bsd/net/bpfdesc.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Copyright (c) 1990, 1991, 1993
  25  *      The Regents of the University of California.  All rights reserved.
  26  *
  27  * This code is derived from the Stanford/CMU enet packet filter,
  28  * (net/enet.c) distributed as part of 4.3BSD, and code contributed
  29  * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
  30  * Berkeley Laboratory.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)bpfdesc.h   8.1 (Berkeley) 6/10/93
  61  *
  62  * $FreeBSD: src/sys/net/bpfdesc.h,v 1.14.2.1 2000/03/19 05:55:36 rwatson Exp $
  63  */
  64
  65 #ifndef _NET_BPFDESC_H_
  66 #define _NET_BPFDESC_H_
  67 #include <sys/appleapiopts.h>
  68 #ifdef KERNEL_PRIVATE
  69 /*
  70  * The items in this header file should be wrapped in #ifdef KERNEL.
  71  */
  72
  73 #include <sys/select.h>
  74
  75 /*
  76  * Descriptor associated with each open bpf file.
  77  */
  78 struct bpf_d {
  79         struct bpf_d    *bd_next;       /* Linked list of descriptors */
  80         /*
  81          * Buffer slots: two mbuf clusters buffer the incoming packets.
  82          *   The model has three slots.  Sbuf is always occupied.
  83          *   sbuf (store) - Receive interrupt puts packets here.
  84          *   hbuf (hold) - When sbuf is full, put cluster here and
  85          *                 wakeup read (replace sbuf with fbuf).
  86          *   fbuf (free) - When read is done, put cluster here.
  87          * On receiving, if sbuf is full and fbuf is 0, packet is dropped.
  88          */
  89         caddr_t         bd_sbuf;        /* store slot */
  90         caddr_t         bd_hbuf;        /* hold slot */
  91         caddr_t         bd_fbuf;        /* free slot */
  92         int             bd_slen;        /* current length of store buffer */
  93         int             bd_hlen;        /* current length of hold buffer */
  94
  95         int             bd_bufsize;     /* absolute length of buffers */
  96
  97         struct bpf_if * bd_bif;         /* interface descriptor */
  98         u_long          bd_rtout;       /* Read timeout in 'ticks' */
  99         struct bpf_insn *bd_filter;     /* filter code */
 100         u_long          bd_rcount;      /* number of packets received */
 101         u_long          bd_dcount;      /* number of packets dropped */
 102
 103         u_char          bd_promisc;     /* true if listening promiscuously */
 104         u_char          bd_state;       /* idle, waiting, or timed out */
 105         u_char          bd_immediate;   /* true to return on packet arrival */
 106         int             bd_async;       /* non-zero if packet reception should generate signal */
 107         int             bd_sig;         /* signal to send upon packet reception */
 108 #ifdef __APPLE__
 109         pid_t           bd_sigio;
 110 #else
 111         struct sigio *  bd_sigio;       /* information for async I/O */
 112 #endif
 113
 114 #if BSD < 199103
 115         u_char          bd_selcoll;     /* true if selects collide */
 116         int             bd_timedout;
 117         struct proc *   bd_selproc;     /* process that last selected us */
 118 #else
 119         u_char          bd_pad;         /* explicit alignment */
 120         struct selinfo  bd_sel;         /* bsd select info */
 121 #endif
 122         int             bd_hdrcmplt;    /* false to fill in src lladdr automatically */
 123         int             bd_seesent;     /* true if bpf should see sent packets */
 124
 125 };
 126
 127 /*
 128  * Descriptor associated with each attached hardware interface.
 129  */
 130 struct bpf_if {
 131         struct bpf_if *bif_next;        /* list of all interfaces */
 132         struct bpf_d *bif_dlist;        /* descriptor list */
 133         u_int bif_dlt;                  /* link layer type */
 134         u_int bif_hdrlen;               /* length of header (with padding) */
 135         struct ifnet *bif_ifp;          /* corresponding interface */
 136 };
 137
 138 #endif /* KERNEL_PRIVATE */
 139 #endif