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