/*

 * pfhook.h

 *

 * Packet filter API

 *

 * This file is part of the w32api package.

 *

 * Contributors:

 *   Created by Casper S. Hornstrup <chorns@users.sourceforge.net>

 *

 * THIS SOFTWARE IS NOT COPYRIGHTED

 *

 * This source code is offered for use in the public domain. You may

 * use, modify or distribute it freely.

 *

 * This code is distributed in the hope that it will be useful but

 * WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY

 * DISCLAIMED. This includes but is not limited to warranties of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

 *

 */

#ifndef __PFHOOK_H

#define __PFHOOK_H

#if __GNUC__ >=3

#pragma GCC system_header

#endif

#ifdef __cplusplus

extern "C" {

#endif

#include "ntddk.h"

#define DD_IPFLTRDRVR_DEVICE_NAME         L"\\Device\\IPFILTERDRIVER"

#define INVALID_PF_IF_INDEX               0xffffffff

#define ZERO_PF_IP_ADDR                   0

typedef ULONG IPAddr;

typedef enum _PF_FORWARD_ACTION {

	PF_FORWARD = 0,

	PF_DROP = 1,

	PF_PASS = 2,

	PF_ICMP_ON_DROP = 3

} PF_FORWARD_ACTION;

typedef PF_FORWARD_ACTION STDCALL

(*PacketFilterExtensionPtr)(

  /*IN*/ unsigned char  *PacketHeader,

  /*IN*/ unsigned char  *Packet, 

  /*IN*/ unsigned int  PacketLength, 

  /*IN*/ unsigned int  RecvInterfaceIndex, 

  /*IN*/ unsigned int  SendInterfaceIndex, 

  /*IN*/ IPAddr  RecvLinkNextHop, 

  /*IN*/ IPAddr  SendLinkNextHop); 

typedef struct _PF_SET_EXTENSION_HOOK_INFO {

  PacketFilterExtensionPtr  ExtensionPointer; 

} PF_SET_EXTENSION_HOOK_INFO, *PPF_SET_EXTENSION_HOOK_INFO;

#define FSCTL_IPFLTRDRVR_BASE             FILE_DEVICE_NETWORK

#define _IPFLTRDRVR_CTL_CODE(function, method, access) \

  CTL_CODE(FSCTL_IPFLTRDRVR_BASE, function, method, access)

#define IOCTL_PF_SET_EXTENSION_POINTER \

  _IPFLTRDRVR_CTL_CODE(22, METHOD_BUFFERED, FILE_WRITE_ACCESS)

#ifdef __cplusplus

}

#endif

#endif /* __PFHOOK_H */