openvpn/tap-win32/constants.h

   1 /*
   2  *  TAP-Win32 -- A kernel driver to provide virtual tap device functionality
   3  *               on Windows.  Originally derived from the CIPE-Win32
   4  *               project by Damion K. Wilson, with extensive modifications by
   5  *               James Yonan.
   6  *
   7  *  All source code which derives from the CIPE-Win32 project is
   8  *  Copyright (C) Damion K. Wilson, 2003, and is released under the
   9  *  GPL version 2 (see below).
  10  *
  11  *  All other source code is Copyright (C) 2002-2005 OpenVPN Solutions LLC,
  12  *  and is released under the GPL version 2 (see below).
  13  *
  14  *  This program is free software; you can redistribute it and/or modify
  15  *  it under the terms of the GNU General Public License version 2
  16  *  as published by the Free Software Foundation.
  17  *
  18  *  This program is distributed in the hope that it will be useful,
  19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *  GNU General Public License for more details.
  22  *
  23  *  You should have received a copy of the GNU General Public License
  24  *  along with this program (see the file COPYING included with this
  25  *  distribution); if not, write to the Free Software Foundation, Inc.,
  26  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  27  */
  28
  29 //====================================================================
  30 //                        Product and Version public settings
  31 //====================================================================
  32
  33 #define PRODUCT_STRING "TAP-Win32 Adapter V8"
  34
  35 #define TAP_NDIS_MAJOR_VERSION 5
  36 #define TAP_NDIS_MINOR_VERSION 0
  37
  38 //===========================================================
  39 // Driver constants
  40 //===========================================================
  41
  42 #define ETHERNET_HEADER_SIZE     (sizeof (ETH_HEADER))
  43 #define ETHERNET_MTU             1500
  44 #define ETHERNET_PACKET_SIZE     (ETHERNET_MTU + ETHERNET_HEADER_SIZE)
  45 #define DEFAULT_PACKET_LOOKAHEAD (ETHERNET_PACKET_SIZE)
  46
  47 #define NIC_MAX_MCAST_LIST 32  // Max length of multicast address list
  48
  49 #define MINIMUM_MTU 576        // USE TCP Minimum MTU
  50 #define MAXIMUM_MTU 65536      // IP maximum MTU
  51
  52 #define PACKET_QUEUE_SIZE   64 // tap -> userspace queue size
  53 #define IRP_QUEUE_SIZE      16 // max number of simultaneous i/o operations from userspace
  54
  55 #define TAP_LITTLE_ENDIAN      // affects ntohs, htonl, etc. functions