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-rw-r--r--include/uapi/linux/tcp.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index c07e9f90c084..dbf896f3146c 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -135,6 +135,8 @@ enum {
#define TCP_AO_GET_KEYS 41 /* List MKT(s) */
#define TCP_AO_REPAIR 42 /* Get/Set SNEs and ISNs */
+#define TCP_IS_MPTCP 43 /* Is MPTCP being used? */
+
#define TCP_REPAIR_ON 1
#define TCP_REPAIR_OFF 0
#define TCP_REPAIR_OFF_NO_WP -1 /* Turn off without window probes */