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/* Copyright (C) 2007-2012 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/**
* \file
*
* \author Victor Julien <victor@inliniac.net>
*
* Defrag tracker queue handler functions
*/
#include "suricata-common.h"
#include "threads.h"
#include "debug.h"
#include "defrag-queue.h"
#include "util-error.h"
#include "util-debug.h"
#include "util-print.h"
DefragTrackerQueue *DefragTrackerQueueInit (DefragTrackerQueue *q)
{
if (q != NULL) {
memset(q, 0, sizeof(DefragTrackerQueue));
DQLOCK_INIT(q);
}
return q;
}
DefragTrackerQueue *DefragTrackerQueueNew()
{
DefragTrackerQueue *q = (DefragTrackerQueue *)SCMalloc(sizeof(DefragTrackerQueue));
if (q == NULL) {
SCLogError(SC_ERR_FATAL, "Fatal error encountered in DefragTrackerQueueNew. Exiting...");
exit(EXIT_SUCCESS);
}
q = DefragTrackerQueueInit(q);
return q;
}
/**
* \brief Destroy a tracker queue
*
* \param q the tracker queue to destroy
*/
void DefragTrackerQueueDestroy (DefragTrackerQueue *q)
{
DQLOCK_DESTROY(q);
}
/**
* \brief add a tracker to a queue
*
* \param q queue
* \param dt tracker
*/
void DefragTrackerEnqueue (DefragTrackerQueue *q, DefragTracker *dt)
{
#ifdef DEBUG
BUG_ON(q == NULL || dt == NULL);
#endif
DQLOCK_LOCK(q);
/* more trackers in queue */
if (q->top != NULL) {
dt->lnext = q->top;
q->top->lprev = dt;
q->top = dt;
/* only tracker */
} else {
q->top = dt;
q->bot = dt;
}
q->len++;
#ifdef DBG_PERF
if (q->len > q->dbg_maxlen)
q->dbg_maxlen = q->len;
#endif /* DBG_PERF */
DQLOCK_UNLOCK(q);
}
/**
* \brief remove a tracker from the queue
*
* \param q queue
*
* \retval dt tracker or NULL if empty list.
*/
DefragTracker *DefragTrackerDequeue (DefragTrackerQueue *q)
{
DQLOCK_LOCK(q);
DefragTracker *dt = q->bot;
if (dt == NULL) {
DQLOCK_UNLOCK(q);
return NULL;
}
/* more packets in queue */
if (q->bot->lprev != NULL) {
q->bot = q->bot->lprev;
q->bot->lnext = NULL;
/* just the one we remove, so now empty */
} else {
q->top = NULL;
q->bot = NULL;
}
#ifdef DEBUG
BUG_ON(q->len == 0);
#endif
if (q->len > 0)
q->len--;
dt->lnext = NULL;
dt->lprev = NULL;
DQLOCK_UNLOCK(q);
return dt;
}
uint32_t DefragTrackerQueueLen(DefragTrackerQueue *q)
{
uint32_t len;
DQLOCK_LOCK(q);
len = q->len;
DQLOCK_UNLOCK(q);
return len;
}
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