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diff --git a/src/mongo/bson/bson_depth.h b/src/mongo/bson/bson_depth.h
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+/**
+ * Copyright (C) 2017 MongoDB Inc.
+ *
+ * This program is free software: you can redistribute it and/or  modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * As a special exception, the copyright holders give permission to link the
+ * code of portions of this program with the OpenSSL library under certain
+ * conditions as described in each individual source file and distribute
+ * linked combinations including the program with the OpenSSL library. You
+ * must comply with the GNU Affero General Public License in all respects
+ * for all of the code used other than as permitted herein. If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so. If you do not
+ * wish to do so, delete this exception statement from your version. If you
+ * delete this exception statement from all source files in the program,
+ * then also delete it in the license file.
+ */
+
+#pragma once
+
+#include <cstdint>
+
+namespace mongo {
+/**
+ * Controls the maximum BSON depth tolerated by the server.
+ */
+struct BSONDepth {
+    // The default BSON depth nesting limit.
+    static constexpr std::int32_t kDefaultMaxAllowableDepth = 200;
+
+    // The minimum allowable value for the BSON depth parameter.
+    static constexpr std::int32_t kBSONDepthParameterFloor = 5;
+
+    // The maximum allowable value for the BSON depth parameter.
+    static constexpr std::int32_t kBSONDepthParameterCeiling = 1000;
+
+    // The depth of BSON accepted by the server. Configurable via the 'maxBSONDepth' server
+    // parameter.
+    static std::int32_t maxAllowableDepth;
+
+    /**
+     * Returns the maximum allowable BSON depth as an unsigned integer.
+     */
+    static std::uint32_t getMaxAllowableDepth();
+};
+}  // namespace mongo