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diff --git a/src/mongo/db/commands/kill_op_cmd_base.h b/src/mongo/db/commands/kill_op_cmd_base.h
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+/**
+ * Copyright (C) 2018 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.
+ */
+
+#include "mongo/db/commands.h"
+#include "mongo/db/operation_context.h"
+
+namespace mongo {
+
+/**
+ * Base class for the killOp command, which attempts to kill a given operation. Contains code
+ * common to mongos and mongod implementations.
+ */
+class KillOpCmdBase : public BasicCommand {
+public:
+    KillOpCmdBase() : BasicCommand("killOp") {}
+
+    virtual ~KillOpCmdBase() = default;
+
+    bool supportsWriteConcern(const BSONObj& cmd) const override {
+        return false;
+    }
+
+    AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
+        return AllowedOnSecondary::kAlways;
+    }
+
+    bool adminOnly() const override {
+        return true;
+    }
+
+    Status checkAuthForCommand(Client* client,
+                               const std::string& dbname,
+                               const BSONObj& cmdObj) const final;
+
+protected:
+    /**
+     * Given an operation ID, search for an OperationContext with that ID. Returns either
+     * boost::none if no operation with the given ID exists, or the OperationContext along with the
+     * (acquired) lock for the associated Client.
+     */
+    static boost::optional<std::tuple<stdx::unique_lock<Client>, OperationContext*>>
+    findOperationContext(ServiceContext* serviceContext, unsigned int opId);
+
+    /**
+     * Find the given operation, and check if we're authorized to kill it. If the operation is
+     * found, and we're allowed to kill it, this returns the OperationContext as well as the
+     * acquired lock for the associated Client. Otherwise boost::none is returned.
+     */
+    static boost::optional<std::tuple<stdx::unique_lock<Client>, OperationContext*>>
+    findOpForKilling(Client* client, unsigned int opId);
+
+    /**
+     * Kill an operation running on this instance of mongod or mongos.
+     */
+    static void killLocalOperation(OperationContext* opCtx, unsigned int opToKill);
+
+    /**
+     * Extract the "op" field from 'cmdObj' and convert the value to unsigned int. Since BSON only
+     * supports signed number types, and an opId is unsigned, the "op" field of 'cmdObj' may be
+     * negative, so that it can be stored in a signed type. The conversion back to unsigned is
+     * taken care of here.
+     */
+    static unsigned int parseOpId(const BSONObj& cmdObj);
+
+    /**
+     * Return whether the operation being killed is "local" or not. All operations on a mongod are
+     * local. On a mongos, killOp may may kill an operation on a shard, or an operation "local" to
+     * the mongos.
+     *
+     * Expects to be passed the "op" field of the command object.
+     */
+    static bool isKillingLocalOp(const BSONElement& opElem);
+};
+
+}  // namespace mongo