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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 1999-2001 by Sun Microsystems, Inc.
* All rights reserved.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* file: pool.c
*
* This file contains all of the routines that manage
* the Home Agent's Home Address pools. This is used
* when a Mobile Node requests a Home Address by including
* a Home Address of zero (0) in the Registration
* request.
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <syslog.h>
#include <stdlib.h>
#include "mip.h"
#include "agent.h"
#include "pool.h"
/*
* This table has one entry for each pool defined in the config file
*/
extern HashTable mipPoolHash;
extern int logVerbosity;
extern char *ntoa(uint32_t, char *);
/*
* Function: CreateAddressPool
*
* Arguments: poolIdentifier - Numerical Pool Identifier
* baseAddress - The base IP address of the pool
* length - The number of addresses in the pool
*
* Description: This function will create a Pool structure
* and add it to the Hash Table. Pools are used
* to allocate Home Agent addresses to Mobile
* Nodes that request one by inserting a zero (0)
* Home Address in the Registration Request.
*
* The Pool entry will be locked upon return.
* The caller is responsible for unlocking the
* node when it is finished with it.
*
* Returns: if successful a pointer to a Pool structure
* is returned, otherwise NULL
*/
Pool *
CreateAddressPool(uint32_t poolIdentifier, ipaddr_t baseAddress,
uint32_t length)
{
Pool *pool;
int poolSize;
int i;
/*
* First, let's see if we already have this pool.
*/
if (findHashTableEntryUint(&mipPoolHash, poolIdentifier,
LOCK_NONE, NULL, 0, 0, 0) != NULL) {
syslog(LOG_ERR, "Pool %d already defined\n", poolIdentifier);
return (NULL);
}
/*
* First we allocate the memory
*/
poolSize = sizeof (Pool) + (sizeof (PoolEntry) * length);
pool = (Pool *)calloc(1, poolSize);
if (pool == NULL) {
syslog(LOG_CRIT, "FATAL: Unable to allocate address pool");
return (NULL);
}
/*
* Initialize the pool's parameters.
*/
if (rwlock_init(&pool->poolNodeLock, USYNC_THREAD, NULL)) {
syslog(LOG_ERR, "Unable to initialize read/write lock");
free(pool);
return (NULL);
}
pool->poolIdentifier = poolIdentifier;
pool->poolBaseAddress = baseAddress;
pool->poolLength = length;
/*
* Setup each Pool Entry within the Pool structure (one
* per address).
*/
for (i = 0; i < length; i++) {
/* Setup the entry's address. */
pool->poolEntry[i].poolStatus = POOL_FREE;
pool->poolEntry[i].poolHomeAddress = baseAddress + htonl(i);
}
/*
* Add it to the Hash Table.
*/
if (linkHashTableEntryUint(&mipPoolHash, poolIdentifier, pool,
LOCK_WRITE)) {
syslog(LOG_ERR, "FATAL: Unable to add pool to hash table");
free(pool);
return (NULL);
}
return (pool);
}
/*
* Function: GetAddressFromPool
*
* Arguments: poolIdentifier - Pool Identifier
*
* Description: This function will step through the Pool
* entry identified via the Pool Identifier
* and will return the first available
* Home Address.
*
* Returns: int, Home Address if successful, otherwise
* zero (0).
*/
uint32_t
GetAddressFromPool(uint32_t poolIdentifier)
{
Pool *pool;
int i;
ipaddr_t homeAddress = 0;
char buffer[INET_ADDRSTRLEN];
/*
* Let's get the pool entry, using the pool identifier.
*/
if ((pool = findHashTableEntryUint(&mipPoolHash,
poolIdentifier, LOCK_WRITE, NULL, 0, 0, 0)) == NULL) {
mipverbose(("Pool %d not found\n", poolIdentifier));
return (0);
}
for (i = 0; i < pool->poolLength; i++) {
if (pool->poolEntry[i].poolStatus == POOL_FREE) {
/*
* This one is free, let's allocate it.
*/
pool->poolEntry[i].poolStatus = POOL_TAKEN;
mipverbose(("allocated %s from pool %d\n",
ntoa(pool->poolEntry[i].poolHomeAddress, buffer),
poolIdentifier));
homeAddress = pool->poolEntry[i].poolHomeAddress;
break;
}
}
/*
* And now we unlock the node...
*/
(void) rw_unlock(&pool->poolNodeLock);
return (homeAddress);
}
/*
* Function: freeAddressFromPool
*
* Arguments: poolIdentifier - Pool Identifier
* homeAddr - Home Address
*
* Description: This function will put a Home Address
* back into the address pool by marking
* the entry as being free.
*
* Returns: boolean, _B_TRUE if the Home Address was freed.
*/
boolean_t
freeAddressFromPool(uint32_t poolIdentifier, ipaddr_t homeAddr)
{
Pool *pool;
int i;
boolean_t found = _B_FALSE;
char buffer[INET_ADDRSTRLEN];
/*
* First, let's see if we already have this pool.
*/
if ((pool = findHashTableEntryUint(&mipPoolHash,
poolIdentifier, LOCK_WRITE, NULL, 0, 0, 0)) == NULL) {
mipverbose(("Pool %d not found\n", poolIdentifier));
return (found);
}
for (i = 0; i < pool->poolLength; i++) {
if (pool->poolEntry[i].poolStatus == POOL_TAKEN &&
pool->poolEntry[i].poolHomeAddress == homeAddr) {
mipverbose(("Freed %s from pool %d\n",
ntoa(homeAddr, buffer), poolIdentifier));
pool->poolEntry[i].poolStatus = POOL_FREE;
found = _B_TRUE;
break;
}
}
/*
* And now we unlock the node...
*/
(void) rw_unlock(&pool->poolNodeLock);
return (found);
}
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