diff --git a/eth.hpp b/eth.hpp
new file mode 100644
index 0000000..d9ddf95
--- /dev/null
+++ b/eth.hpp
@@ -0,0 +1,17 @@
+#pragma once
+
+#include <host-ipmid/ipmid-api.h>
+
+namespace google
+{
+namespace ipmi
+{
+
+// Handle the eth query command.
+// Sys can query the if_name and IPMI channel of the BMC's NCSI ethernet
+// device.
+ipmi_ret_t GetEthDevice(const uint8_t* reqBuf, uint8_t* replyBuf,
+                        size_t* dataLen);
+
+} // namespace ipmi
+} // namespace google