FreeBSD/Linux Kernel Cross Reference
sys/net/bpfdesc.h

     /*      $OpenBSD: bpfdesc.h,v 1.47 2022/07/09 12:48:21 visa 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 */
            uint64_t        bd_rtout;       /* [m] Read timeout in nanoseconds */
            u_long          bd_nreaders;    /* [m] # threads asleep in bpfread() */
            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 */
           struct refcnt   bd_refcnt;      /* reference count */
           struct klist    bd_klist;       /* list of knotes */
           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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