From Fang Wang:

	RFC 5482 specifies a new TCP option -- the TCP User Timeout
	Option (UTO) -- that allows one end of a TCP connection to
	advertise its current user timeout value.  The Kind of UTO
	option is 28 and the Length is 4.  The tcpdump currently does
	not recognize UTO option.

1 files changed, 3 insertions, 0 deletions

diff --git a/tcp.h b/tcp.h
index 757bfd86..ac83714f 100644
--- a/tcp.h
+++ b/tcp.h
@@ -83,6 +83,9 @@ struct tcphdr {
 #define    TCPOLEN_SIGNATURE		18
 #define TCP_SIGLEN 16			/* length of an option 19 digest */
 #define TCPOPT_AUTH             20      /* Enhanced AUTH option */
+#define	TCPOPT_UTO		28	/* tcp user timeout (rfc5482) */
+#define	   TCPOLEN_UTO			4
+
 
 #define TCPOPT_TSTAMP_HDR	\
     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)