iokit/Drivers/network/AppleBPF/AppleBPF.cpp

   1 /*
   2  * Copyright (c) 1998-2000 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  * AppleBPF.cpp - BPF driver class implementation.
  24  *
  25  */
  26
  27 // Need to check with Simon on User/Client interface and how to do
  28 // PostLoad, and check on IOBSD (IONeededResource)
  29
  30 #include <assert.h>
  31 #include <IOKit/IOLib.h>
  32 #include "AppleBPF.h"
  33
  34 extern "C" {
  35 #include <sys/time.h>
  36 #include <net/bpf.h>
  37 #include <net/bpfdesc.h>
  38 #include <sys/malloc.h>
  39 }
  40
  41 //------------------------------------------------------------------------
  42
  43 #define super IOService
  44 OSDefineMetaClassAndStructors(AppleBPF, IOService);
  45
  46 //------------------------------------------------------------------------
  47
  48
  49 // -----------------------------------------------------------------------
  50 //
  51 // This is the first method to be called when an object of this class is
  52 // instantiated.
  53 //
  54 bool AppleBPF::init(OSDictionary * properties)
  55 {
  56         if (!super::init(properties))
  57         {       IOLog("BPF: super init failed\n");
  58                 return false;
  59         }
  60
  61         // Do class specific initialization here. Probably not necessary for
  62         // this driver.
  63
  64 //      IOLog("BPF: super init succeeded\n");
  65         return true;    // return 'true' for success, 'false' for failure.
  66 }
  67
  68 // -----------------------------------------------------------------------
  69 //
  70 // The driver has been matched, start it up. Do most initialization and
  71 // resource allocation here.
  72 //
  73 bool AppleBPF::start(IOService * provider)
  74 {       int i;
  75         OSNumber *val;
  76         extern struct bpf_d     *bpf_dtab;
  77         extern int nbpfilter;
  78
  79         if (!super::start(provider))
  80         {       IOLog("BPF: super start failed\n");
  81                 return false;
  82         }
  83
  84         val = OSDynamicCast(OSNumber, getObject("IODevCount"));
  85         if (val == 0)
  86                 nbpfilter = DEFAULT_BPF_DEV_COUNT;
  87         else
  88                 nbpfilter = val->unsigned32BitValue();
  89
  90 //      bpfops.bpf_tap = bpf_tap;
  91 //      bpfops.bpf_mtap = bpf_mtap;
  92
  93         bpf_dtab = (struct bpf_d *)IOMalloc(sizeof (struct bpf_d) * nbpfilter);
  94         if (bpf_dtab == NULL)
  95         {       IOLog("%s: couldn't get memory for descriptor table\n",
  96                       getName());
  97                 return false;
  98         }
  99
 100         /*
 101          * Mark all the descriptors free
 102          */
 103         for (i = 0; i < nbpfilter; ++i)
 104             D_MARKFREE(&bpf_dtab[i]);
 105
 106 //      IOLog("AppleBPF::start() called\n");
 107
 108         return true;    // return 'true' for success, 'false' for failure.
 109 }
 110
 111 // -----------------------------------------------------------------------
 112 //
 113 // Release all resources before the driver goes away.
 114 //
 115 void AppleBPF::stop(IOService * provider)
 116 {       extern struct bpf_d     *bpf_dtab;
 117         extern int nbpfilter;
 118
 119         IOFree((void *)bpf_dtab, sizeof (struct bpf_d) * nbpfilter);
 120 }