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/* $OpenBSD: bpfdesc.h,v 1.43 2020/12/26 16:30:58 cheloha Exp $ */
/* $NetBSD: bpfdesc.h,v 1.11 1995/09/27 18:30:42 thorpej 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. 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
*/
#ifndef _NET_BPFDESC_H_
#define _NET_BPFDESC_H_
#ifdef _KERNEL
/*
* Locks used to protect struct members in this file:
*
* m the per-descriptor mutex (bpf_d.bd_mtx)
*/
struct bpf_program_smr {
struct bpf_program bps_bf;
struct smr_entry bps_smr;
};
/*
* Descriptor associated with each open bpf file.
*/
struct bpf_d {
SMR_SLIST_ENTRY(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.
*/
struct mutex bd_mtx; /* protect buffer slots below */
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 */
int bd_in_uiomove; /* for debugging purpose */
struct bpf_if *bd_bif; /* interface descriptor */
u_long bd_rtout; /* [m] Read timeout in 'ticks' */
u_long bd_nreaders; /* [m] # threads asleep in bpfread() */
int bd_rnonblock; /* true if nonblocking reads are set */
struct bpf_program_smr
*bd_rfilter; /* read filter code */
struct bpf_program_smr
*bd_wfilter; /* write 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 */
u_char bd_locked; /* true if descriptor is locked */
u_char bd_fildrop; /* true if filtered packets will be dropped */
u_char bd_dirfilt; /* direction filter */
int bd_hdrcmplt; /* false to fill in src lladdr automatically */
int bd_async; /* non-zero if packet reception should generate signal */
int bd_sig; /* signal to send upon packet reception */
struct sigio_ref
bd_sigio; /* async I/O registration */
u_int bd_ref; /* reference count */
struct selinfo bd_sel; /* bsd select info */
int bd_unit; /* logical unit number */
LIST_ENTRY(bpf_d) bd_list; /* descriptor list */
struct task bd_wake_task; /* delay pgsigio() and selwakeup() */
struct smr_entry
bd_smr;
};
/*
* Descriptor associated with each attached hardware interface.
*/
struct bpf_if {
struct bpf_if *bif_next; /* list of all interfaces */
SMR_SLIST_HEAD(, 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) */
const char *bif_name; /* name of "subsystem" */
struct ifnet *bif_ifp; /* corresponding interface */
};
int bpf_setf(struct bpf_d *, struct bpf_program *, int);
#endif /* _KERNEL */
#endif /* _NET_BPFDESC_H_ */
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