1 files changed, 106 insertions, 0 deletions
diff --git a/src/flow-hash.h b/src/flow-hash.h
new file mode 100644
index 0000000..201eb64
--- /dev/null
+++ b/src/flow-hash.h
@@ -0,0 +1,106 @@
+/* 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__ */
+