mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
24a229f466
o introduce BPF_TAP and BPF_MTAP macros to hide implementation details and ease code portability o use m_getcl where appropriate Reviewed by: many Approved by: re Obtained from: NetBSD (multiple link type support)
124 lines
5.0 KiB
C
124 lines
5.0 KiB
C
/*
|
|
* 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
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _NET_BPFDESC_H_
|
|
#define _NET_BPFDESC_H_
|
|
|
|
#include <sys/_label.h>
|
|
#include <sys/callout.h>
|
|
#include <sys/selinfo.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_hdrcmplt; /* false to fill in src lladdr automatically */
|
|
int bd_seesent; /* true if bpf should see sent packets */
|
|
int bd_async; /* non-zero if packet reception should generate signal */
|
|
int bd_sig; /* signal to send upon packet reception */
|
|
struct sigio * bd_sigio; /* information for async I/O */
|
|
#if BSD < 199103
|
|
u_char bd_selcoll; /* true if selects collide */
|
|
int bd_timedout;
|
|
struct thread * bd_selthread; /* process that last selected us */
|
|
#else
|
|
u_char bd_pad; /* explicit alignment */
|
|
struct selinfo bd_sel; /* bsd select info */
|
|
#endif
|
|
struct mtx bd_mtx; /* mutex for this descriptor */
|
|
struct callout bd_callout; /* for BPF timeouts with select */
|
|
struct label bd_label; /* MAC label for descriptor */
|
|
};
|
|
|
|
/* Values for bd_state */
|
|
#define BPF_IDLE 0 /* no select in progress */
|
|
#define BPF_WAITING 1 /* waiting for read timeout in select */
|
|
#define BPF_TIMED_OUT 2 /* read timeout has expired in select */
|
|
|
|
#define BPFD_LOCK(bd) mtx_lock(&(bd)->bd_mtx)
|
|
#define BPFD_UNLOCK(bd) mtx_unlock(&(bd)->bd_mtx)
|
|
|
|
/*
|
|
* 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; /* corresponding interface */
|
|
struct mtx bif_mtx; /* mutex for interface */
|
|
};
|
|
|
|
#define BPFIF_LOCK(bif) mtx_lock(&(bif)->bif_mtx)
|
|
#define BPFIF_UNLOCK(bif) mtx_unlock(&(bif)->bif_mtx)
|
|
|
|
#endif
|