/*
 * Copyright (c) 1995, 1998
 *	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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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.
 */

/* ber.h: declarations for ber.c */

#ifndef SNOOP_BER_H
#define SNOOP_BER_H

#define MODEL		"poisson"

#define BER_POISSON	0
#define BER_MARKOV	1


/* ERR_PROBs are scaled by 1e9 */
#define ERR_PROB0		65536
#define ERR_PROB1		1000000
#define TRANS_PERC0		30
#define TRANS_PERC1		70

#if !defined(TIMEV)
typedef struct timeval timev;
#endif

struct ber_state {
	int     model;
	int     bytes_to_next_error; 
	u_char  protocol;
	u_short port;		/* which TCP port? 0 ==> all ports */
	
	int     burst_rate;	/* number pf pkts to blow away */

	/* Update rate of Markov state machine 100 ms */
	int     time_granularity; /* time granularity of call */
	timev   last_call_time;

	/* This is private state dependent on the error model used */
	int     markov_state;
	int     trans_perc[2];
	int     error_prob[2];
	int     disable;  /* 1 if error generation is disabled, 0 otherwise */ 
};

extern struct   ber_state ber;

#define RAND_MEAN (1<<28)
#define NUM_RANDS 50000

void ber_init __P ((void));
int  wireless_drop __P((struct mbuf *, int));
		      
#endif /* SNOOP_BER_H */