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