text: /*-
   * Copyright (c) 1991 The Regents of the University of California.
   * All rights reserved.
   *
   * This code is derived from the Stanford/CMU enet packet filter,
   * (net/enet.c) distributed as part of 4.3BSD, and code contributed
   * to Berkeley by Steven McCanne of Lawrence Berkeley Laboratory.
   *
   * 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.
   *
   *	@(#)bpfdesc.h	7.1 (Berkeley) 5/7/91
   *
   * @(#) soft:cvs/ixemul/include/net/bpfdesc.h,v 1.1.1.1 1994/04/04 04:33:11 amiga Exp (LBL)
   */
  
  /*
   * Descriptor associated with each open bpf file.
   */
  struct bpf_d {
  	struct bpf_d	*bd_next;	/* Linked list of descriptors */
  	/*
  	 * Buffer slots: two mbuf clusters buffer the incoming packets.
  	 *   The model has three slots.  Sbuf is always occupied.
  	 *   sbuf (store) - Receive interrupt puts packets here.
  	 *   hbuf (hold) - When sbuf is full, put cluster here and
  	 *                 wakeup read (replace sbuf with fbuf).
  	 *   fbuf (free) - When read is done, put cluster here.
  	 * On receiving, if sbuf is full and fbuf is 0, packet is dropped.
  	 */
  	caddr_t		bd_sbuf;	/* store slot */
  	caddr_t		bd_hbuf;	/* hold slot */
  	caddr_t		bd_fbuf;	/* free slot */
  	int 		bd_slen;	/* current length of store buffer */
  	int 		bd_hlen;	/* current length of hold buffer */
  
  	int		bd_bufsize;	/* absolute length of buffers */
  
  	struct bpf_if *	bd_bif;		/* interface descriptor */
  	u_long		bd_rtout;	/* Read timeout in 'ticks' */
  	struct bpf_insn *bd_filter; 	/* filter code */
  	u_long		bd_rcount;	/* number of packets received */
  	u_long		bd_dcount;	/* number of packets dropped */
  	struct proc *	bd_selproc;	/* process that last selected us */
  
  	u_char		bd_promisc;	/* true if listening promiscuously */
  	u_char		bd_state;	/* idle, waiting, or timed out */
  	u_char		bd_selcoll;	/* true if selects collide */
  	u_char		bd_immediate;	/* true to return on packet arrival */
  };
  
  /*
   * Descriptor associated with each attached hardware interface.
   */
  struct bpf_if {
  	struct bpf_if *bif_next;	/* list of all interfaces */
  	struct bpf_d *bif_dlist;	/* descriptor list */
  	struct bpf_if **bif_driverp;	/* pointer into softc */
  	u_int bif_dlt;			/* link layer type */
  	u_int bif_hdrlen;		/* length of header (with padding) */
  	struct ifnet *bif_ifp;		/* correspoding interface */
  };
  