+#define ARP_HTYPE_ETH 0x0001
+#define RARP_REQUEST_REVERSE 0x0003
+
+#define RARP_HEADER_LEN 28
+/* RARP header only for Ethernet-IP. */
+struct rarp_header {
+ ovs_be16 hw_addr_space; /* ARP_HTYPE_ETH. */
+ ovs_be16 proto_addr_space; /* ETH_TYPE_IP. */
+ uint8_t hw_addr_length; /* ETH_ADDR_LEN. */
+ uint8_t proto_addr_length; /* IPV4_ADDR_LEN. */
+ ovs_be16 opcode; /* RARP_REQUEST_REVERSE. */
+ uint8_t src_hw_addr[ETH_ADDR_LEN];
+ ovs_be32 src_proto_addr;
+ uint8_t target_hw_addr[ETH_ADDR_LEN];
+ ovs_be32 target_proto_addr;
+} __attribute__((packed));
+BUILD_ASSERT_DECL(RARP_HEADER_LEN == sizeof(struct rarp_header));
+
+