/* * Copyright (c) 2006, 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: uip-neighbor.c,v 1.3 2008/11/09 12:16:05 adamdunkels Exp $ */ /** * \file * Database of link-local neighbors, used by IPv6 code and * to be used by a future ARP code rewrite. * \author * Adam Dunkels <adam@sics.se> */ #include "net/uip-neighbor.h" #include <string.h> #include <stdio.h> #define MAX_TIME 128 #ifdef UIP_NEIGHBOR_CONF_ENTRIES #define ENTRIES UIP_NEIGHBOR_CONF_ENTRIES #else /* UIP_NEIGHBOR_CONF_ENTRIES */ #define ENTRIES 8 #endif /* UIP_NEIGHBOR_CONF_ENTRIES */ struct neighbor_entry { uip_ipaddr_t ipaddr; struct uip_neighbor_addr addr; u8_t time; }; static struct neighbor_entry entries[ENTRIES]; /*---------------------------------------------------------------------------*/ void uip_neighbor_init(void) { int i; for(i = 0; i < ENTRIES; ++i) { entries[i].time = MAX_TIME; } } /*---------------------------------------------------------------------------*/ void uip_neighbor_periodic(void) { int i; for(i = 0; i < ENTRIES; ++i) { if(entries[i].time < MAX_TIME) { entries[i].time++; } } } /*---------------------------------------------------------------------------*/ void uip_neighbor_add(uip_ipaddr_t *ipaddr, struct uip_neighbor_addr *addr) { int i, oldest; u8_t oldest_time; /* printf("Adding neighbor with link address %02x:%02x:%02x:%02x:%02x:%02x\n", addr->addr.addr[0], addr->addr.addr[1], addr->addr.addr[2], addr->addr.addr[3], addr->addr.addr[4], addr->addr.addr[5]);*/ /* Find the first unused entry or the oldest used entry. */ oldest_time = 0; oldest = 0; for(i = 0; i < ENTRIES; ++i) { if(entries[i].time == MAX_TIME) { oldest = i; break; } if(uip_ipaddr_cmp(&entries[i].ipaddr, ipaddr)) { oldest = i; break; } if(entries[i].time > oldest_time) { oldest = i; oldest_time = entries[i].time; } } /* Use the oldest or first free entry (either pointed to by the "oldest" variable). */ entries[oldest].time = 0; uip_ipaddr_copy(&entries[oldest].ipaddr, ipaddr); memcpy(&entries[oldest].addr, addr, sizeof(struct uip_neighbor_addr)); } /*---------------------------------------------------------------------------*/ static struct neighbor_entry * find_entry(uip_ipaddr_t *ipaddr) { int i; for(i = 0; i < ENTRIES; ++i) { if(uip_ipaddr_cmp(&entries[i].ipaddr, ipaddr)) { return &entries[i]; } } return NULL; } /*---------------------------------------------------------------------------*/ void uip_neighbor_update(uip_ipaddr_t *ipaddr) { struct neighbor_entry *e; e = find_entry(ipaddr); if(e != NULL) { e->time = 0; } } /*---------------------------------------------------------------------------*/ struct uip_neighbor_addr * uip_neighbor_lookup(uip_ipaddr_t *ipaddr) { struct neighbor_entry *e; e = find_entry(ipaddr); if(e != NULL) { /* printf("Lookup neighbor with link address %02x:%02x:%02x:%02x:%02x:%02x\n", e->addr.addr.addr[0], e->addr.addr.addr[1], e->addr.addr.addr[2], e->addr.addr.addr[3], e->addr.addr.addr[4], e->addr.addr.addr[5]);*/ return &e->addr; } return NULL; } /*---------------------------------------------------------------------------*/