nes-proj/core/net/rime/rmh.c

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/*
* Copyright (c) 2007, 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
* Multihop forwarding
* \author
* Adam Dunkels <adam@sics.se>
*/
/**
* \addtogroup rimermh
* @{
*/
#include "contiki.h"
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#include "net/rime/rime.h"
#include "net/rime/rmh.h"
struct data_hdr {
linkaddr_t dest;
linkaddr_t originator;
uint8_t hops;
uint8_t max_rexmits;
};
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static void
received(struct runicast_conn *uc, const linkaddr_t *from, uint8_t seqno)
{
struct rmh_conn *c = (struct rmh_conn *)uc;
struct data_hdr *msg = packetbuf_dataptr();
linkaddr_t *nexthop;
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PRINTF("data_packet_received from %d.%d towards %d.%d len %d\n",
from->u8[0], from->u8[1],
msg->dest.u8[0], msg->dest.u8[1],
packetbuf_datalen());
if(linkaddr_cmp(&msg->dest, &linkaddr_node_addr)) {
PRINTF("for us!\n");
packetbuf_hdrreduce(sizeof(struct data_hdr));
if(c->cb->recv) {
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c->cb->recv(c, &msg->originator, msg->hops);
}
} else {
nexthop = NULL;
if(c->cb->forward) {
nexthop = c->cb->forward(c, &msg->originator,
&msg->dest, from, msg->hops);
}
if(nexthop) {
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PRINTF("forwarding to %d.%d\n", nexthop->u8[0], nexthop->u8[1]);
msg->hops++;
runicast_send(&c->c, nexthop, c->num_rexmit);
}
}
}
/*---------------------------------------------------------------------------*/
static void
sent(struct runicast_conn *c, const linkaddr_t *to, uint8_t retransmissions)
{
}
/*---------------------------------------------------------------------------*/
static void
timedout(struct runicast_conn *c, const linkaddr_t *to, uint8_t retransmissions)
{
}
/*---------------------------------------------------------------------------*/
static const struct runicast_callbacks data_callbacks = { received ,
sent,
timedout};
/*---------------------------------------------------------------------------*/
void
rmh_open(struct rmh_conn *c, uint16_t channel,
const struct rmh_callbacks *callbacks)
{
runicast_open(&c->c, channel, &data_callbacks);
c->cb = callbacks;
}
/*---------------------------------------------------------------------------*/
void
rmh_close(struct rmh_conn *c)
{
runicast_close(&c->c);
}
/*---------------------------------------------------------------------------*/
int
rmh_send(struct rmh_conn *c, linkaddr_t *to, uint8_t num_rexmit, uint8_t max_hops)
{
linkaddr_t *nexthop;
struct data_hdr *hdr;
c->num_rexmit = num_rexmit;
if(c->cb->forward == NULL) {
return 0;
}
nexthop = c->cb->forward(c, &linkaddr_node_addr, to, NULL, 0);
if(nexthop == NULL) {
PRINTF("rmh_send: no route\n");
return 0;
} else {
PRINTF("rmh_send: sending data\n");
if(packetbuf_hdralloc(sizeof(struct data_hdr))) {
hdr = packetbuf_hdrptr();
linkaddr_copy(&hdr->dest, to);
linkaddr_copy(&hdr->originator, &linkaddr_node_addr);
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hdr->hops = 1;
hdr->max_rexmits = num_rexmit;
runicast_send(&c->c, nexthop, num_rexmit);
}
return 1;
}
}
/*---------------------------------------------------------------------------*/
/** @} */