/*	tcpip.h	6.1	83/07/29	*//* * Tcp+ip header, after ip options removed. */struct tcpiphdr {	struct 	ipovly ti_i;		/* overlaid ip structure */	struct	tcphdr ti_t;		/* tcp header */};#define	ti_next		ti_i.ih_next#define	ti_prev		ti_i.ih_prev#define	ti_x1		ti_i.ih_x1#define	ti_pr		ti_i.ih_pr#define	ti_len		ti_i.ih_len#define	ti_src		ti_i.ih_src#define	ti_dst		ti_i.ih_dst#define	ti_sport	ti_t.th_sport#define	ti_dport	ti_t.th_dport#define	ti_seq		ti_t.th_seq#define	ti_ack		ti_t.th_ack#define	ti_x2		ti_t.th_x2#define	ti_off		ti_t.th_off#define	ti_flags	ti_t.th_flags#define	ti_win		ti_t.th_win#define	ti_sum		ti_t.th_sum#define	ti_urp		ti_t.th_urp