147 lines
4.8 KiB
C
147 lines
4.8 KiB
C
/*
|
|
* Copyright (c) 2010, Swedish Institute of Computer Science.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* This file is part of the Contiki operating system.
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* The 802.15.4 standard CSMA protocol (nonbeacon-enabled)
|
|
* \author
|
|
* Adam Dunkels <adam@sics.se>
|
|
* Simon Duquennoy <simon.duquennoy@inria.fr>
|
|
*/
|
|
|
|
#include "net/mac/csma/csma.h"
|
|
#include "net/mac/csma/csma-output.h"
|
|
#include "net/mac/mac-sequence.h"
|
|
#include "net/packetbuf.h"
|
|
#include "net/netstack.h"
|
|
|
|
/* Log configuration */
|
|
#include "sys/log.h"
|
|
#define LOG_MODULE "CSMA"
|
|
#define LOG_LEVEL LOG_LEVEL_MAC
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
send_packet(mac_callback_t sent, void *ptr)
|
|
{
|
|
csma_output_packet(sent, ptr);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
input_packet(void)
|
|
{
|
|
#if CSMA_SEND_SOFT_ACK
|
|
int original_datalen;
|
|
uint8_t *original_dataptr;
|
|
|
|
original_datalen = packetbuf_datalen();
|
|
original_dataptr = packetbuf_dataptr();
|
|
#endif
|
|
|
|
if(packetbuf_datalen() == CSMA_ACK_LEN) {
|
|
/* Ignore ack packets */
|
|
LOG_DBG("ignored ack\n");
|
|
} else if(NETSTACK_FRAMER.parse() < 0) {
|
|
LOG_ERR("failed to parse %u\n", packetbuf_datalen());
|
|
} else if(!linkaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
|
|
&linkaddr_node_addr) &&
|
|
!packetbuf_holds_broadcast()) {
|
|
LOG_WARN("not for us\n");
|
|
} else {
|
|
int duplicate = 0;
|
|
|
|
/* Check for duplicate packet. */
|
|
duplicate = mac_sequence_is_duplicate();
|
|
if(duplicate) {
|
|
/* Drop the packet. */
|
|
LOG_WARN("drop duplicate link layer packet from ");
|
|
LOG_WARN_LLADDR(packetbuf_addr(PACKETBUF_ADDR_SENDER));
|
|
LOG_WARN_(", seqno %u\n", packetbuf_attr(PACKETBUF_ATTR_MAC_SEQNO));
|
|
} else {
|
|
mac_sequence_register_seqno();
|
|
}
|
|
|
|
#if CSMA_SEND_SOFT_ACK
|
|
{
|
|
frame802154_t info154;
|
|
frame802154_parse(original_dataptr, original_datalen, &info154);
|
|
if(info154.fcf.frame_type == FRAME802154_DATAFRAME &&
|
|
info154.fcf.ack_required != 0 &&
|
|
linkaddr_cmp((linkaddr_t *)&info154.dest_addr,
|
|
&linkaddr_node_addr)) {
|
|
uint8_t ackdata[CSMA_ACK_LEN] = {0, 0, 0};
|
|
|
|
ackdata[0] = FRAME802154_ACKFRAME;
|
|
ackdata[1] = 0;
|
|
ackdata[2] = info154.seq;
|
|
NETSTACK_RADIO.send(ackdata, CSMA_ACK_LEN);
|
|
}
|
|
}
|
|
#endif /* CSMA_SEND_SOFT_ACK */
|
|
if(!duplicate) {
|
|
LOG_WARN("received packet from ");
|
|
LOG_WARN_LLADDR(packetbuf_addr(PACKETBUF_ADDR_SENDER));
|
|
LOG_WARN_(", seqno %u, len %u\n", packetbuf_attr(PACKETBUF_ATTR_MAC_SEQNO), packetbuf_datalen());
|
|
NETSTACK_NETWORK.input();
|
|
}
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
on(void)
|
|
{
|
|
return NETSTACK_RADIO.on();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static int
|
|
off(void)
|
|
{
|
|
return NETSTACK_RADIO.off();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
init(void)
|
|
{
|
|
csma_output_init();
|
|
on();
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
const struct mac_driver csma_driver = {
|
|
"CSMA",
|
|
init,
|
|
send_packet,
|
|
input_packet,
|
|
on,
|
|
off
|
|
};
|
|
/*---------------------------------------------------------------------------*/
|