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/* Copyright (C) 2007-2019 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>
*
* Packet Queue portion of the engine.
*/
#include "suricata-common.h"
#include "decode.h"
#include "packet-queue.h"
#include "threads.h"
#include "suricata.h"
#include "util-var.h"
#include "pkt-var.h"
#include "util-validate.h"
#ifdef DEBUG
void PacketQueueValidateDebug(PacketQueue *q);
void PacketQueueValidate(PacketQueue *q);
void PacketQueueValidateDebug(PacketQueue *q)
{
SCLogDebug("q->len %u, q->top %p, q->bot %p", q->len, q->top, q->bot);
if (q->len == 0) {
BUG_ON(q->top != NULL);
BUG_ON(q->bot != NULL);
} else if(q->len == 1) {
SCLogDebug("q->top->next %p, q->top->prev %p", q->top->next, q->top->prev);
SCLogDebug("q->bot->next %p, q->bot->prev %p", q->bot->next, q->bot->prev);
BUG_ON(q->top != q->bot);
BUG_ON(q->top->next != NULL);
BUG_ON(q->bot->next != NULL);
BUG_ON(q->top->prev != NULL);
BUG_ON(q->bot->prev != NULL);
} else if (q->len == 2) {
SCLogDebug("q->top->next %p, q->top->prev %p", q->top->next, q->top->prev);
SCLogDebug("q->bot->next %p, q->bot->prev %p", q->bot->next, q->bot->prev);
BUG_ON(q->top == NULL);
BUG_ON(q->bot == NULL);
BUG_ON(q->top == q->bot);
BUG_ON(q->top->prev != NULL);
BUG_ON(q->top->next != q->bot);
BUG_ON(q->bot->prev != q->top);
BUG_ON(q->bot->next != NULL);
} else {
BUG_ON(q->top == NULL);
BUG_ON(q->bot == NULL);
SCLogDebug("q->top->next %p, q->top->prev %p", q->top->next, q->top->prev);
SCLogDebug("q->bot->next %p, q->bot->prev %p", q->bot->next, q->bot->prev);
BUG_ON(q->top == q->bot);
BUG_ON(q->top->prev != NULL);
BUG_ON(q->bot->next != NULL);
BUG_ON(q->top->next == q->bot);
BUG_ON(q->bot->prev == q->top);
Packet *p, *pp;
for (p = q->top, pp = p->prev; p != NULL; pp = p, p = p->next) {
SCLogDebug("p %p, pp %p, p->next %p, p->prev %p", p, pp, p->next, p->prev);
BUG_ON(pp != p->prev);
}
}
}
#define BUGGER_ON(cond) { \
if ((cond)) { \
PacketQueueValidateDebug(q); \
} \
}
void PacketQueueValidate(PacketQueue *q)
{
if (q->len == 0) {
BUGGER_ON(q->top != NULL);
BUGGER_ON(q->bot != NULL);
} else if(q->len == 1) {
BUGGER_ON(q->top != q->bot);
BUGGER_ON(q->top->next != NULL);
BUGGER_ON(q->bot->next != NULL);
BUGGER_ON(q->top->prev != NULL);
BUGGER_ON(q->bot->prev != NULL);
} else if (q->len == 2) {
BUGGER_ON(q->top == NULL);
BUGGER_ON(q->bot == NULL);
BUGGER_ON(q->top == q->bot);
BUGGER_ON(q->top->prev != NULL);
BUGGER_ON(q->top->next != q->bot);
BUGGER_ON(q->bot->prev != q->top);
BUGGER_ON(q->bot->next != NULL);
} else {
BUGGER_ON(q->top == NULL);
BUGGER_ON(q->bot == NULL);
BUGGER_ON(q->top == q->bot);
BUGGER_ON(q->top->prev != NULL);
BUGGER_ON(q->bot->next != NULL);
BUGGER_ON(q->top->next == q->bot);
BUGGER_ON(q->bot->prev == q->top);
Packet *p, *pp;
for (p = q->top, pp = p->prev; p != NULL; pp = p, p = p->next) {
BUGGER_ON(pp != p->prev);
}
}
}
#endif /* DEBUG */
static inline void PacketEnqueueDo(PacketQueue *q, Packet *p)
{
//PacketQueueValidateDebug(q);
if (p == NULL)
return;
/* more packets in queue */
if (q->top != NULL) {
p->prev = NULL;
p->next = q->top;
q->top->prev = p;
q->top = p;
/* only packet */
} else {
p->prev = NULL;
p->next = NULL;
q->top = p;
q->bot = p;
}
q->len++;
#ifdef DBG_PERF
if (q->len > q->dbg_maxlen)
q->dbg_maxlen = q->len;
#endif /* DBG_PERF */
//PacketQueueValidateDebug(q);
}
void PacketEnqueueNoLock(PacketQueueNoLock *qnl, Packet *p)
{
DEBUG_VALIDATE_BUG_ON(p->pkt_src == 0);
PacketQueue *q = (PacketQueue *)qnl;
PacketEnqueueDo(q, p);
}
void PacketEnqueue (PacketQueue *q, Packet *p)
{
PacketEnqueueDo(q, p);
}
static inline Packet *PacketDequeueDo (PacketQueue *q)
{
//PacketQueueValidateDebug(q);
/* if the queue is empty there are no packets left. */
if (q->len == 0) {
return NULL;
}
q->len--;
/* pull the bottom packet from the queue */
Packet *p = q->bot;
/* more packets in queue */
if (q->bot->prev != NULL) {
q->bot = q->bot->prev;
q->bot->next = NULL;
/* just the one we remove, so now empty */
} else {
q->top = NULL;
q->bot = NULL;
}
//PacketQueueValidateDebug(q);
p->next = NULL;
p->prev = NULL;
return p;
}
Packet *PacketDequeueNoLock (PacketQueueNoLock *qnl)
{
PacketQueue *q = (PacketQueue *)qnl;
Packet *p = PacketDequeueDo(q);
DEBUG_VALIDATE_BUG_ON(p != NULL && p->pkt_src == 0);
return p;
}
Packet *PacketDequeue (PacketQueue *q)
{
return PacketDequeueDo(q);
}
PacketQueue *PacketQueueAlloc(void)
{
PacketQueue *pq = SCCalloc(1, sizeof(*pq));
if (pq == NULL)
return NULL;
SCMutexInit(&pq->mutex_q, NULL);
SCCondInit(&pq->cond_q, NULL);
return pq;
}
void PacketQueueFree(PacketQueue *pq)
{
SCCondDestroy(&pq->cond_q);
SCMutexDestroy(&pq->mutex_q);
SCFree(pq);
}
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