIME
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#else /* NULLRDC_CONF_AFTER_ACK_DETECTED_WAIT_TIME */
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#define AFTER_ACK_DETECTED_WAIT_TIME RTIMER_SECOND / 1500
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#endif /* NULLRDC_CONF_AFTER_ACK_DETECTED_WAIT_TIME */
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#endif /* NULLRDC_802154_AUTOACK */
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#ifdef NULLRDC_CONF_SEND_802154_ACK
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#define NULLRDC_SEND_802154_ACK NULLRDC_CONF_SEND_802154_ACK
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#else /* NULLRDC_CONF_SEND_802154_ACK */
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#define NULLRDC_SEND_802154_ACK 0
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#endif /* NULLRDC_CONF_SEND_802154_ACK */
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#if NULLRDC_SEND_802154_ACK
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#include "net/mac/frame802154.h"
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#endif /* NULLRDC_SEND_802154_ACK */
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#define ACK_LEN 3
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#if NULLRDC_802154_AUTOACK || NULLRDC_802154_AUTOACK_HW
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struct seqno {
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rimeaddr_t sender;
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uint8_t seqno;
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};
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#ifdef NETSTACK_CONF_MAC_SEQNO_HISTORY
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#define MAX_SEQNOS NETSTACK_CONF_MAC_SEQNO_HISTORY
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#else /* NETSTACK_CONF_MAC_SEQNO_HISTORY */
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#define MAX_SEQNOS 8
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#endif /* NETSTACK_CONF_MAC_SEQNO_HISTORY */
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static struct seqno received_seqnos[MAX_SEQNOS];
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#endif /* NULLRDC_802154_AUTOACK || NULLRDC_802154_AUTOACK_HW */
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/*---------------------------------------------------------------------------*/
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static int
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send_one_packet(mac_callback_t sent, void *ptr)
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{
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int ret;
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int last_sent_ok = 0;
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packetbuf_set_addr(PACKETBUF_ADDR_SENDER, &rimeaddr_node_addr);
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#if NULLRDC_802154_AUTOACK || NULLRDC_802154_AUTOACK_HW
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packetbuf_set_attr(PACKETBUF_ATTR_MAC_ACK, 1);
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#endif /* NULLRDC_802154_AUTOACK || NULLRDC_802154_AUTOACK_HW */
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if(NETSTACK_FRAMER.create() < 0) {
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/* Failed to allocate space for headers */
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PRINTF("nullrdc: send failed, too large header\n");
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ret = MAC_TX_ERR_FATAL;
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} else {
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#ifdef NETSTACK_ENCRYPT
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NETSTACK_ENCRYPT();
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#endif /* NETSTACK_ENCRYPT */
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#if NULLRDC_802154_AUTOACK
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int is_broadcast;
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uint8_t dsn;
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dsn = ((uint8_t *)packetbuf_hdrptr())[2] & 0xff;
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NETSTACK_RADIO.prepare(packetbuf_hdrptr(), packetbuf_totlen());
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is_broadcast = rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
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&rimeaddr_null);
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if(NETSTACK_RADIO.receiving_packet() ||
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(!is_broadcast && NETSTACK_RADIO.pending_packet())) {
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/* Currently receiving a packet over air or the radio has
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already received a packet that needs to be read before
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sending with auto ack. */
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ret = MAC_TX_COLLISION;
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} else {
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if(!is_broadcast) {
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RIMESTATS_ADD(reliabletx);
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}
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switch(NETSTACK_RADIO.transmit(packetbuf_totlen())) {
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case RADIO_TX_OK:
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if(is_broadcast) {
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ret = MAC_TX_OK;
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} else {
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rtimer_clock_t wt;
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/* Check for ack */
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wt = RTIMER_NOW();
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watchdog_periodic();
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while(RTIMER_CLOCK_LT(RTIMER_NOW(), wt + ACK_WAIT_TIME)) {
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#if CONTIKI_TARGET_COOJA
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simProcessRunValue = 1;
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cooja_mt_yield();
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#endif /* CONTIKI_TARGET_COOJA */
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}
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ret = MAC_TX_NOACK;
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if(NETSTACK_RADIO.receiving_packet() ||
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NETSTACK_RADIO.pending_packet() ||
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NETSTACK_RADIO.channel_clear() == 0) {
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int len;
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uint8_t ackbuf[ACK_LEN];
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if(AFTER_ACK_DETECTED_WAIT_TIME > 0) {
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wt = RTIMER_NOW();
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watchdog_periodic();
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while(RTIMER_CLOCK_LT(RTIMER_NOW(),
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wt + AFTER_ACK_DETECTED_WAIT_TIME)) {
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#if CONTIKI_TARGET_COOJA
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simProcessRunValue = 1;
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cooja_mt_yield();
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#endif /* CONTIKI_TARGET_COOJA */
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}
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}
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if(NETSTACK_RADIO.pending_packet()) {
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len = NETSTACK_RADIO.read(ackbuf, ACK_LEN);
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if(len == ACK_LEN && ackbuf[2] == dsn) {
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/* Ack received */
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RIMESTATS_ADD(ackrx);
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ret = MAC_TX_OK;
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} else {
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/* Not an ack or ack not for us: collision */
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ret = MAC_TX_COLLISION;
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}
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}
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} else {
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PRINTF("nullrdc tx noack\n");
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}
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}
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break;
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case RADIO_TX_COLLISION:
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ret = MAC_TX_COLLISION;
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break;
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default:
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ret = MAC_TX_ERR;
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break;
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}
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}
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#else /* ! NULLRDC_802154_AUTOACK */
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switch(NETSTACK_RADIO.send(packetbuf_hdrptr(), packetbuf_totlen())) {
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case RADIO_TX_OK:
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ret = MAC_TX_OK;
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break;
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case RADIO_TX_COLLISION:
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ret = MAC_TX_COLLISION;
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break;
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case RADIO_TX_NOACK:
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ret = MAC_TX_NOACK;
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break;
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default:
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ret = MAC_TX_ERR;
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break;
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}
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#endif /* ! NULLRDC_802154_AUTOACK */
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}
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if(ret == MAC_TX_OK) {
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last_sent_ok = 1;
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}
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mac_call_sent_callback(sent, ptr, ret, 1);
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return last_sent_ok;
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}
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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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send_one_packet(sent, ptr);
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}
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/*---------------------------------------------------------------------------*/
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static void
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send_list(mac_callback_t sent, void *ptr, struct rdc_buf_list *buf_list)
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{
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while(buf_list != NULL) {
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/* We backup the next pointer, as it may be nullified by
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* mac_call_sent_callback() */
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struct rdc_buf_list *next = buf_list->next;
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int last_sent_ok;
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queuebuf_to_packetbuf(buf_list->buf);
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last_sent_ok = send_one_packet(sent, ptr);
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/* If packet transmission was not successful, we should back off and let
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* upper layers retransmit, rather than potentially sending out-of-order
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* packet fragments. */
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if(!last_sent_ok) {
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return;
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}
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buf_list = next;
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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packet_input(void)
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{
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int original_datalen;
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uint8_t *original_dataptr;
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original_datalen = packetbuf_datalen();
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original_dataptr = packetbuf_dataptr();
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#ifdef NETSTACK_DECRYPT
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NETSTACK_DECRYPT();
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#endif /* NETSTACK_DECRYPT */
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#if NULLRDC_802154_AUTOACK
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if(packetbuf_datalen() == ACK_LEN) {
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/* Ignore ack packets */
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PRINTF("nullrdc: ignored ack\n");
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} else
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#endif /* NULLRDC_802154_AUTOACK */
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if(NETSTACK_FRAMER.parse() < 0) {
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PRINTF("nullrdc: failed to parse %u\n", packetbuf_datalen());
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#if NULLRDC_ADDRESS_FILTER
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} else if(!rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
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&rimeaddr_node_addr) &&
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!rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
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&rimeaddr_null)) {
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PRINTF("nullrdc: not for us\n");
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#endif /* NULLRDC_ADDRESS_FILTER */
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} else {
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int duplicate = 0;
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#if NULLRDC_802154_AUTOACK || NULLRDC_802154_AUTOACK_HW
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/* Check for duplicate packet by comparing the sequence number
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of the incoming packet with the last few ones we saw. */
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int i;
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for(i = 0; i < MAX_SEQNOS; ++i) {
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if(packetbuf_attr(PACKETBUF_ATTR_PACKET_ID) == received_seqnos[i].seqno &&
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rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_SENDER),
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&received_seqnos[i].sender)) {
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/* Drop the packet. */
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PRINTF("nullrdc: drop duplicate link layer packet %u\n",
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packetbuf_attr(PACKETBUF_ATTR_PACKET_ID));
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duplicate = 1;
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}
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}
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if(!duplicate) {
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for(i = MAX_SEQNOS - 1; i > 0; --i) {
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memcpy(&received_seqnos[i], &received_seqnos[i - 1],
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sizeof(struct seqno));
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}
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received_seqnos[0].seqno = packetbuf_attr(PACKETBUF_ATTR_PACKET_ID);
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rimeaddr_copy(&received_seqnos[0].sender,
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packetbuf_addr(PACKETBUF_ADDR_SENDER));
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}
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#endif /* NULLRDC_802154_AUTOACK */
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#if NULLRDC_SEND_802154_ACK
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{
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frame802154_t info154;
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frame802154_parse(original_dataptr, original_datalen, &info154);
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if(info154.fcf.frame_type == FRAME802154_DATAFRAME &&
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info154.fcf.ack_required != 0 &&
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rimeaddr_cmp((rimeaddr_t *)&info154.dest_addr,
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&rimeaddr_node_addr)) {
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uint8_t ackdata[ACK_LEN] = {0, 0, 0};
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ackdata[0] = FRAME802154_ACKFRAME;
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ackdata[1] = 0;
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ackdata[2] = info154.seq;
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NETSTACK_RADIO.send(ackdata, ACK_LEN);
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}
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}
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#endif /* NULLRDC_SEND_ACK */
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if(!duplicate) {
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NETSTACK_MAC.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(int keep_radio_on)
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{
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if(keep_radio_on) {
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return NETSTACK_RADIO.on();
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} else {
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return NETSTACK_RADIO.off();
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}
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}
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/*---------------------------------------------------------------------------*/
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static unsigned short
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channel_check_interval(void)
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{
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return 0;
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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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on();
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}
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/*---------------------------------------------------------------------------*/
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const struct rdc_driver nullrdc_driver = {
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"nullrdc",
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init,
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send_packet,
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send_list,
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packet_input,
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on,
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off,
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channel_check_interval,
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};
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/*---------------------------------------------------------------------------*/
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