+#define TCPOPT_CC 11 /* T/TCP CC options (rfc1644) */
+#define TCPOPT_CCNEW 12 /* T/TCP CC options (rfc1644) */
+#define TCPOPT_CCECHO 13 /* T/TCP CC options (rfc1644) */
+#define TCPOPT_SIGNATURE 19 /* Keyed MD5 (rfc2385) */
+#define TCPOLEN_SIGNATURE 18
+#define TCP_SIGLEN 16 /* length of an option 19 digest */
+#define TCPOPT_SCPS 20 /* SCPS-TP (CCSDS 714.0-B-2) */
+#define TCPOPT_UTO 28 /* tcp user timeout (rfc5482) */
+#define TCPOLEN_UTO 4
+#define TCPOPT_TCPAO 29 /* TCP authentication option (rfc5925) */
+#define TCPOPT_MPTCP 30 /* MPTCP options */
+#define TCPOPT_FASTOPEN 34 /* TCP Fast Open (rfc7413) */
+#define TCPOPT_EXPERIMENT2 254 /* experimental headers (rfc4727) */