nes-proj/core/net/neighbor-attr.c

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/*
* Copyright (c) 2010, Vrije Universiteit Brussel
* 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.
*
*
* Author: Joris Borms <joris.borms@vub.ac.be>
*
*/
#include "contiki.h"
#include "lib/memb.h"
#include "lib/list.h"
#include <stddef.h>
#include <string.h>
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#include "net/neighbor-attr.h"
#define DEBUG 0
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
static uint16_t timeout = 0;
MEMB(neighbor_addr_mem, struct neighbor_addr, MAX_NEIGHBORS);
LIST(neighbor_addrs);
LIST(neighbor_attrs);
/*---------------------------------------------------------------------------*/
static struct neighbor_addr *
neighbor_addr_get(const rimeaddr_t *addr)
{
struct neighbor_addr *item;
/* check if addr is derived from table, inside memb */
if(memb_inmemb(&neighbor_addr_mem, (char *)addr)) {
return (struct neighbor_addr *)
(((char *)addr) - offsetof(struct neighbor_addr, addr));
}
item = list_head(neighbor_addrs);
while(item != NULL) {
if(rimeaddr_cmp(addr, &item->addr)) {
return item;
}
item = item->next;
}
return NULL;
}
/*---------------------------------------------------------------------------*/
struct neighbor_addr *
neighbor_attr_list_neighbors(void)
{
return list_head(neighbor_addrs);
}
/*---------------------------------------------------------------------------*/
static void
set_attr(struct neighbor_attr *attr, uint16_t index)
{
if(attr->default_value != NULL) {
memcpy((char *)attr->data + index * attr->size,
attr->default_value, attr->size);
} else {
/* fill with zeroes */
memset((char *)attr->data + index * attr->size, 0, attr->size);
}
}
/*---------------------------------------------------------------------------*/
int
neighbor_attr_register(struct neighbor_attr *def)
{
struct neighbor_addr *addr;
list_push(neighbor_attrs, def);
/* set default values for already existing neighbors */
for(addr = list_head(neighbor_addrs); addr != NULL; addr = addr->next) {
set_attr(def, addr->index);
}
return 1;
}
/*---------------------------------------------------------------------------*/
int
neighbor_attr_has_neighbor(const rimeaddr_t *addr)
{
return neighbor_addr_get(addr) != NULL;
}
/*---------------------------------------------------------------------------*/
int
neighbor_attr_add_neighbor(const rimeaddr_t *addr)
{
struct neighbor_attr *def;
struct neighbor_addr *item;
struct neighbor_addr *ptr;
uint16_t i;
if(neighbor_attr_has_neighbor(addr)) {
return 0;
}
item = memb_alloc(&neighbor_addr_mem);
if(item == NULL) {
return -1;
}
list_push(neighbor_addrs, item);
item->time = 0;
rimeaddr_copy(&item->addr, addr);
/* look up index and set default values */
ptr = neighbor_addr_mem.mem;
for(i = 0; i < neighbor_addr_mem.num; ++i) {
if(&ptr[i] == item) {
break;
}
}
item->index = i;
for(def = list_head(neighbor_attrs); def != NULL; def = def->next) {
set_attr(def, i);
}
return 1;
}
/*---------------------------------------------------------------------------*/
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int
neighbor_attr_remove_neighbor(const rimeaddr_t *addr)
{
struct neighbor_addr *item = neighbor_addr_get(addr);
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if(item != NULL) {
list_remove(neighbor_addrs, item);
memb_free(&neighbor_addr_mem, item);
return 0;
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}
return -1;
}
/*---------------------------------------------------------------------------*/
void *
neighbor_attr_get_data(struct neighbor_attr *def, const rimeaddr_t *addr)
{
struct neighbor_addr *attr = neighbor_addr_get(addr);
if(attr != NULL) {
return (char *)def->data + attr->index * def->size;
}
return NULL;
}
/*---------------------------------------------------------------------------*/
int
neighbor_attr_set_data(struct neighbor_attr *def, const rimeaddr_t *addr,
void *data)
{
struct neighbor_addr *attr = neighbor_addr_get(addr);
if(attr == NULL) {
if(neighbor_attr_add_neighbor(addr)) {
attr = neighbor_addr_get(addr);
}
}
if(attr != NULL) {
attr->time = 0;
memcpy((char *)def->data + attr->index * def->size, data, def->size);
return 1;
}
return 0;
}
/*---------------------------------------------------------------------------*/
void
neighbor_attr_tick(const rimeaddr_t * addr)
{
struct neighbor_addr *attr = neighbor_addr_get(addr);
if(attr != NULL) {
attr->time = 0;
}
}
/*---------------------------------------------------------------------------*/
uint16_t
neighbor_attr_get_timeout(void)
{
return timeout;
}
/*---------------------------------------------------------------------------*/
static struct ctimer ct;
#define TIMEOUT_SECONDS 5
static void
timeout_check(void *ptr)
{
if(timeout > 0) {
struct neighbor_addr *item = neighbor_attr_list_neighbors();
while(item != NULL) {
item->time += TIMEOUT_SECONDS;
if(item->time >= timeout) {
struct neighbor_addr *next_item = item->next;
list_remove(neighbor_addrs, item);
memb_free(&neighbor_addr_mem, item);
item = next_item;
} else {
item = item->next;
}
}
ctimer_set(&ct, TIMEOUT_SECONDS * CLOCK_SECOND, timeout_check, ptr);
}
}
/*---------------------------------------------------------------------------*/
void
neighbor_attr_set_timeout(uint16_t time)
{
if(timeout == 0 && time > 0) {
ctimer_set(&ct, TIMEOUT_SECONDS * CLOCK_SECOND, timeout_check, NULL);
} else if(timeout > 0 && time == 0) {
ctimer_stop(&ct);
}
timeout = time;
}
/*---------------------------------------------------------------------------*/