nes-proj/core/net/rime/mesh.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
* A mesh routing protocol
* \author
* Adam Dunkels <adam@sics.se>
*/
/**
* \addtogroup rimemesh
* @{
*/
#include "contiki.h"
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#include "net/rime/rime.h"
#include "net/rime/route.h"
#include "net/rime/mesh.h"
#include <stddef.h> /* For offsetof */
#define PACKET_TIMEOUT (CLOCK_SECOND * 10)
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static void
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data_packet_received(struct multihop_conn *multihop,
const linkaddr_t *from,
const linkaddr_t *prevhop, uint8_t hops)
{
struct mesh_conn *c = (struct mesh_conn *)
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((char *)multihop - offsetof(struct mesh_conn, multihop));
struct route_entry *rt;
/* Refresh the route when we hear a packet from a neighbor. */
rt = route_lookup(from);
if(rt != NULL) {
route_refresh(rt);
}
if(c->cb->recv) {
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c->cb->recv(c, from, hops);
}
}
/*---------------------------------------------------------------------------*/
static linkaddr_t *
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data_packet_forward(struct multihop_conn *multihop,
const linkaddr_t *originator,
const linkaddr_t *dest,
const linkaddr_t *prevhop, uint8_t hops)
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{
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struct route_entry *rt;
struct mesh_conn *c = (struct mesh_conn *)
((char *)multihop - offsetof(struct mesh_conn, multihop));
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rt = route_lookup(dest);
if(rt == NULL) {
if(c->queued_data != NULL) {
queuebuf_free(c->queued_data);
}
PRINTF("data_packet_forward: queueing data, sending rreq\n");
c->queued_data = queuebuf_new_from_packetbuf();
linkaddr_copy(&c->queued_data_dest, dest);
route_discovery_discover(&c->route_discovery_conn, dest, PACKET_TIMEOUT);
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return NULL;
} else {
route_refresh(rt);
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}
return &rt->nexthop;
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}
/*---------------------------------------------------------------------------*/
static void
found_route(struct route_discovery_conn *rdc, const linkaddr_t *dest)
{
struct route_entry *rt;
struct mesh_conn *c = (struct mesh_conn *)
((char *)rdc - offsetof(struct mesh_conn, route_discovery_conn));
PRINTF("found_route\n");
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if(c->queued_data != NULL &&
linkaddr_cmp(dest, &c->queued_data_dest)) {
queuebuf_to_packetbuf(c->queued_data);
queuebuf_free(c->queued_data);
c->queued_data = NULL;
rt = route_lookup(dest);
if(rt != NULL) {
multihop_resend(&c->multihop, &rt->nexthop);
if(c->cb->sent != NULL) {
c->cb->sent(c);
}
} else {
if(c->cb->timedout != NULL) {
c->cb->timedout(c);
}
}
}
}
/*---------------------------------------------------------------------------*/
static void
route_timed_out(struct route_discovery_conn *rdc)
{
struct mesh_conn *c = (struct mesh_conn *)
((char *)rdc - offsetof(struct mesh_conn, route_discovery_conn));
if(c->queued_data != NULL) {
queuebuf_free(c->queued_data);
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c->queued_data = NULL;
}
if(c->cb->timedout) {
c->cb->timedout(c);
}
}
/*---------------------------------------------------------------------------*/
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static const struct multihop_callbacks data_callbacks = { data_packet_received,
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data_packet_forward };
static const struct route_discovery_callbacks route_discovery_callbacks =
{ found_route, route_timed_out };
/*---------------------------------------------------------------------------*/
void
mesh_open(struct mesh_conn *c, uint16_t channels,
const struct mesh_callbacks *callbacks)
{
route_init();
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multihop_open(&c->multihop, channels, &data_callbacks);
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route_discovery_open(&c->route_discovery_conn,
CLOCK_SECOND * 2,
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channels + 1,
&route_discovery_callbacks);
c->cb = callbacks;
}
/*---------------------------------------------------------------------------*/
void
mesh_close(struct mesh_conn *c)
{
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multihop_close(&c->multihop);
route_discovery_close(&c->route_discovery_conn);
}
/*---------------------------------------------------------------------------*/
int
mesh_send(struct mesh_conn *c, const linkaddr_t *to)
{
int could_send;
PRINTF("%d.%d: mesh_send to %d.%d\n",
linkaddr_node_addr.u8[0], linkaddr_node_addr.u8[1],
to->u8[0], to->u8[1]);
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could_send = multihop_send(&c->multihop, to);
if(!could_send) {
PRINTF("mesh_send: could not send\n");
return 0;
}
if(c->cb->sent != NULL) {
c->cb->sent(c);
}
return 1;
}
/*---------------------------------------------------------------------------*/
int
mesh_ready(struct mesh_conn *c)
{
return (c->queued_data == NULL);
}
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/** @} */