/* tcp.h 1.23 82/12/28 */
* Per RFC 793, September, 1981.
u_short th_sport
; /* source port */
u_short th_dport
; /* destination port */
tcp_seq th_seq
; /* sequence number */
tcp_seq th_ack
; /* acknowledgement number */
u_char th_x2
:4, /* (unused) */
th_off
:4; /* data offset */
u_char th_off
:4, /* data offset */
u_short th_win
; /* window */
u_short th_sum
; /* checksum */
u_short th_urp
; /* urgent pointer */