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/* Copyright (C) 2007-2013 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>
*
* Flow queue handler functions
*/
#include "suricata-common.h"
#include "threads.h"
#include "debug.h"
#include "flow-private.h"
#include "flow-queue.h"
#include "flow-util.h"
#include "util-error.h"
#include "util-debug.h"
#include "util-print.h"
FlowQueue *FlowQueueNew()
{
FlowQueue *q = (FlowQueue *)SCMalloc(sizeof(FlowQueue));
if (q == NULL) {
SCLogError(SC_ERR_FATAL, "Fatal error encountered in FlowQueueNew. Exiting...");
exit(EXIT_SUCCESS);
}
q = FlowQueueInit(q);
return q;
}
FlowQueue *FlowQueueInit (FlowQueue *q)
{
if (q != NULL) {
memset(q, 0, sizeof(FlowQueue));
FQLOCK_INIT(q);
}
return q;
}
/**
* \brief Destroy a flow queue
*
* \param q the flow queue to destroy
*/
void FlowQueueDestroy (FlowQueue *q)
{
FQLOCK_DESTROY(q);
}
/**
* \brief add a flow to a queue
*
* \param q queue
* \param f flow
*/
void FlowEnqueue (FlowQueue *q, Flow *f)
{
#ifdef DEBUG
BUG_ON(q == NULL || f == NULL);
#endif
FQLOCK_LOCK(q);
/* more flows in queue */
if (q->top != NULL) {
f->lnext = q->top;
q->top->lprev = f;
q->top = f;
/* only flow */
} else {
q->top = f;
q->bot = f;
}
q->len++;
#ifdef DBG_PERF
if (q->len > q->dbg_maxlen)
q->dbg_maxlen = q->len;
#endif /* DBG_PERF */
FQLOCK_UNLOCK(q);
}
/**
* \brief remove a flow from the queue
*
* \param q queue
*
* \retval f flow or NULL if empty list.
*/
Flow *FlowDequeue (FlowQueue *q)
{
FQLOCK_LOCK(q);
Flow *f = q->bot;
if (f == NULL) {
FQLOCK_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--;
f->lnext = NULL;
f->lprev = NULL;
FQLOCK_UNLOCK(q);
return f;
}
/**
* \brief Transfer a flow from a queue to the spare queue
*
* \param f the flow to be transfered
* \param q the source queue, where the flow will be removed. This queue is locked.
*
* \note spare queue needs locking
*/
void FlowMoveToSpare(Flow *f)
{
/* now put it in spare */
FQLOCK_LOCK(&flow_spare_q);
/* add to new queue (append) */
f->lprev = flow_spare_q.bot;
if (f->lprev != NULL)
f->lprev->lnext = f;
f->lnext = NULL;
flow_spare_q.bot = f;
if (flow_spare_q.top == NULL)
flow_spare_q.top = f;
flow_spare_q.len++;
#ifdef DBG_PERF
if (flow_spare_q.len > flow_spare_q.dbg_maxlen)
flow_spare_q.dbg_maxlen = flow_spare_q.len;
#endif /* DBG_PERF */
FQLOCK_UNLOCK(&flow_spare_q);
}
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