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

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/**
* \addtogroup rimeroute
* @{
*/
/*
* 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.c,v 1.12 2008/02/24 22:05:27 adamdunkels Exp $
*/
/**
* \file
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* Rime route table
* \author
* Adam Dunkels <adam@sics.se>
*/
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#include <stdio.h>
#include "lib/list.h"
#include "lib/memb.h"
#include "net/rime/ctimer.h"
#include "net/rime/route.h"
#include "contiki-conf.h"
#ifdef ROUTE_CONF_ENTRIES
#define NUM_RT_ENTRIES ROUTE_CONF_ENTRIES
#else /* ROUTE_CONF_ENTRIES */
#define NUM_RT_ENTRIES 8
#endif /* ROUTE_CONF_ENTRIES */
/*
* LRU (with respect to insertion time) list of route entries.
*/
LIST(route_table);
MEMB(route_mem, struct route_entry, NUM_RT_ENTRIES);
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static struct ctimer t;
static int max_time = 60;
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/*---------------------------------------------------------------------------*/
static void
periodic(void *ptr)
{
struct route_entry *e;
for(e = list_head(route_table); e != NULL; e = e->next) {
e->time++;
if(e->time >= max_time) {
/* printf("Route to %d.%d dropped\n",
e->dest.u8[0], e->dest.u8[1]);*/
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list_remove(route_table, e);
memb_free(&route_mem, e);
}
}
ctimer_set(&t, CLOCK_SECOND, periodic, NULL);
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}
/*---------------------------------------------------------------------------*/
void
route_init(void)
{
list_init(route_table);
memb_init(&route_mem);
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ctimer_set(&t, CLOCK_SECOND, periodic, NULL);
}
/*---------------------------------------------------------------------------*/
int
route_add(rimeaddr_t *dest, rimeaddr_t *nexthop,
uint8_t hop_count, uint8_t seqno)
{
struct route_entry *e;
/* Avoid inserting duplicate entries. */
e = route_lookup(dest);
if(e != NULL) {
list_remove(route_table, e);
} else {
/* Allocate a new entry or reuse the oldest. */
e = memb_alloc(&route_mem);
if(e == NULL) {
e = list_chop(route_table); /* Remove oldest entry. */
}
}
rimeaddr_copy(&e->dest, dest);
rimeaddr_copy(&e->nexthop, nexthop);
e->hop_count = hop_count;
e->seqno = seqno;
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e->time = 0;
/* New entry goes first. */
list_push(route_table, e);
return 0;
}
/*---------------------------------------------------------------------------*/
struct route_entry *
route_lookup(rimeaddr_t *dest)
{
struct route_entry *e;
for(e = list_head(route_table); e != NULL; e = e->next) {
/* printf("route_lookup: comparing %d.%d.%d.%d with %d.%d.%d.%d\n",
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uip_ipaddr_to_quad(dest), uip_ipaddr_to_quad(&e->dest));*/
if(rimeaddr_cmp(dest, &e->dest)) {
/* Refresh age of route so that used routes do not get thrown
out. */
e->time = 0;
return e;
}
}
return NULL;
}
/*---------------------------------------------------------------------------*/
void
route_remove(struct route_entry *e)
{
list_remove(route_table, e);
memb_free(&route_mem, e);
}
/*---------------------------------------------------------------------------*/
void
route_flush_all(void)
{
struct route_entry *e;
while(1) {
e = list_pop(route_table);
if(e != NULL) {
memb_free(&route_mem, e);
} else {
break;
}
}
}
/*---------------------------------------------------------------------------*/
void
route_set_lifetime(int seconds)
{
max_time = seconds;
}
/*---------------------------------------------------------------------------*/
int
route_num(void)
{
struct route_entry *e;
int i = 0;
for(e = list_head(route_table); e != NULL; e = e->next) {
i++;
}
return i;
}
/*---------------------------------------------------------------------------*/
struct route_entry *
route_get(int num)
{
struct route_entry *e;
int i = 0;
for(e = list_head(route_table); e != NULL; e = e->next) {
if(i == num) {
return e;
}
i++;
}
return NULL;
}
/*---------------------------------------------------------------------------*/
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/** @} */