/*-
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)if_slvar.h	8.3 (Berkeley) 2/1/94
 *
 * $FreeBSD: src/sys/net/if_slvar.h,v 1.16 1999/08/28 00:48:21 peter Exp $
 * $DragonFly: src/sys/net/sl/if_slvar.h,v 1.3 2004/09/16 04:49:32 dillon Exp $
 */

#ifndef _NET_IF_SLVAR_H_
#define _NET_IF_SLVAR_H_

#include <sys/callout.h>

#if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)

/*
 * Definitions for SLIP interface data structures
 *
 * (This exists so programs like slstats can get at the definition
 *  of sl_softc.)
 */
struct sl_softc {
	struct	ifnet sc_if;		/* network-visible interface */
	struct	ifqueue sc_fastq;	/* interactive output queue */
	struct	tty *sc_ttyp;		/* pointer to tty structure */
	u_char	*sc_mp;			/* pointer to next available buf char */
	u_char	*sc_ep;			/* pointer to last available buf char */
	u_char	*sc_buf;		/* input buffer */
	u_int	sc_flags;		/* see below */
	u_int	sc_escape;	/* =1 if last char input was FRAME_ESCAPE */
	long	sc_lasttime;		/* last time a char arrived */
	long	sc_abortcount;		/* number of abort escape chars */
	long	sc_starttime;		/* time of first abort in window */
	u_int	sc_keepalive;		/* time	to decide link hang */
	u_int	sc_outfill;	/* time	to send	FRAME_END when output idle */
					/*
					 * Handles for scheduling outfill and
					 * keepalive timeouts.
					 */
	struct	callout	sc_oftimeout;
	struct	callout	sc_katimeout;
	struct	slcompress sc_comp;	/* tcp compression data */
};

#endif

/* internal flags */
#define	SC_ERROR	0x0001		/* had an input error */
#define	SC_OUTWAIT	0x0002		/* waiting for output fill */
#define	SC_KEEPALIVE	0x0004		/* input keepalive */
#define SC_STATIC       0x0008          /* it is static unit */

/* visible flags */
#define	SC_COMPRESS	IFF_LINK0	/* compress TCP traffic */
#define	SC_NOICMP	IFF_LINK1	/* suppress ICMP traffic */
#define	SC_AUTOCOMP	IFF_LINK2	/* auto-enable TCP compression */

#endif
