--- /dev/null
+/*!\file net/bpfdesc.h
+ * Berkeley Packet Filter definitions.
+ */
+
+/* $NetBSD: bpfdesc.h,v 1.13 1997/10/09 18:58:12 christos Exp $ */
+
+/*
+ * Copyright (c) 1990, 1991, 1993
+ * 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 and Van Jacobson both 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 8.1 (Berkeley) 6/10/93
+ *
+ * @(#) Header: bpfdesc.h,v 1.14 96/06/16 22:28:07 leres Exp (LBL)
+ */
+
+#ifndef __NET_BPF_DESC_H
+#define __NET_BPF_DESC_H
+
+/*
+ * 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 */
+
+ u_char bd_promisc; /* true if listening promiscuously */
+ u_char bd_state; /* idle, waiting, or timed out */
+ u_char bd_immediate; /* true to return on packet arrival */
+ int bd_async; /* non-zero if packet reception should generate signal */
+ int bd_pgid; /* process or group id for signal */
+#if BSD < 199103
+ u_char bd_selcoll; /* true if selects collide */
+ int bd_timedout;
+ struct proc * bd_selproc; /* process that last selected us */
+#else
+ u_char bd_pad; /* explicit alignment */
+ struct selinfo bd_sel; /* bsd select info */
+#endif
+};
+
+/*
+ * 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 */
+};
+
+#endif
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