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diff --git a/src/defrag.h b/src/defrag.h
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+/* Copyright (C) 2007-2013 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 Endace Technology Limited, Jason Ish <jason.ish@endace.com>
+ */
+
+#ifndef __DEFRAG_H__
+#define __DEFRAG_H__
+
+#include "threads.h"
+#include "util-pool.h"
+#include "threadvars.h"
+#include "decode.h"
+
+/**
+ * A context for an instance of a fragmentation re-assembler, in case
+ * we ever need more than one.
+ */
+typedef struct DefragContext_ {
+    Pool *frag_pool; /**< Pool of fragments. */
+    SCMutex frag_pool_lock;
+
+    time_t timeout; /**< Default timeout. */
+} DefragContext;
+
+/**
+ * Storage for an individual fragment.
+ */
+typedef struct Frag_ {
+    uint16_t offset;            /**< The offset of this fragment, already
+                                 *   multiplied by 8. */
+
+    uint32_t len; /**< The length of this fragment. */
+
+    uint8_t hlen;               /**< The length of this fragments IP header. */
+
+    uint8_t more_frags:4;       /**< More frags? */
+    uint8_t skip:4;             /**< Skip this fragment during re-assembly. */
+
+    uint16_t ip_hdr_offset;     /**< Offset in the packet where the IP
+                                 * header starts. */
+    uint16_t frag_hdr_offset;   /**< Offset in the packet where the frag
+                                 * header starts. */
+
+    uint16_t data_offset;       /**< Offset to the packet data. */
+    uint16_t data_len;          /**< Length of data. */
+
+    uint16_t ltrim;             /**< Number of leading bytes to trim when
+                                 * re-assembling the packet. */
+
+    uint8_t *pkt;               /**< The actual packet. */
+
+#ifdef DEBUG
+    uint64_t pcap_cnt;          /**< pcap_cnt of original packet */
+#endif
+
+    RB_ENTRY(Frag_) rb;
+} Frag;
+
+int DefragRbFragCompare(struct Frag_ *a, struct Frag_ *b);
+
+RB_HEAD(IP_FRAGMENTS, Frag_);
+RB_PROTOTYPE(IP_FRAGMENTS, Frag_, rb, DefragRbFragCompare);
+
+/**
+ * A defragmentation tracker.  Used to track fragments that make up a
+ * single packet.
+ */
+typedef struct DefragTracker_ {
+    SCMutex lock; /**< Mutex for locking list operations on
+                           * this tracker. */
+
+    uint16_t vlan_id[VLAN_MAX_LAYERS]; /**< VLAN ID tracker applies to. */
+
+    uint32_t id; /**< IP ID for this tracker.  32 bits for IPv6, 16
+                  * for IPv4. */
+
+    uint8_t proto; /**< IP protocol for this tracker. */
+
+    uint8_t policy; /**< Reassembly policy this tracker will use. */
+
+    uint8_t af; /**< Address family for this tracker, AF_INET or
+                 * AF_INET6. */
+
+    uint8_t seen_last; /**< Has this tracker seen the last fragment? */
+
+    uint8_t remove; /**< remove */
+
+    Address src_addr; /**< Source address for this tracker. */
+    Address dst_addr; /**< Destination address for this tracker. */
+
+    SCTime_t timeout;       /**< When this tracker will timeout. */
+    uint32_t host_timeout;  /**< Host timeout, statically assigned from the yaml */
+
+    /** use cnt, reference counter */
+    SC_ATOMIC_DECLARE(unsigned int, use_cnt);
+
+    struct IP_FRAGMENTS fragment_tree;
+
+    /** hash pointers, protected by hash row mutex/spin */
+    struct DefragTracker_ *hnext;
+    struct DefragTracker_ *hprev;
+
+    /** list pointers, protected by tracker-queue mutex/spin */
+    struct DefragTracker_ *lnext;
+    struct DefragTracker_ *lprev;
+} DefragTracker;
+
+void DefragInit(void);
+void DefragDestroy(void);
+
+uint8_t DefragGetOsPolicy(Packet *);
+void DefragTrackerFreeFrags(DefragTracker *);
+Packet *Defrag(ThreadVars *, DecodeThreadVars *, Packet *);
+void DefragRegisterTests(void);
+
+#endif /* __DEFRAG_H__ */