rdsv3_ext_header_version
struct rdsv3_ext_header_version ext_hdr;
struct rdsv3_ext_header_version ext_hdr;
[RDSV3_EXTHDR_VERSION] = sizeof (struct rdsv3_ext_header_version),
sizeof (struct rdsv3_ext_header_version),
struct rdsv3_ext_header_version version;