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bpfdesc.h revision 1.5 
      1 /*-
      2  * Copyright (c) 1991 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * This code is derived from the Stanford/CMU enet packet filter,
      6  * (net/enet.c) distributed as part of 4.3BSD, and code contributed
      7  * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
      8  * Berkeley Laboratory.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  *
     38  *	from: @(#)bpfdesc.h	7.1 (Berkeley) 5/7/91
     39  * 	$Id: bpfdesc.h,v 1.5 1993/05/18 18:19:52 cgd Exp $
     40  */
     41 
     42 #ifndef _NET_BPFDESC_H_
     43 #define _NET_BPFDESC_H_
     44 
     45 /*
     46  * Descriptor associated with each open bpf file.
     47  */
     48 struct bpf_d {
     49 	struct bpf_d	*bd_next;	/* Linked list of descriptors */
     50 	/*
     51 	 * Buffer slots: two mbuf clusters buffer the incoming packets.
     52 	 *   The model has three slots.  Sbuf is always occupied.
     53 	 *   sbuf (store) - Receive interrupt puts packets here.
     54 	 *   hbuf (hold) - When sbuf is full, put cluster here and
     55 	 *                 wakeup read (replace sbuf with fbuf).
     56 	 *   fbuf (free) - When read is done, put cluster here.
     57 	 * On receiving, if sbuf is full and fbuf is 0, packet is dropped.
     58 	 */
     59 	caddr_t		bd_sbuf;	/* store slot */
     60 	caddr_t		bd_hbuf;	/* hold slot */
     61 	caddr_t		bd_fbuf;	/* free slot */
     62 	int 		bd_slen;	/* current length of store buffer */
     63 	int 		bd_hlen;	/* current length of hold buffer */
     64 
     65 	int		bd_bufsize;	/* absolute length of buffers */
     66 
     67 	struct bpf_if *	bd_bif;		/* interface descriptor */
     68 	u_long		bd_rtout;	/* Read timeout in 'ticks' */
     69 	struct bpf_insn *bd_filter; 	/* filter code */
     70 	u_long		bd_rcount;	/* number of packets received */
     71 	u_long		bd_dcount;	/* number of packets dropped */
     72 
     73 	u_char		bd_promisc;	/* true if listening promiscuously */
     74 	u_char		bd_state;	/* idle, waiting, or timed out */
     75 	u_char		bd_immediate;	/* true to return on packet arrival */
     76 #if (BSD <= 199103) && !defined(__386BSD__)
     77 	u_char		bd_selcoll;	/* true if selects collide */
     78 	int		bd_timedout;
     79 	struct proc *	bd_selproc;	/* process that last selected us */
     80 #else /* BSD > 199103 */
     81 	u_char		bd_pad;		/* explicit alignment */
     82 	struct selinfo	bd_sel;		/* bsd select info */
     83 #endif
     84 };
     85 
     86 /*
     87  * Descriptor associated with each attached hardware interface.
     88  */
     89 struct bpf_if {
     90 	struct bpf_if *bif_next;	/* list of all interfaces */
     91 	struct bpf_d *bif_dlist;	/* descriptor list */
     92 	struct bpf_if **bif_driverp;	/* pointer into softc */
     93 	u_int bif_dlt;			/* link layer type */
     94 	u_int bif_hdrlen;		/* length of header (with padding) */
     95 	struct ifnet *bif_ifp;		/* correspoding interface */
     96 };
     97 
     98 #endif /* !_NET_BPFDESC_H_ */
     99