/*
* Copyright (c) 2008, 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.
*
* $Id: sicslowmac.c,v 1.4 2009/09/18 16:37:17 nifi Exp $
*/
/**
* \file
* MAC interface for packaging radio packets into 802.15.4 frames
*
* \author
* Adam Dunkels <adam@sics.se>
* Eric Gnoske <egnoske@gmail.com>
* Blake Leverett <bleverett@gmail.com>
* Niclas Finne <nfi@sics.se>
* Joakim Eriksson <joakime@sics.se>
*/
#include <string.h>
#include "net/mac/sicslowmac.h"
#include "net/mac/frame802154.h"
#include "net/rime/packetbuf.h"
#include "lib/random.h"
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#define PRINTADDR(addr) PRINTF(" %02x%02x:%02x%02x:%02x%02x:%02x%02x ", ((uint8_t *)addr)[0], ((uint8_t *)addr)[1], ((uint8_t *)addr)[2], ((uint8_t *)addr)[3], ((uint8_t *)addr)[4], ((uint8_t *)addr)[5], ((uint8_t *)addr)[6], ((uint8_t *)addr)[7])
#else
#define PRINTF(...)
#define PRINTADDR(addr)
#endif
/** \brief The sequence number (0x00 - 0xff) added to the transmitted
* data or MAC command frame. The default is a random value within
* the range.
*/
static uint8_t mac_dsn;
/** \brief The 16-bit identifier of the PAN on which the device is
* sending to. If this value is 0xffff, the device is not
* associated.
*/
static uint16_t mac_dst_pan_id = IEEE802154_PANID;
/** \brief The 16-bit identifier of the PAN on which the device is
* operating. If this value is 0xffff, the device is not
* associated.
*/
static uint16_t mac_src_pan_id = IEEE802154_PANID;
static const struct radio_driver *radio;
static void (* receiver_callback)(const struct mac_driver *);
/*---------------------------------------------------------------------------*/
static int
is_broadcast_addr(uint8_t mode, uint8_t *addr)
{
int i = mode == FRAME802154_SHORTADDRMODE ? 2 : 8;
while(i-- > 0) {
if(addr[i] != 0xff) {
return 0;
}
}
return 1;
}
/*---------------------------------------------------------------------------*/
static int
send_packet(void)
{
frame802154_t params;
uint8_t len;
/* init to zeros */
memset(¶ms, 0, sizeof(params));
/* Build the FCF. */
params.fcf.frame_type = FRAME802154_DATAFRAME;
params.fcf.security_enabled = 0;
params.fcf.frame_pending = 0;
params.fcf.ack_required = packetbuf_attr(PACKETBUF_ATTR_RELIABLE);
params.fcf.panid_compression = 0;
/* Insert IEEE 802.15.4 (2003) version bit. */
params.fcf.frame_version = FRAME802154_IEEE802154_2003;
/* Increment and set the data sequence number. */
params.seq = mac_dsn++;
/* Complete the addressing fields. */
/**
\todo For phase 1 the addresses are all long. We'll need a mechanism
in the rime attributes to tell the mac to use long or short for phase 2.
*/
params.fcf.src_addr_mode = FRAME802154_LONGADDRMODE;
params.dest_pid = mac_dst_pan_id;
/*
* If the output address is NULL in the Rime buf, then it is broadcast
* on the 802.15.4 network.
*/
if(rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER), &rimeaddr_null)) {
/* Broadcast requires short address mode. */
params.fcf.dest_addr_mode = FRAME802154_SHORTADDRMODE;
params.dest_addr.u8[0] = 0xFF;
params.dest_addr.u8[1] = 0xFF;
} else {
rimeaddr_copy(¶ms.dest_addr, packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
params.fcf.dest_addr_mode = FRAME802154_LONGADDRMODE;
}
/* Set the source PAN ID to the global variable. */
params.src_pid = mac_src_pan_id;
/*
* Set up the source address using only the long address mode for
* phase 1.
*/
rimeaddr_copy(¶ms.src_addr, &rimeaddr_node_addr);
params.payload = packetbuf_dataptr();
params.payload_len = packetbuf_datalen();
len = frame802154_hdrlen(¶ms);
if(packetbuf_hdralloc(len)) {
frame802154_create(¶ms, packetbuf_hdrptr(), len);
PRINTF("6MAC-UT: %2X", params.fcf.frame_type);
PRINTADDR(params.dest_addr.u8);
PRINTF("%u %u (%u)\n", len, packetbuf_datalen(), packetbuf_totlen());
return radio->send(packetbuf_hdrptr(), packetbuf_totlen());
} else {
PRINTF("6MAC-UT: too large header: %u\n", len);
}
return 0;
}
/*---------------------------------------------------------------------------*/
static void
input_packet(const struct radio_driver *d)
{
if(receiver_callback) {
receiver_callback(&sicslowmac_driver);
}
}
/*---------------------------------------------------------------------------*/
static int
read_packet(void)
{
frame802154_t frame;
int len;
packetbuf_clear();
len = radio->read(packetbuf_dataptr(), PACKETBUF_SIZE);
if(len > 0) {
packetbuf_set_datalen(len);
if(frame802154_parse(packetbuf_dataptr(), len, &frame) &&
packetbuf_hdrreduce(len - frame.payload_len)) {
if(frame.fcf.dest_addr_mode) {
if(frame.dest_pid != mac_src_pan_id &&
frame.dest_pid != FRAME802154_BROADCASTPANDID) {
/* Not broadcast or for our PAN */
PRINTF("6MAC: for another pan %u\n", frame.dest_pid);
return 0;
}
if(!is_broadcast_addr(frame.fcf.dest_addr_mode, frame.dest_addr.u8)) {
packetbuf_set_addr(PACKETBUF_ADDR_RECEIVER, &frame.dest_addr);
if(!rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER),
&rimeaddr_node_addr)) {
/* Not for this node */
PRINTF("6MAC: not for us\n");
return 0;
}
}
}
packetbuf_set_addr(PACKETBUF_ADDR_SENDER, &frame.src_addr);
PRINTF("6MAC-IN: %2X", frame.fcf.frame_type);
PRINTADDR(packetbuf_addr(PACKETBUF_ADDR_SENDER));
PRINTADDR(packetbuf_addr(PACKETBUF_ADDR_RECEIVER));
PRINTF("%u\n", packetbuf_datalen());
return packetbuf_datalen();
} else {
PRINTF("6MAC: failed to parse hdr\n");
}
}
return 0;
}
/*---------------------------------------------------------------------------*/
static void
set_receive_function(void (* recv)(const struct mac_driver *))
{
receiver_callback = recv;
}
/*---------------------------------------------------------------------------*/
static int
on(void)
{
return radio->on();
}
/*---------------------------------------------------------------------------*/
static int
off(int keep_radio_on)
{
if(keep_radio_on) {
return radio->on();
} else {
return radio->off();
}
}
/*---------------------------------------------------------------------------*/
const struct mac_driver sicslowmac_driver = {
"sicslowmac",
sicslowmac_init,
send_packet,
read_packet,
set_receive_function,
on,
off,
};
/*---------------------------------------------------------------------------*/
const struct mac_driver *
sicslowmac_init(const struct radio_driver *d)
{
mac_dsn = random_rand() % 256;
radio = d;
radio->set_receive_function(input_packet);
radio->on();
return &sicslowmac_driver;
}
/*---------------------------------------------------------------------------*/