bsd/net/bpfdesc.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1990, 1991, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * This code is derived from the Stanford/CMU enet packet filter,
  27  * (net/enet.c) distributed as part of 4.3BSD, and code contributed
  28  * to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
  29  * Berkeley Laboratory.
  30  *
  31  * Redistribution and use in source and binary forms, with or without
  32  * modification, are permitted provided that the following conditions
  33  * are met:
  34  * 1. Redistributions of source code must retain the above copyright
  35  *    notice, this list of conditions and the following disclaimer.
  36  * 2. Redistributions in binary form must reproduce the above copyright
  37  *    notice, this list of conditions and the following disclaimer in the
  38  *    documentation and/or other materials provided with the distribution.
  39  * 3. All advertising materials mentioning features or use of this software
  40  *    must display the following acknowledgement:
  41  *      This product includes software developed by the University of
  42  *      California, Berkeley and its contributors.
  43  * 4. Neither the name of the University nor the names of its contributors
  44  *    may be used to endorse or promote products derived from this software
  45  *    without specific prior written permission.
  46  *
  47  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  48  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  49  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  50  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  51  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  52  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  53  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  54  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  55  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  56  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  57  * SUCH DAMAGE.
  58  *
  59  *      @(#)bpfdesc.h   8.1 (Berkeley) 6/10/93
  60  *
  61  * $FreeBSD: src/sys/net/bpfdesc.h,v 1.14.2.1 2000/03/19 05:55:36 rwatson Exp $
  62  */
  63
  64 #ifndef _NET_BPFDESC_H_
  65 #define _NET_BPFDESC_H_
  66 #include <sys/appleapiopts.h>
  67 #ifdef KERNEL_PRIVATE
  68 /*
  69  * The items in this header file should be wrapped in #ifdef KERNEL.
  70  */
  71
  72 #include <sys/select.h>
  73
  74 /*
  75  * Descriptor associated with each open bpf file.
  76  */
  77 struct bpf_d {
  78         struct bpf_d    *bd_next;       /* Linked list of descriptors */
  79         /*
  80          * Buffer slots: two mbuf clusters buffer the incoming packets.
  81          *   The model has three slots.  Sbuf is always occupied.
  82          *   sbuf (store) - Receive interrupt puts packets here.
  83          *   hbuf (hold) - When sbuf is full, put cluster here and
  84          *                 wakeup read (replace sbuf with fbuf).
  85          *   fbuf (free) - When read is done, put cluster here.
  86          * On receiving, if sbuf is full and fbuf is 0, packet is dropped.
  87          */
  88         caddr_t         bd_sbuf;        /* store slot */
  89         caddr_t         bd_hbuf;        /* hold slot */
  90         caddr_t         bd_fbuf;        /* free slot */
  91         int             bd_slen;        /* current length of store buffer */
  92         int             bd_hlen;        /* current length of hold buffer */
  93
  94         int             bd_bufsize;     /* absolute length of buffers */
  95
  96         struct bpf_if * bd_bif;         /* interface descriptor */
  97         u_long          bd_rtout;       /* Read timeout in 'ticks' */
  98         struct bpf_insn *bd_filter;     /* filter code */
  99         u_long          bd_rcount;      /* number of packets received */
 100         u_long          bd_dcount;      /* number of packets dropped */
 101
 102         u_char          bd_promisc;     /* true if listening promiscuously */
 103         u_char          bd_state;       /* idle, waiting, or timed out */
 104         u_char          bd_immediate;   /* true to return on packet arrival */
 105         int             bd_async;       /* non-zero if packet reception should generate signal */
 106         int             bd_sig;         /* signal to send upon packet reception */
 107 #ifdef __APPLE__
 108         pid_t           bd_sigio;
 109 #else
 110         struct sigio *  bd_sigio;       /* information for async I/O */
 111 #endif
 112
 113 #if BSD < 199103
 114         u_char          bd_selcoll;     /* true if selects collide */
 115         int             bd_timedout;
 116         struct proc *   bd_selproc;     /* process that last selected us */
 117 #else
 118         u_char          bd_pad;         /* explicit alignment */
 119         struct selinfo  bd_sel;         /* bsd select info */
 120 #endif
 121         int             bd_hdrcmplt;    /* false to fill in src lladdr automatically */
 122         int             bd_seesent;     /* true if bpf should see sent packets */
 123
 124 };
 125
 126 /*
 127  * Descriptor associated with each attached hardware interface.
 128  */
 129 struct bpf_if {
 130         struct bpf_if *bif_next;        /* list of all interfaces */
 131         struct bpf_d *bif_dlist;        /* descriptor list */
 132         u_int bif_dlt;                  /* link layer type */
 133         u_int bif_hdrlen;               /* length of header (with padding) */
 134         struct ifnet *bif_ifp;          /* corresponding interface */
 135 };
 136
 137 #endif /* KERNEL_PRIVATE */
 138 #endif