smoothed RTT for SCM_TIMESTAMPING_OPT_STATS control messages. added in linux commit e8bd8fca6773ef49390269bd467bf940a0841ccf
@@ -76,6 +76,7 @@ enum {
TCP_NLA_BYTES_RETRANS,
TCP_NLA_DSACK_DUPS,
TCP_NLA_REORD_SEEN,
+ TCP_NLA_SRTT,
};
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)