release/src/router/openvpn/tap-win32/constants.h

   1 /*
   2  *  TAP-Win32/TAP-Win64 -- A kernel driver to provide virtual tap
   3  *                         device functionality on Windows.
   4  *
   5  *  This code was inspired by the CIPE-Win32 driver by Damion K. Wilson.
   6  *
   7  *  This source code is Copyright (C) 2002-2009 OpenVPN Technologies, Inc.,
   8  *  and is released under the GPL version 2 (see below).
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License version 2
  12  *  as published by the Free Software Foundation.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program (see the file COPYING included with this
  21  *  distribution); if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 //====================================================================
  26 //                        Product and Version public settings
  27 //====================================================================
  28
  29 #define PRODUCT_STRING PRODUCT_TAP_DEVICE_DESCRIPTION
  30
  31 #define TAP_NDIS_MAJOR_VERSION 5
  32 #define TAP_NDIS_MINOR_VERSION 0
  33
  34 //===========================================================
  35 // Driver constants
  36 //===========================================================
  37
  38 #define ETHERNET_HEADER_SIZE     (sizeof (ETH_HEADER))
  39 #define ETHERNET_MTU             1500
  40 #define ETHERNET_PACKET_SIZE     (ETHERNET_MTU + ETHERNET_HEADER_SIZE)
  41 #define DEFAULT_PACKET_LOOKAHEAD (ETHERNET_PACKET_SIZE)
  42
  43 #define NIC_MAX_MCAST_LIST 32  // Max length of multicast address list
  44
  45 #define MINIMUM_MTU 576        // USE TCP Minimum MTU
  46 #define MAXIMUM_MTU 65536      // IP maximum MTU
  47
  48 #define PACKET_QUEUE_SIZE   64 // tap -> userspace queue size
  49 #define IRP_QUEUE_SIZE      16 // max number of simultaneous i/o operations from userspace
  50 #define INJECT_QUEUE_SIZE   16 // DHCP/ARP -> tap injection queue
  51
  52 #define TAP_LITTLE_ENDIAN      // affects ntohs, htonl, etc. functions