2 * Copyright (c) 1990, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
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
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)bpfdesc.h 8.1 (Berkeley) 6/10/93
36 * $FreeBSD: src/sys/net/bpfdesc.h,v 1.14.2.2 2001/12/17 19:32:33 jdp Exp $
37 * $DragonFly: src/sys/net/bpfdesc.h,v 1.6 2008/03/14 09:52:10 matthias Exp $
40 #ifndef _NET_BPFDESC_H_
41 #define _NET_BPFDESC_H_
43 #include <sys/callout.h>
44 #include <sys/event.h>
47 * Descriptor associated with each open bpf file.
50 SLIST_ENTRY(bpf_d
) bd_next
; /* Linked list of descriptors */
52 * Buffer slots: two mbuf clusters buffer the incoming packets.
53 * The model has three slots. Sbuf is always occupied.
54 * sbuf (store) - Receive interrupt puts packets here.
55 * hbuf (hold) - When sbuf is full, put cluster here and
56 * wakeup read (replace sbuf with fbuf).
57 * fbuf (free) - When read is done, put cluster here.
58 * On receiving, if sbuf is full and fbuf is 0, packet is dropped.
60 caddr_t bd_sbuf
; /* store slot */
61 caddr_t bd_hbuf
; /* hold slot */
62 caddr_t bd_fbuf
; /* free slot */
63 int bd_slen
; /* current length of store buffer */
64 int bd_hlen
; /* current length of hold buffer */
66 int bd_bufsize
; /* absolute length of buffers */
68 struct bpf_if
* bd_bif
; /* interface descriptor */
69 u_long bd_rtout
; /* Read timeout in 'ticks' */
70 struct bpf_insn
*bd_rfilter
; /* read filter code */
71 struct bpf_insn
*bd_wfilter
; /* write filter code */
72 u_long bd_rcount
; /* number of packets received */
73 u_long bd_dcount
; /* number of packets dropped */
75 u_char bd_promisc
; /* true if listening promiscuously */
76 u_char bd_state
; /* idle, waiting, or timed out */
77 u_char bd_immediate
; /* true to return on packet arrival */
78 int bd_hdrcmplt
; /* false to fill in src lladdr automatically */
79 int bd_seesent
; /* true if bpf should see sent packets */
80 int bd_async
; /* non-zero if packet reception should generate signal */
81 int bd_sig
; /* signal to send upon packet reception */
82 struct sigio
* bd_sigio
; /* information for async I/O */
84 u_char bd_selcoll
; /* true if selects collide */
86 struct proc
* bd_selproc
; /* process that last selected us */
88 u_char bd_pad
; /* explicit alignment */
89 struct kqinfo bd_kq
; /* bsd kqueue info */
91 struct callout bd_callout
; /* for BPF timeouts with select */
92 int bd_locked
; /* true if descriptor is locked */
95 /* Values for bd_state */
96 #define BPF_IDLE 0 /* no select in progress */
97 #define BPF_WAITING 1 /* waiting for read timeout in select */
98 #define BPF_TIMED_OUT 2 /* read timeout has expired in select */
101 * Descriptor associated with each attached hardware interface.
104 struct bpf_if
*bif_next
; /* list of all interfaces */
105 SLIST_HEAD(, bpf_d
) bif_dlist
; /* descriptor list */
106 struct bpf_if
**bif_driverp
; /* pointer into softc */
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 */