Initial import from FreeBSD RELENG_4:
[dragonfly.git] / sys / net / bpfdesc.h
CommitLineData
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1/*
2 * Copyright (c) 1990, 1991, 1993
3 * The Regents of the University of California. 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 * @(#)bpfdesc.h 8.1 (Berkeley) 6/10/93
39 *
40 * $FreeBSD: src/sys/net/bpfdesc.h,v 1.14.2.2 2001/12/17 19:32:33 jdp Exp $
41 */
42
43#ifndef _NET_BPFDESC_H_
44#define _NET_BPFDESC_H_
45
46#include <sys/callout.h>
47#include <sys/select.h>
48
49/*
50 * Descriptor associated with each open bpf file.
51 */
52struct bpf_d {
53 struct bpf_d *bd_next; /* Linked list of descriptors */
54 /*
55 * Buffer slots: two mbuf clusters buffer the incoming packets.
56 * The model has three slots. Sbuf is always occupied.
57 * sbuf (store) - Receive interrupt puts packets here.
58 * hbuf (hold) - When sbuf is full, put cluster here and
59 * wakeup read (replace sbuf with fbuf).
60 * fbuf (free) - When read is done, put cluster here.
61 * On receiving, if sbuf is full and fbuf is 0, packet is dropped.
62 */
63 caddr_t bd_sbuf; /* store slot */
64 caddr_t bd_hbuf; /* hold slot */
65 caddr_t bd_fbuf; /* free slot */
66 int bd_slen; /* current length of store buffer */
67 int bd_hlen; /* current length of hold buffer */
68
69 int bd_bufsize; /* absolute length of buffers */
70
71 struct bpf_if * bd_bif; /* interface descriptor */
72 u_long bd_rtout; /* Read timeout in 'ticks' */
73 struct bpf_insn *bd_filter; /* filter code */
74 u_long bd_rcount; /* number of packets received */
75 u_long bd_dcount; /* number of packets dropped */
76
77 u_char bd_promisc; /* true if listening promiscuously */
78 u_char bd_state; /* idle, waiting, or timed out */
79 u_char bd_immediate; /* true to return on packet arrival */
80 int bd_hdrcmplt; /* false to fill in src lladdr automatically */
81 int bd_seesent; /* true if bpf should see sent packets */
82 int bd_async; /* non-zero if packet reception should generate signal */
83 int bd_sig; /* signal to send upon packet reception */
84 struct sigio * bd_sigio; /* information for async I/O */
85#if BSD < 199103
86 u_char bd_selcoll; /* true if selects collide */
87 int bd_timedout;
88 struct proc * bd_selproc; /* process that last selected us */
89#else
90 u_char bd_pad; /* explicit alignment */
91 struct selinfo bd_sel; /* bsd select info */
92#endif
93 struct callout bd_callout; /* for BPF timeouts with select */
94};
95
96/* Values for bd_state */
97#define BPF_IDLE 0 /* no select in progress */
98#define BPF_WAITING 1 /* waiting for read timeout in select */
99#define BPF_TIMED_OUT 2 /* read timeout has expired in select */
100
101/*
102 * Descriptor associated with each attached hardware interface.
103 */
104struct bpf_if {
105 struct bpf_if *bif_next; /* list of all interfaces */
106 struct bpf_d *bif_dlist; /* descriptor list */
107 u_int bif_dlt; /* link layer type */
108 u_int bif_hdrlen; /* length of header (with padding) */
109 struct ifnet *bif_ifp; /* corresponding interface */
110};
111
112#endif