148 lines
4.1 KiB
C
148 lines
4.1 KiB
C
/*
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* Copyright (c) 2006, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: uaodv-rt.c,v 1.8 2010/10/19 18:29:04 adamdunkels Exp $
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*/
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/**
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* \file
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* Routing tables for the micro implementation of the AODV ad hoc routing protocol
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* \author
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* Adam Dunkels <adam@sics.se>
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*/
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#include "net/uaodv-rt.h"
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#include "contiki-net.h"
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#ifndef UAODV_NUM_RT_ENTRIES
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#define UAODV_NUM_RT_ENTRIES 8
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#endif
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/*
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* LRU (with respect to insertion time) list of route entries.
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*/
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LIST(route_table);
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MEMB(route_mem, struct uaodv_rt_entry, UAODV_NUM_RT_ENTRIES);
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/*---------------------------------------------------------------------------*/
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void
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uaodv_rt_init(void)
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{
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list_init(route_table);
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memb_init(&route_mem);
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}
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/*---------------------------------------------------------------------------*/
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struct uaodv_rt_entry *
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uaodv_rt_add(uip_ipaddr_t *dest, uip_ipaddr_t *nexthop,
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unsigned hop_count, const uint32_t *seqno)
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{
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struct uaodv_rt_entry *e;
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/* Avoid inserting duplicate entries. */
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e = uaodv_rt_lookup_any(dest);
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if(e != NULL) {
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list_remove(route_table, e);
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} else {
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/* Allocate a new entry or reuse the oldest. */
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e = memb_alloc(&route_mem);
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if(e == NULL) {
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e = list_chop(route_table); /* Remove oldest entry. */
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}
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}
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uip_ipaddr_copy(&e->dest, dest);
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uip_ipaddr_copy(&e->nexthop, nexthop);
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e->hop_count = hop_count;
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e->hseqno = uip_ntohl(*seqno);
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e->is_bad = 0;
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/* New entry goes first. */
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list_push(route_table, e);
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return e;
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}
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/*---------------------------------------------------------------------------*/
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struct uaodv_rt_entry *
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uaodv_rt_lookup_any(uip_ipaddr_t *dest)
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{
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struct uaodv_rt_entry *e;
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for(e = list_head(route_table); e != NULL; e = e->next) {
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if(uip_ipaddr_cmp(dest, &e->dest)) {
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return e;
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}
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}
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return NULL;
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}
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struct uaodv_rt_entry *
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uaodv_rt_lookup(uip_ipaddr_t *dest)
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{
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struct uaodv_rt_entry *e;
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e = uaodv_rt_lookup_any(dest);
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if(e != NULL && e->is_bad)
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return NULL;
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return e;
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}
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/*---------------------------------------------------------------------------*/
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#if 0
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void
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uaodv_rt_remove(struct uaodv_rt_entry *e)
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{
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list_remove(route_table, e);
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memb_free(&route_mem, e);
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}
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#endif
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void
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uaodv_rt_lru(struct uaodv_rt_entry *e)
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{
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if(e != list_head(route_table)) {
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list_remove(route_table, e);
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list_push(route_table, e);
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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uaodv_rt_flush_all(void)
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{
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struct uaodv_rt_entry *e;
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while (1) {
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e = list_pop(route_table);
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if(e != NULL)
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memb_free(&route_mem, e);
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else
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break;
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}
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}
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