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/*
* TAP-Windows -- A kernel driver to provide virtual tap
* device functionality on Windows.
*
* This code was inspired by the CIPE-Win32 driver by Damion K. Wilson.
*
* This source code is Copyright (C) 2002-2014 OpenVPN Technologies, Inc.,
* and is released under the GPL version 2 (see below).
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
//------------------
// Memory Management
//------------------
PVOID
MemAlloc(
__in ULONG p_Size,
__in BOOLEAN zero
);
VOID
MemFree(
__in PVOID p_Addr,
__in ULONG p_Size
);
//======================================================================
// TAP Packet Queue
//======================================================================
typedef
struct _TAP_PACKET
{
LIST_ENTRY QueueLink;
# define TAP_PACKET_SIZE(data_size) (sizeof (TAP_PACKET) + (data_size))
# define TP_TUN 0x80000000
# define TP_SIZE_MASK (~TP_TUN)
ULONG m_SizeFlags;
// m_Data must be the last struct member
UCHAR m_Data [];
} TAP_PACKET, *PTAP_PACKET;
#define TAP_PACKET_TAG '6PAT' // "TAP6"
typedef struct _TAP_PACKET_QUEUE
{
KSPIN_LOCK QueueLock;
LIST_ENTRY Queue;
ULONG Count; // Count of currently queued items
ULONG MaxCount;
} TAP_PACKET_QUEUE, *PTAP_PACKET_QUEUE;
VOID
tapPacketQueueInsertTail(
__in PTAP_PACKET_QUEUE TapPacketQueue,
__in PTAP_PACKET TapPacket
);
// Call with QueueLock held
PTAP_PACKET
tapPacketRemoveHeadLocked(
__in PTAP_PACKET_QUEUE TapPacketQueue
);
PTAP_PACKET
tapPacketRemoveHead(
__in PTAP_PACKET_QUEUE TapPacketQueue
);
VOID
tapPacketQueueInitialize(
__in PTAP_PACKET_QUEUE TapPacketQueue
);
//----------------------
// Cancel-Safe IRP Queue
//----------------------
typedef struct _TAP_IRP_CSQ
{
IO_CSQ CsqQueue;
KSPIN_LOCK QueueLock;
LIST_ENTRY Queue;
ULONG Count; // Count of currently queued items
ULONG MaxCount;
} TAP_IRP_CSQ, *PTAP_IRP_CSQ;
VOID
tapIrpCsqInitialize(
__in PTAP_IRP_CSQ TapIrpCsq
);
VOID
tapIrpCsqFlush(
__in PTAP_IRP_CSQ TapIrpCsq
);
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