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/* Copyright (C) 2007-2012 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>
*/
#ifndef __FLOW_HASH_H__
#define __FLOW_HASH_H__
#include "flow.h"
/** Spinlocks or Mutex for the flow buckets. */
//#define FBLOCK_SPIN
#define FBLOCK_MUTEX
#ifdef FBLOCK_SPIN
#ifdef FBLOCK_MUTEX
#error Cannot enable both FBLOCK_SPIN and FBLOCK_MUTEX
#endif
#endif
/* flow hash bucket -- the hash is basically an array of these buckets.
* Each bucket contains a flow or list of flows. All these flows have
* the same hashkey (the hash is a chained hash). When doing modifications
* to the list, the entire bucket is locked. */
typedef struct FlowBucket_ {
/** head of the list of active flows for this row. */
Flow *head;
/** head of the list of evicted flows for this row. Waiting to be
* collected by the Flow Manager. */
Flow *evicted;
#ifdef FBLOCK_MUTEX
SCMutex m;
#elif defined FBLOCK_SPIN
SCSpinlock s;
#else
#error Enable FBLOCK_SPIN or FBLOCK_MUTEX
#endif
/** timestamp in seconds of the earliest possible moment a flow
* will time out in this row. Set by the flow manager. Cleared
* to 0 by workers, either when new flows are added or when a
* flow state changes. The flow manager sets this to UINT_MAX for
* empty buckets. */
SC_ATOMIC_DECLARE(uint32_t, next_ts);
} __attribute__((aligned(CLS))) FlowBucket;
#ifdef FBLOCK_SPIN
#define FBLOCK_INIT(fb) SCSpinInit(&(fb)->s, 0)
#define FBLOCK_DESTROY(fb) SCSpinDestroy(&(fb)->s)
#define FBLOCK_LOCK(fb) SCSpinLock(&(fb)->s)
#define FBLOCK_TRYLOCK(fb) SCSpinTrylock(&(fb)->s)
#define FBLOCK_UNLOCK(fb) SCSpinUnlock(&(fb)->s)
#elif defined FBLOCK_MUTEX
#define FBLOCK_INIT(fb) SCMutexInit(&(fb)->m, NULL)
#define FBLOCK_DESTROY(fb) SCMutexDestroy(&(fb)->m)
#define FBLOCK_LOCK(fb) SCMutexLock(&(fb)->m)
#define FBLOCK_TRYLOCK(fb) SCMutexTrylock(&(fb)->m)
#define FBLOCK_UNLOCK(fb) SCMutexUnlock(&(fb)->m)
#else
#error Enable FBLOCK_SPIN or FBLOCK_MUTEX
#endif
/* prototypes */
Flow *FlowGetFlowFromHash(ThreadVars *tv, FlowLookupStruct *tctx, Packet *, Flow **);
Flow *FlowGetFromFlowKey(FlowKey *key, struct timespec *ttime, const uint32_t hash);
Flow *FlowGetExistingFlowFromFlowId(int64_t flow_id);
uint32_t FlowKeyGetHash(FlowKey *flow_key);
uint32_t FlowGetIpPairProtoHash(const Packet *p);
/** \note f->fb must be locked */
static inline void RemoveFromHash(Flow *f, Flow *prev_f)
{
FlowBucket *fb = f->fb;
/* remove from the hash */
if (prev_f != NULL) {
prev_f->next = f->next;
} else {
fb->head = f->next;
}
f->next = NULL;
f->fb = NULL;
}
#endif /* __FLOW_HASH_H__ */
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