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osd-contiki/core/net/rime/route-discovery.c

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/**
* \addtogroup routediscovery
* @{
*/
/*
* 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.
*
* $Id: route-discovery.c,v 1.10 2008/06/26 11:19:22 adamdunkels Exp $
*/
/**
* \file
* Route discovery protocol
* \author
* Adam Dunkels <adam@sics.se>
*/
#include "contiki.h"
#include "net/rime.h"
#include "net/rime/route.h"
#include "net/rime/route-discovery.h"
#include <stddef.h> /* For offsetof */
struct route_msg {
rimeaddr_t dest;
uint8_t rreq_id;
uint8_t pad;
};
struct rrep_hdr {
uint8_t rreq_id;
uint8_t hops;
rimeaddr_t dest;
rimeaddr_t originator;
};
#if NETSIM
#include "ether.h"
#endif
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
static void
send_rreq(struct route_discovery_conn *c, rimeaddr_t *dest)
{
struct route_msg *msg;
rimebuf_clear();
msg = rimebuf_dataptr();
rimebuf_set_datalen(sizeof(struct route_msg));
msg->pad = 0;
msg->rreq_id = c->rreq_id;
rimeaddr_copy(&msg->dest, dest);
nf_send(&c->rreqconn, c->rreq_id);
c->rreq_id++;
}
/*---------------------------------------------------------------------------*/
static void
send_rrep(struct route_discovery_conn *c, rimeaddr_t *dest)
{
struct rrep_hdr *rrepmsg;
struct route_entry *rt;
rimebuf_clear();
rrepmsg = rimebuf_dataptr();
rimebuf_set_datalen(sizeof(struct rrep_hdr));
rrepmsg->hops = 0;
rimeaddr_copy(&rrepmsg->dest, dest);
rimeaddr_copy(&rrepmsg->originator, &rimeaddr_node_addr);
rt = route_lookup(dest);
if(rt != NULL) {
PRINTF("%d.%d: send_rrep to %d.%d via %d.%d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
dest->u8[0],dest->u8[1],
rt->nexthop.u8[0],rt->nexthop.u8[1]);
unicast_send(&c->rrepconn, &rt->nexthop);
}
}
/*---------------------------------------------------------------------------*/
static void
insert_route(rimeaddr_t *originator, rimeaddr_t *last_hop, uint8_t hops)
{
struct route_entry *rt;
rt = route_lookup(originator);
if(rt == NULL || hops < rt->hop_count) {
PRINTF("%d.%d: Inserting %d.%d into routing table, next hop %d.%d, hop count %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
originator->u8[0], originator->u8[1],
last_hop->u8[0], last_hop->u8[1],
hops);
route_add(originator, last_hop, hops, 0);
#if NETSIM
ether_set_line(last_hop->u8[0], last_hop->u8[1]);
#endif
}
}
/*---------------------------------------------------------------------------*/
static void
rrep_packet_received(struct unicast_conn *uc, rimeaddr_t *from)
{
struct rrep_hdr *msg = rimebuf_dataptr();
struct route_entry *rt;
rimeaddr_t dest;
struct route_discovery_conn *c = (struct route_discovery_conn *)
((char *)uc - offsetof(struct route_discovery_conn, rrepconn));
PRINTF("%d.%d: rrep_packet_received from %d.%d towards %d.%d len %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
from->u8[0],from->u8[1],
msg->dest.u8[0],msg->dest.u8[1],
rimebuf_datalen());
insert_route(&msg->originator, from, msg->hops);
if(rimeaddr_cmp(&msg->dest, &rimeaddr_node_addr)) {
PRINTF("rrep for us!\n");
if(c->cb->new_route) {
c->cb->new_route(c, &msg->originator);
}
} else {
rimeaddr_copy(&dest, &msg->dest);
rt = route_lookup(&msg->dest);
if(rt != NULL) {
PRINTF("forwarding to %d\n", rt->nexthop.u16[0]);
msg->hops++;
unicast_send(&c->rrepconn, &rt->nexthop);
} else {
PRINTF("%d: no route to %d\n", rimeaddr_node_addr.u16[0], msg->dest.u16[0]);
}
}
}
/*---------------------------------------------------------------------------*/
static int
rreq_packet_received(struct nf_conn *nf, rimeaddr_t *from,
rimeaddr_t *originator, uint8_t seqno, uint8_t hops)
{
struct route_msg *msg = rimebuf_dataptr();
struct route_discovery_conn *c = (struct route_discovery_conn *)
((char *)nf - offsetof(struct route_discovery_conn, rreqconn));
PRINTF("%d.%d: rreq_packet_received from %d.%d hops %d rreq_id %d last %d/%d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
from->u8[0], from->u8[1],
hops, msg->rreq_id,
c->last_rreq_originator.u16[0],
c->last_rreq_id);
if(!(rimeaddr_cmp(&c->last_rreq_originator, originator) &&
c->last_rreq_id == msg->rreq_id)) {
PRINTF("%d.%d: rreq_packet_received: request for %d.%d originator %d.%d / %d\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1],
msg->dest.u8[0], msg->dest.u8[1],
originator->u8[0], originator->u8[1],
msg->rreq_id);
rimeaddr_copy(&c->last_rreq_originator, originator);
c->last_rreq_id = msg->rreq_id;
if(rimeaddr_cmp(&msg->dest, &rimeaddr_node_addr)) {
PRINTF("%d.%d: route_packet_received: route request for our address\n",
rimeaddr_node_addr.u8[0], rimeaddr_node_addr.u8[1]);
insert_route(originator, from, hops);
/* Send route reply back to source. */
send_rrep(c, originator);
return 0; /* Don't continue to flood the rreq packet. */
} else {
/* PRINTF("route request for %d\n", msg->dest_id);*/
insert_route(originator, from, hops);
}
return 1;
}
return 0; /* Don't forward packet. */
}
/*---------------------------------------------------------------------------*/
static const struct unicast_callbacks rrep_callbacks = {rrep_packet_received};
static const struct nf_callbacks rreq_callbacks = {rreq_packet_received, NULL, NULL};
/*---------------------------------------------------------------------------*/
void
route_discovery_open(struct route_discovery_conn *c,
clock_time_t time,
uint16_t channels,
const struct route_discovery_callbacks *callbacks)
{
nf_open(&c->rreqconn, time, channels + 0, &rreq_callbacks);
unicast_open(&c->rrepconn, channels + 1, &rrep_callbacks);
c->cb = callbacks;
}
/*---------------------------------------------------------------------------*/
void
route_discovery_close(struct route_discovery_conn *c)
{
unicast_close(&c->rrepconn);
nf_close(&c->rreqconn);
ctimer_stop(&c->t);
}
/*---------------------------------------------------------------------------*/
static void
timeout_handler(void *ptr)
{
struct route_discovery_conn *c = ptr;
PRINTF("route_discovery: timeout, timed out\n");
if(c->cb->timedout) {
c->cb->timedout(c);
}
}
/*---------------------------------------------------------------------------*/
void
route_discovery_discover(struct route_discovery_conn *c, rimeaddr_t *addr,
clock_time_t timeout)
{
PRINTF("route_discovery_send: sending route request\n");
ctimer_set(&c->t, timeout, timeout_handler, c);
send_rreq(c, addr);
}
/*---------------------------------------------------------------------------*/
/** @} */
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