LCOM1920-T02G10

/*        $NetBSD: bpfdesc.h,v 1.38 2013/11/15 00:12:44 rmind 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

 *

 * @(#) Header: bpfdesc.h,v 1.14 96/06/16 22:28:07 leres Exp  (LBL)

 */

#ifndef _NET_BPFDESC_H_

#define _NET_BPFDESC_H_

#include <sys/callout.h>

#include <sys/selinfo.h>                /* for struct selinfo */

#include <net/if.h>                        /* for IFNAMSIZ */

#include <net/bpfjit.h>                        /* for bpfjit_function_t */

/*

 * 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.

         */

        void *                bd_sbuf;        /* store slot */

        void *                bd_hbuf;        /* hold slot */

        void *                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_long                bd_ccount;        /* number of packets captured */

        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 */

        int                bd_seesent;        /* true if bpf should see sent packets */

        int                 bd_feedback;        /* true to feed back sent packets */

        int                bd_async;        /* non-zero if packet reception should generate signal */

        pid_t                bd_pgid;        /* process or group id for signal */

#if BSD < 199103

        u_char                bd_selcoll;        /* true if selects collide */

        int                bd_timedout;

        struct proc *        bd_selproc;        /* process that last selected us */

#else

        u_char                bd_pad;                /* explicit alignment */

        struct selinfo        bd_sel;                /* bsd select info */

#endif

        callout_t        bd_callout;        /* for BPF timeouts with select */

        pid_t                bd_pid;                /* corresponding PID */

        LIST_ENTRY(bpf_d) bd_list;        /* list of all BPF's */

        void                *bd_sih;        /* soft interrupt handle */

        struct timespec bd_atime;        /* access time */

        struct timespec bd_mtime;        /* modification time */

        struct timespec bd_btime;        /* birth time */

#ifdef _LP64

        int                bd_compat32;        /* 32-bit stream on LP64 system */

#endif

        bpfjit_func_t        bd_jitcode;        /* compiled filter program */

};

/* 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 */

/*

 * Description associated with the external representation of each

 * open bpf file.

 */

struct bpf_d_ext {

        int32_t                bde_bufsize;

        uint8_t                bde_promisc;

        uint8_t                bde_state;

        uint8_t                bde_immediate;

        int32_t                bde_hdrcmplt;

        int32_t                bde_seesent;

        pid_t                bde_pid;

        uint64_t        bde_rcount;                /* number of packets received */

        uint64_t        bde_dcount;                /* number of packets dropped */

        uint64_t        bde_ccount;                /* number of packets captured */

        char                bde_ifname[IFNAMSIZ];

};

/*

 * 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 */

};

#ifdef _KERNEL

int         bpf_setf(struct bpf_d *, struct bpf_program *);

#endif

#endif /* !_NET_BPFDESC_H_ */