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diff --git a/servers/slapd/back-ndb/back-ndb.h b/servers/slapd/back-ndb/back-ndb.h
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+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2008-2022 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+/* ACKNOWLEDGEMENTS:
+ * This work was initially developed by Howard Chu for inclusion
+ * in OpenLDAP Software. This work was sponsored by MySQL.
+ */
+
+#ifndef SLAPD_NDB_H
+#define SLAPD_NDB_H
+
+#include "slap.h"
+
+#include <mysql.h>
+#include <NdbApi.hpp>
+
+LDAP_BEGIN_DECL
+
+/* The general design is to use one relational table per objectclass. This is
+ * complicated by objectclass inheritance and auxiliary classes though.
+ *
+ * Attributes must only occur in a single table. For objectclasses that inherit
+ * from other classes, attributes defined in the superior class are only stored
+ * in the superior class' table. When multiple unrelated classes define the same
+ * attributes, an attributeSet should be defined instead, containing all of the
+ * common attributes.
+ *
+ * The no_set table lists which other attributeSets apply to the current
+ * objectClass. The no_attrs table lists all of the non-inherited attributes of
+ * the class, including those residing in an attributeSet.
+ *
+ * Usually the table is named identically to the objectClass, but it can also
+ * be explicitly named something else if needed.
+ */
+#define NDB_MAX_OCSETS	8
+
+struct ndb_attrinfo;
+
+typedef struct ndb_ocinfo {
+	struct berval no_name;	/* objectclass cname */
+	struct berval no_table;
+	ObjectClass *no_oc;
+	struct ndb_ocinfo *no_sets[NDB_MAX_OCSETS];
+	struct ndb_attrinfo **no_attrs;
+	int no_flag;
+	int no_nsets;
+	int no_nattrs;
+} NdbOcInfo;
+
+#define	NDB_INFO_ATLEN	0x01
+#define	NDB_INFO_ATSET	0x02
+#define	NDB_INFO_INDEX	0x04
+#define	NDB_INFO_ATBLOB	0x08
+
+typedef struct ndb_attrinfo {
+	struct berval na_name;	/* attribute cname */
+	AttributeDescription *na_desc;
+	AttributeType *na_attr;
+	NdbOcInfo *na_oi;
+	int na_flag;
+	int na_len;
+	int na_column;
+	int na_ixcol;
+} NdbAttrInfo;
+
+typedef struct ListNode {
+	struct ListNode *ln_next;
+	void *ln_data;
+} ListNode;
+
+#define	NDB_IS_OPEN(ni)	(ni->ni_cluster != NULL)
+
+struct ndb_info {
+	/* NDB connection */
+	char *ni_connectstr;
+	char *ni_dbname;
+	Ndb_cluster_connection **ni_cluster;
+
+	/* MySQL connection parameters */
+	MYSQL ni_sql;
+	char *ni_hostname;
+	char *ni_username;
+	char *ni_password;
+	char *ni_socket;
+	unsigned long ni_clflag;
+	unsigned int ni_port;
+
+	/* Search filter processing */
+	int ni_search_stack_depth;
+	void *ni_search_stack;
+
+#define	DEFAULT_SEARCH_STACK_DEPTH	16
+#define	MINIMUM_SEARCH_STACK_DEPTH	8
+
+	/* Schema config */
+	NdbOcInfo *ni_opattrs;
+	ListNode *ni_attridxs;
+	ListNode *ni_attrlens;
+	ListNode *ni_attrsets;
+	ListNode *ni_attrblobs;
+	ldap_pvt_thread_rdwr_t ni_ai_rwlock;
+	Avlnode *ni_ai_tree;
+	ldap_pvt_thread_rdwr_t ni_oc_rwlock;
+	Avlnode *ni_oc_tree;
+	int ni_nconns;	/* number of connections to open */
+	int ni_nextconn;	/* next conn to use */
+	ldap_pvt_thread_mutex_t ni_conn_mutex;
+};
+
+#define	NDB_MAX_RDNS	16
+#define	NDB_RDN_LEN	128
+#define	NDB_MAX_OCS	64
+
+#define	DN2ID_TABLE	"OL_dn2id"
+#define	EID_COLUMN	0U
+#define	VID_COLUMN	1U
+#define	OCS_COLUMN	1U
+#define	RDN_COLUMN	2U
+#define	IDX_COLUMN	(2U+NDB_MAX_RDNS)
+
+#define	NEXTID_TABLE	"OL_nextid"
+
+#define	NDB_OC_BUFLEN	1026	/* 1024 data plus 2 len bytes */
+
+#define	INDEX_NAME	"OL_index"
+
+typedef struct NdbRdns {
+	short nr_num;
+	char nr_buf[NDB_MAX_RDNS][NDB_RDN_LEN+1];
+} NdbRdns;
+
+typedef struct NdbOcs {
+	int no_ninfo;
+	int no_ntext;
+	int no_nitext;	/* number of implicit classes */
+	NdbOcInfo *no_info[NDB_MAX_OCS];
+	struct berval no_text[NDB_MAX_OCS];
+	struct berval no_itext[NDB_MAX_OCS];	/* implicit classes */
+} NdbOcs;
+
+typedef struct NdbArgs {
+	Ndb *ndb;
+	NdbTransaction *txn;
+	Entry *e;
+	NdbRdns *rdns;
+	struct berval *ocs;
+	int erdns;
+} NdbArgs;
+
+#define	NDB_NO_SUCH_OBJECT	626
+#define	NDB_ALREADY_EXISTS	630
+
+LDAP_END_DECL
+
+#include "proto-ndb.h"
+
+#endif