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/*
* Copyright (C) 2014 Freie Universitรคt 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 Local Information Base implementation for NHDP
*
* @author Fabian Nack <nack@inf.fu-berlin.de>
*
* @}
*/
#include "mutex.h"
#include "utlist.h"
#include "kernel_types.h"
#include "rfc5444/rfc5444_iana.h"
#include "rfc5444/rfc5444_writer.h"
#include "lib_table.h"
#include "nhdp_address.h"
#include "nhdp_writer.h"
/* Internal variables */
static mutex_t mtx_lib_access = MUTEX_INIT;
static lib_entry_t *lib_entry_head = NULL;
/* Internal function prototypes */
static int create_if_entry(kernel_pid_t if_pid, nhdp_addr_t *addr);
static int add_address_to_if(lib_entry_t *if_entry, nhdp_addr_t *addr);
/*---------------------------------------------------------------------------*
* Local Information Base API *
*---------------------------------------------------------------------------*/
int lib_add_if_addr(kernel_pid_t if_pid, nhdp_addr_t *addr)
{
lib_entry_t *lib_elt;
nhdp_addr_entry_t *addr_elt;
int result = -1;
mutex_lock(&mtx_lib_access);
/* Check whether the given interface is already registered */
LL_FOREACH(lib_entry_head, lib_elt) {
if (lib_elt->if_pid == if_pid) {
LL_FOREACH(lib_entry_head->if_addr_list_head, addr_elt) {
if (addr_elt->address == addr) {
/* Address already known for the interface */
result = 0;
break;
}
}
if (result) {
/* Existing interface entry, but new address */
result = add_address_to_if(lib_elt, addr);
break;
}
}
}
if (result) {
/* New interface, create a lib entry */
result = create_if_entry(if_pid, addr);
}
mutex_unlock(&mtx_lib_access);
return result;
}
void lib_rem_if(kernel_pid_t if_pid)
{
lib_entry_t *lib_elt, *lib_tmp;
mutex_lock(&mtx_lib_access);
LL_FOREACH_SAFE(lib_entry_head, lib_elt, lib_tmp) {
if (lib_elt->if_pid == if_pid) {
nhdp_free_addr_list(lib_elt->if_addr_list_head);
LL_DELETE(lib_entry_head, lib_elt);
free(lib_elt);
break;
}
}
mutex_unlock(&mtx_lib_access);
}
void lib_fill_wr_addresses(kernel_pid_t if_pid, struct rfc5444_writer *wr)
{
lib_entry_t *lib_elt;
nhdp_addr_entry_t *add_tmp;
mutex_lock(&mtx_lib_access);
/* First fill the list for LOCAL_IF = THIS_IF */
LL_FOREACH(lib_entry_head, lib_elt) {
if (lib_elt->if_pid == if_pid) {
LL_FOREACH(lib_elt->if_addr_list_head, add_tmp) {
nhdp_writer_add_addr(wr, add_tmp->address,
RFC5444_ADDRTLV_LOCAL_IF, RFC5444_LOCALIF_THIS_IF,
NHDP_METRIC_UNKNOWN, NHDP_METRIC_UNKNOWN);
add_tmp->address->in_tmp_table = NHDP_ADDR_TMP_ANY;
}
break;
}
}
/* Second fill the list for LOCAL_IF = OTHER_IF */
LL_FOREACH(lib_entry_head, lib_elt) {
if (lib_elt->if_pid != if_pid) {
LL_FOREACH(lib_elt->if_addr_list_head, add_tmp) {
/* Check if this address is not already included in a list */
if (!NHDP_ADDR_TMP_IN_ANY(add_tmp->address)) {
/* Address can be added */
nhdp_writer_add_addr(wr, add_tmp->address,
RFC5444_ADDRTLV_LOCAL_IF, RFC5444_LOCALIF_OTHER_IF,
NHDP_METRIC_UNKNOWN, NHDP_METRIC_UNKNOWN);
add_tmp->address->in_tmp_table = NHDP_ADDR_TMP_ANY;
}
}
}
}
mutex_unlock(&mtx_lib_access);
}
uint8_t lib_is_reg_addr(kernel_pid_t if_pid, nhdp_addr_t *addr)
{
lib_entry_t *lib_elt;
nhdp_addr_entry_t *addr_elt;
LL_FOREACH(lib_entry_head, lib_elt) {
LL_FOREACH(lib_elt->if_addr_list_head, addr_elt) {
if (addr_elt->address == addr) {
if (lib_elt->if_pid == if_pid) {
/* Given address is assigned to the given IF */
return 1;
}
/* Given address is assigned to any other IF */
return 2;
}
}
}
return 0;
}
/*------------------------------------------------------------------------------------*/
/* Internal functions */
/*------------------------------------------------------------------------------------*/
/**
* Create an entry for a newly registered interface
*/
static int create_if_entry(kernel_pid_t if_pid, nhdp_addr_t *addr)
{
lib_entry_t *new_entry;
new_entry = (lib_entry_t *) malloc(sizeof(lib_entry_t));
if (!new_entry) {
/* Insufficient memory */
return -1;
}
new_entry->if_addr_list_head = NULL;
new_entry->if_pid = if_pid;
if (add_address_to_if(new_entry, addr)) {
/* Insufficient memory */
free(new_entry);
return -1;
}
LL_PREPEND(lib_entry_head, new_entry);
return 0;
}
/**
* Add another address to an interface entry
*/
static int add_address_to_if(lib_entry_t *if_entry, nhdp_addr_t *addr)
{
nhdp_addr_entry_t *new_entry = (nhdp_addr_entry_t *) malloc(sizeof(nhdp_addr_entry_t));
if (!new_entry) {
/* Insufficient memory */
return -1;
}
/* Increment usage counter of address in central NHDP address storage */
addr->usg_count++;
new_entry->address = addr;
LL_PREPEND(if_entry->if_addr_list_head, new_entry);
return 0;
}
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