nhdp_address.c
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/*
* Copyright (C) 2014 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup nhdp
* @{
*
* @file
* @brief Centralized address storage implementation for NHDP
*
* @author Fabian Nack <nack@inf.fu-berlin.de>
*
* @}
*/
#include "mutex.h"
#include "utlist.h"
#include "nhdp.h"
#include "nhdp_address.h"
/* Internal variables */
static mutex_t mtx_addr_access = MUTEX_INIT;
static nhdp_addr_t *nhdp_addr_db_head = NULL;
/*---------------------------------------------------------------------------*
* Centralized Address Storage API *
*---------------------------------------------------------------------------*/
nhdp_addr_t *nhdp_addr_db_get_address(uint8_t *addr, size_t addr_size, uint8_t addr_type)
{
nhdp_addr_t *addr_elt;
mutex_lock(&mtx_addr_access);
LL_FOREACH(nhdp_addr_db_head, addr_elt) {
if ((addr_elt->addr_size == addr_size) && (addr_elt->addr_type == addr_type)) {
if (memcmp(addr_elt->addr, addr, addr_size) == 0) {
/* Found a matching entry */
break;
}
}
}
if (!addr_elt) {
/* No matching entry, create a new one */
addr_elt = (nhdp_addr_t *) malloc(sizeof(nhdp_addr_t));
if (!addr_elt) {
/* Insufficient memory */
return NULL;
}
/* Allocate space for the address */
addr_elt->addr = (uint8_t *) malloc(addr_size * sizeof(uint8_t));
if (!addr_elt->addr) {
/* Insufficient memory */
free(addr_elt);
return NULL;
}
memcpy(addr_elt->addr, addr, addr_size);
addr_elt->addr_size = addr_size;
addr_elt->addr_type = addr_type;
addr_elt->usg_count = 0;
addr_elt->in_tmp_table = NHDP_ADDR_TMP_NONE;
addr_elt->tmp_metric_val = NHDP_METRIC_UNKNOWN;
LL_PREPEND(nhdp_addr_db_head, addr_elt);
}
addr_elt->usg_count++;
mutex_unlock(&mtx_addr_access);
return addr_elt;
}
void nhdp_decrement_addr_usage(nhdp_addr_t *addr)
{
mutex_lock(&mtx_addr_access);
/* Decrement usage count and delete address if no longer used */
if (addr) {
addr->usg_count--;
if (addr->usg_count == 0) {
/* Free address space if address is no longer used */
LL_DELETE(nhdp_addr_db_head, addr);
free(addr->addr);
free(addr);
}
}
mutex_unlock(&mtx_addr_access);
}
void nhdp_free_addr_list(nhdp_addr_entry_t *list_head)
{
nhdp_addr_entry_t *list_elt, *list_tmp;
LL_FOREACH_SAFE(list_head, list_elt, list_tmp) {
nhdp_free_addr_entry(list_elt);
}
}
void nhdp_free_addr_entry(nhdp_addr_entry_t *addr_entry)
{
nhdp_decrement_addr_usage(addr_entry->address);
free(addr_entry);
}
nhdp_addr_entry_t *nhdp_generate_addr_list_from_tmp(uint8_t tmp_type)
{
nhdp_addr_entry_t *new_list_head;
nhdp_addr_t *addr_elt;
new_list_head = NULL;
LL_FOREACH(nhdp_addr_db_head, addr_elt) {
if (addr_elt->in_tmp_table & tmp_type) {
nhdp_addr_entry_t *new_entry = (nhdp_addr_entry_t *) malloc(sizeof(nhdp_addr_entry_t));
if (!new_entry) {
/* Insufficient memory, free all previously allocated memory */
nhdp_free_addr_list(new_list_head);
return NULL;
}
new_entry->address = addr_elt;
/* Increment usage counter of address in central NHDP address storage */
addr_elt->usg_count++;
LL_PREPEND(new_list_head, new_entry);
}
}
return new_list_head;
}
void nhdp_reset_addresses_tmp_usg(uint8_t decr_usg)
{
nhdp_addr_t *addr_elt, *addr_tmp;
LL_FOREACH_SAFE(nhdp_addr_db_head, addr_elt, addr_tmp) {
addr_elt->tmp_metric_val = NHDP_METRIC_UNKNOWN;
if (addr_elt->in_tmp_table) {
addr_elt->in_tmp_table = NHDP_ADDR_TMP_NONE;
if (decr_usg) {
nhdp_decrement_addr_usage(addr_elt);
}
}
}
}
nhdp_addr_t *nhdp_get_addr_db_head(void)
{
return nhdp_addr_db_head;
}