mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-08-17 13:29:10 +00:00
typedef union uip_ip4addr_t { u16_t u16[2]; u8_t u8[4]; } uip_ip4addr_t; typedef uip_ip4addr_t uip_ipaddr_t; This implies that one must consistently pass pointers to uip_ipaddr_t:s and not mix and match pointers with uip_ipaddr_t:s as was done earlier.
160 lines
4.8 KiB
C
160 lines
4.8 KiB
C
/*
|
|
* 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 1.2 2006/08/09 16:13:40 bg- 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;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|