nes-proj/examples/rpl-border-router/native/border-router-mac.c

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/*
* Copyright (c) 2011, 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.
*/
/**
* \file
* A null RDC implementation that uses framer for headers and sends
* the packets over slip instead of radio.
* \author
* Adam Dunkels <adam@sics.se>
* Joakim Eriksson <joakime@sics.se>
* Niclas Finne <nfi@sics.se>
*/
#include "net/packetbuf.h"
#include "net/queuebuf.h"
#include "net/netstack.h"
#include "packetutils.h"
#include "border-router.h"
#include <string.h>
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
#define MAX_CALLBACKS 16
static int callback_pos;
/* a structure for calling back when packet data is coming back
from radio... */
struct tx_callback {
mac_callback_t cback;
void *ptr;
struct packetbuf_attr attrs[PACKETBUF_NUM_ATTRS];
struct packetbuf_addr addrs[PACKETBUF_NUM_ADDRS];
};
static struct tx_callback callbacks[MAX_CALLBACKS];
/*---------------------------------------------------------------------------*/
void
packet_sent(uint8_t sessionid, uint8_t status, uint8_t tx)
{
if(sessionid < MAX_CALLBACKS) {
struct tx_callback *callback;
callback = &callbacks[sessionid];
packetbuf_clear();
packetbuf_attr_copyfrom(callback->attrs, callback->addrs);
mac_call_sent_callback(callback->cback, callback->ptr, status, tx);
} else {
PRINTF("*** ERROR: too high session id %d\n", sessionid);
}
}
/*---------------------------------------------------------------------------*/
static int
setup_callback(mac_callback_t sent, void *ptr)
{
struct tx_callback *callback;
int tmp = callback_pos;
callback = &callbacks[callback_pos];
callback->cback = sent;
callback->ptr = ptr;
packetbuf_attr_copyto(callback->attrs, callback->addrs);
callback_pos++;
if(callback_pos >= MAX_CALLBACKS) {
callback_pos = 0;
}
return tmp;
}
/*---------------------------------------------------------------------------*/
static void
send_packet(mac_callback_t sent, void *ptr)
{
int size;
/* 3 bytes per packet attribute is required for serialization */
uint8_t buf[PACKETBUF_NUM_ATTRS * 3 + PACKETBUF_SIZE + 3];
uint8_t sid;
packetbuf_set_addr(PACKETBUF_ADDR_SENDER, &linkaddr_node_addr);
/* ack or not ? */
packetbuf_set_attr(PACKETBUF_ATTR_MAC_ACK, 1);
if(NETSTACK_FRAMER.create() < 0) {
/* Failed to allocate space for headers */
PRINTF("br-rdc: send failed, too large header\n");
mac_call_sent_callback(sent, ptr, MAC_TX_ERR_FATAL, 1);
} else {
/* here we send the data over SLIP to the radio-chip */
size = 0;
#if SERIALIZE_ATTRIBUTES
size = packetutils_serialize_atts(&buf[3], sizeof(buf) - 3);
#endif
if(size < 0 || size + packetbuf_totlen() + 3 > sizeof(buf)) {
PRINTF("br-rdc: send failed, too large header\n");
mac_call_sent_callback(sent, ptr, MAC_TX_ERR_FATAL, 1);
} else {
sid = setup_callback(sent, ptr);
buf[0] = '!';
buf[1] = 'S';
buf[2] = sid; /* sequence or session number for this packet */
/* Copy packet data */
memcpy(&buf[3 + size], packetbuf_hdrptr(), packetbuf_totlen());
write_to_slip(buf, packetbuf_totlen() + size + 3);
}
}
}
/*---------------------------------------------------------------------------*/
static void
packet_input(void)
{
if(NETSTACK_FRAMER.parse() < 0) {
PRINTF("br-rdc: failed to parse %u\n", packetbuf_datalen());
} else {
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NETSTACK_NETWORK.input();
}
}
/*---------------------------------------------------------------------------*/
static int
on(void)
{
return 1;
}
/*---------------------------------------------------------------------------*/
static int
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off()
{
return 1;
}
/*---------------------------------------------------------------------------*/
static void
init(void)
{
callback_pos = 0;
}
/*---------------------------------------------------------------------------*/
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const struct mac_driver border_router_mac_driver = {
"br-mac",
init,
send_packet,
packet_input,
on,
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off
};
/*---------------------------------------------------------------------------*/