/*****************************************************************************
 *
 *        Copyright 1989, Xylogics, Inc.  ALL RIGHTS RESERVED.
 *
 * ALL RIGHTS RESERVED. Licensed Material - Property of Xylogics, Inc.
 * This software is made available solely pursuant to the terms of a
 * software license agreement which governs its use.
 * Unauthorized duplication, distribution or sale are strictly prohibited.
 *
 * Module Function:
 *
 *	IP and UDP Header Definitions for Xenix UDP SL/IP
 *
 * Original Author:  Paul Mattes		Created on: 01/04/88
 *
 * Revision Control Information:
 *
 * $Header: /annex/common/src/./inc/slip/RCS/slip_system.h,v 1.3 1989/04/05 14:48:19 root Rel $
 *
 * This file created by RCS from:
 * $Source: /annex/common/src/./inc/slip/RCS/slip_system.h,v $
 *
 * Revision History:
 *
 * $Log: slip_system.h,v $
 * Revision 1.3  1989/04/05  14:48:19  root
 * Changed copyright notice
 *
 * Revision 1.2  88/05/31  17:08:29  parker
 * Changes for new install-annex script
 * 
 * Revision 1.1  88/04/15  12:18:32  mattes
 * Initial revision
 * 
 *
 * This file is currently under revision by:
 *
 * $Locker:  $
 *
 *****************************************************************************/

/*
 * NOTE: This header file is a condensation of several 4.3BSD header files.
 *
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

/*
 *	@(#)ip.h	7.1 (Berkeley) 6/5/86
 */

/*
 * Definitions for internet protocol version 4.
 * Per RFC 791, September 1981.
 */
#define	IPVERSION	4

/*
 * Structure of an internet header, naked of options.
 */
struct ip {
	u_char	ip_hl:4,		/* header length */
		ip_v:4;			/* version */
	u_char	ip_tos;			/* type of service */
	short	ip_len;			/* total length */
	u_short	ip_id;			/* identification */
	short	ip_off;			/* fragment offset field */
#define	IP_DF 0x4000			/* dont fragment flag */
#define	IP_MF 0x2000			/* more fragments flag */
	u_char	ip_ttl;			/* time to live */
	u_char	ip_p;			/* protocol */
	u_short	ip_sum;			/* checksum */
	struct	in_addr ip_src,ip_dst;	/* source and dest address */
};

/*
 * Internet implementation parameters.
 */
#define	MAXTTL		255		/* maximum time to live (seconds) */

#define	IP_MSS		576		/* default maximum segment size */

/*
 *	@(#)udp.h	7.1 (Berkeley) 6/5/86
 */

/*
 * Udp protocol header.
 * Per RFC 768, September, 1981.
 */
struct udphdr {
	u_short	uh_sport;		/* source port */
	u_short	uh_dport;		/* destination port */
	short	uh_ulen;		/* udp length */
	u_short	uh_sum;			/* udp checksum */
};

/*
 *	@(#)ip_var.h	7.1 (Berkeley) 6/5/86
 */

/*
 * 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 */
};

/*
 *	@(#)udp_var.h	7.1 (Berkeley) 6/5/86
 */

/*
 * UDP kernel structures and variables.
 */
struct	udpiphdr {
	struct 	ipovly ui_i;		/* overlaid ip structure */
	struct	udphdr ui_u;		/* udp header */
};
#define	ui_next		ui_i.ih_next
#define	ui_prev		ui_i.ih_prev
#define	ui_x1		ui_i.ih_x1
#define	ui_pr		ui_i.ih_pr
#define	ui_len		ui_i.ih_len
#define	ui_src		ui_i.ih_src
#define	ui_dst		ui_i.ih_dst
#define	ui_sport	ui_u.uh_sport
#define	ui_dport	ui_u.uh_dport
#define	ui_ulen		ui_u.uh_ulen
#define	ui_sum		ui_u.uh_sum

#define	UDP_TTL		30		/* time to live for UDP packets */