/*
 * tcpip.h
 *
 * Derived from:
 *
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that this notice is preserved and that due credit is given
 * to the University of California at Berkeley. The name of the University
 * may not be used to endorse or promote products derived from this
 * software without specific prior written permission. This software
 * is provided ``as is'' without express or implied warranty.
 *
 *	@(#)tcpip.h	7.2 (Berkeley) 12/7/87
 *
 * Modified for x-kernel v3.3
 * Modifications Copyright (c) 1991,1996  Arizona Board of Regents
 *
 * $Revision: 1.2 $
 * $Date: 1996/02/01 15:30:57 $
 */

/*
 * Tcp+ip header, after ip options removed.
 */
/*
 * Overlay for ip header used by other protocols (tcp, udp).
*/
struct ipovly {
	caddr_t ih_next, ih_prev;       /* for protocol sequence q's */
	u_char  ih_x1;                  /* (unused) */
	u_char  ih_pr;                  /* protocol */
	short   ih_len;                 /* protocol length */
	struct  in_addr ih_src;         /* source internet address */
	struct  in_addr ih_dst;         /* destination internet address */
};
struct tcpiphdr {
	struct 	ipovly 	ti_i;		/* overlaid ip structure */
	struct	tcphdr 	ti_t;		/* tcp header */
	IPpseudoHdr	ti_p;
};
#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