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145 lines
3.7 KiB
C
145 lines
3.7 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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#include "suricata-common.h"
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#include "defrag.h"
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#include "defrag-hash.h"
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#include "defrag-timeout.h"
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/** \internal
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* \brief See if we can really discard this tracker. Check use_cnt reference.
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*
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* \param dt tracker
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* \param ts timestamp
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*
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* \retval 0 not timed out just yet
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* \retval 1 fully timed out, lets kill it
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*/
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static int DefragTrackerTimedOut(DefragTracker *dt, struct timeval *ts)
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{
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/** never prune a trackers that is used by a packet
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* we are currently processing in one of the threads */
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if (SC_ATOMIC_GET(dt->use_cnt) > 0) {
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return 0;
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}
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/* retain if remove is not set and not timed out */
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if (!dt->remove && timercmp(&dt->timeout, ts, >))
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return 0;
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return 1;
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}
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/**
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* \internal
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*
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* \brief check all trackers in a hash row for timing out
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*
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* \param hb tracker hash row *LOCKED*
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* \param dt last tracker in the hash row
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* \param ts timestamp
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*
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* \retval cnt timed out tracker
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*/
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static uint32_t DefragTrackerHashRowTimeout(DefragTrackerHashRow *hb, DefragTracker *dt, struct timeval *ts)
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{
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uint32_t cnt = 0;
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do {
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if (SCMutexTrylock(&dt->lock) != 0) {
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dt = dt->hprev;
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continue;
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}
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DefragTracker *next_dt = dt->hprev;
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/* check if the tracker is fully timed out and
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* ready to be discarded. */
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if (DefragTrackerTimedOut(dt, ts) == 1) {
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/* remove from the hash */
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if (dt->hprev != NULL)
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dt->hprev->hnext = dt->hnext;
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if (dt->hnext != NULL)
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dt->hnext->hprev = dt->hprev;
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if (hb->head == dt)
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hb->head = dt->hnext;
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if (hb->tail == dt)
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hb->tail = dt->hprev;
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dt->hnext = NULL;
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dt->hprev = NULL;
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DefragTrackerClearMemory(dt);
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/* no one is referring to this tracker, use_cnt 0, removed from hash
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* so we can unlock it and move it back to the spare queue. */
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SCMutexUnlock(&dt->lock);
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/* move to spare list */
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DefragTrackerMoveToSpare(dt);
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cnt++;
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} else {
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SCMutexUnlock(&dt->lock);
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}
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dt = next_dt;
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} while (dt != NULL);
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return cnt;
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}
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/**
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* \brief time out tracker from the hash
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*
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* \param ts timestamp
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*
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* \retval cnt number of timed out tracker
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*/
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uint32_t DefragTimeoutHash(struct timeval *ts)
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{
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uint32_t idx = 0;
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uint32_t cnt = 0;
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for (idx = 0; idx < defrag_config.hash_size; idx++) {
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DefragTrackerHashRow *hb = &defragtracker_hash[idx];
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if (DRLOCK_TRYLOCK(hb) != 0)
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continue;
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/* defrag hash bucket is now locked */
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if (hb->tail == NULL) {
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DRLOCK_UNLOCK(hb);
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continue;
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}
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/* we have a tracker, or more than one */
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cnt += DefragTrackerHashRowTimeout(hb, hb->tail, ts);
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DRLOCK_UNLOCK(hb);
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}
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return cnt;
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}
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