2 * Berkeley Packet Filter definitions.
5 /* $NetBSD: bpfdesc.h,v 1.13 1997/10/09 18:58:12 christos Exp $ */
8 * Copyright (c) 1990, 1991, 1993
9 * The Regents of the University of California. All rights reserved.
11 * This code is derived from the Stanford/CMU enet packet filter,
12 * (net/enet.c) distributed as part of 4.3BSD, and code contributed
13 * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
14 * Berkeley Laboratory.
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that the following conditions
19 * 1. Redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer.
21 * 2. Redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution.
24 * 3. All advertising materials mentioning features or use of this software
25 * must display the following acknowledgement:
26 * This product includes software developed by the University of
27 * California, Berkeley and its contributors.
28 * 4. Neither the name of the University nor the names of its contributors
29 * may be used to endorse or promote products derived from this software
30 * without specific prior written permission.
32 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
35 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44 * @(#)bpfdesc.h 8.1 (Berkeley) 6/10/93
46 * @(#) Header: bpfdesc.h,v 1.14 96/06/16 22:28:07 leres Exp (LBL)
49 #ifndef __NET_BPF_DESC_H
50 #define __NET_BPF_DESC_H
53 * Descriptor associated with each open bpf file.
56 struct bpf_d *bd_next; /* Linked list of descriptors */
58 * Buffer slots: two mbuf clusters buffer the incoming packets.
59 * The model has three slots. Sbuf is always occupied.
60 * sbuf (store) - Receive interrupt puts packets here.
61 * hbuf (hold) - When sbuf is full, put cluster here and
62 * wakeup read (replace sbuf with fbuf).
63 * fbuf (free) - When read is done, put cluster here.
64 * On receiving, if sbuf is full and fbuf is 0, packet is dropped.
66 caddr_t bd_sbuf; /* store slot */
67 caddr_t bd_hbuf; /* hold slot */
68 caddr_t bd_fbuf; /* free slot */
69 int bd_slen; /* current length of store buffer */
70 int bd_hlen; /* current length of hold buffer */
72 int bd_bufsize; /* absolute length of buffers */
74 struct bpf_if * bd_bif; /* interface descriptor */
75 u_long bd_rtout; /* Read timeout in 'ticks' */
76 struct bpf_insn *bd_filter; /* filter code */
77 u_long bd_rcount; /* number of packets received */
78 u_long bd_dcount; /* number of packets dropped */
80 u_char bd_promisc; /* true if listening promiscuously */
81 u_char bd_state; /* idle, waiting, or timed out */
82 u_char bd_immediate; /* true to return on packet arrival */
83 int bd_async; /* non-zero if packet reception should generate signal */
84 int bd_pgid; /* process or group id for signal */
86 u_char bd_selcoll; /* true if selects collide */
88 struct proc * bd_selproc; /* process that last selected us */
90 u_char bd_pad; /* explicit alignment */
91 struct selinfo bd_sel; /* bsd select info */
96 * Descriptor associated with each attached hardware interface.
99 struct bpf_if *bif_next; /* list of all interfaces */
100 struct bpf_d *bif_dlist; /* descriptor list */
101 struct bpf_if **bif_driverp; /* pointer into softc */
102 u_int bif_dlt; /* link layer type */
103 u_int bif_hdrlen; /* length of header (with padding) */
104 struct ifnet *bif_ifp; /* correspoding interface */