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/* Copyright (C) 2007-2020 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 "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(void)
{
FlowQueue *q = (FlowQueue *)SCMalloc(sizeof(FlowQueue));
if (q == NULL) {
SCLogError("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);
}
void FlowQueuePrivateAppendFlow(FlowQueuePrivate *fqc, Flow *f)
{
if (fqc->top == NULL) {
fqc->top = fqc->bot = f;
fqc->len = 1;
} else {
fqc->bot->next = f;
fqc->bot = f;
fqc->len++;
}
f->next = NULL;
}
void FlowQueuePrivatePrependFlow(FlowQueuePrivate *fqc, Flow *f)
{
f->next = fqc->top;
fqc->top = f;
if (f->next == NULL) {
fqc->bot = f;
}
fqc->len++;
}
void FlowQueuePrivateAppendPrivate(FlowQueuePrivate *dest, FlowQueuePrivate *src)
{
if (src->top == NULL)
return;
if (dest->bot == NULL) {
dest->top = src->top;
dest->bot = src->bot;
dest->len = src->len;
} else {
dest->bot->next = src->top;
dest->bot = src->bot;
dest->len += src->len;
}
src->top = src->bot = NULL;
src->len = 0;
}
static inline void FlowQueueAtomicSetNonEmpty(FlowQueue *fq)
{
if (SC_ATOMIC_GET(fq->non_empty) == false) {
SC_ATOMIC_SET(fq->non_empty, true);
}
}
static inline void FlowQueueAtomicSetEmpty(FlowQueue *fq)
{
if (SC_ATOMIC_GET(fq->non_empty) == true) {
SC_ATOMIC_SET(fq->non_empty, false);
}
}
void FlowQueueAppendPrivate(FlowQueue *fq, FlowQueuePrivate *fqc)
{
if (fqc->top == NULL)
return;
FQLOCK_LOCK(fq);
if (fq->qbot == NULL) {
fq->qtop = fqc->top;
fq->qbot = fqc->bot;
fq->qlen = fqc->len;
} else {
fq->qbot->next = fqc->top;
fq->qbot = fqc->bot;
fq->qlen += fqc->len;
}
FlowQueueAtomicSetNonEmpty(fq);
FQLOCK_UNLOCK(fq);
fqc->top = fqc->bot = NULL;
fqc->len = 0;
}
FlowQueuePrivate FlowQueueExtractPrivate(FlowQueue *fq)
{
FQLOCK_LOCK(fq);
FlowQueuePrivate fqc = fq->priv;
fq->qtop = fq->qbot = NULL;
fq->qlen = 0;
FlowQueueAtomicSetEmpty(fq);
FQLOCK_UNLOCK(fq);
return fqc;
}
Flow *FlowQueuePrivateGetFromTop(FlowQueuePrivate *fqc)
{
Flow *f = fqc->top;
if (f == NULL) {
return NULL;
}
fqc->top = f->next;
f->next = NULL;
fqc->len--;
if (fqc->top == NULL) {
fqc->bot = NULL;
}
return f;
}
/**
* \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);
FlowQueuePrivateAppendFlow(&q->priv, f);
FlowQueueAtomicSetNonEmpty(q);
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 = FlowQueuePrivateGetFromTop(&q->priv);
if (f == NULL)
FlowQueueAtomicSetEmpty(q);
FQLOCK_UNLOCK(q);
return f;
}
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