// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of "Eclipse Public License v1.0"

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// Network interface (nif) APIs.

// This file contains all the APIs required to implement a NIF for Symbian OS.

// 

//

/**

 @file NIFIF.H

 @publishedPartner

 @released

*/

#if !defined(__NIFIF_H__)

#define __NIFIF_H__

#define SYMBIAN_NETWORKING_UPS

#include <nifman.h>

#include <comms-infras/nifprvar.h>

#ifndef SYMBIAN_ENABLE_SPLIT_HEADERS

#include <comms-infras/nifif_internal.h>

#endif

/**

 The direction of data transfer

 Currently used by network layers making the PacketActivity() call to specify

 which direction the data was transferred in

 Flags for use with the TNifIfInfo structure

 @defgroup TNifIfInfoflags Flags for TNifIfInfo

 @publishedPartner

 @released

 @since v5.0

 */

//@{

const TUint KNifIfIsBase           = 0x00000001;	//< The object is CNifIfBase-derived (one per protocol, per nif)

const TUint KNifIfIsLink           = 0x00000002;	//< The object is CNifIfLink-derived (one per nif)

const TUint KNifIfUsesNotify       = 0x00000004;	//< The object uses the MNifIfNotify interface

const TUint KNifIfCreatedByFactory = 0x00000008;	//< The object was created by a call to CNifIfFactory

const TUint KNifIfCreatedByLink    = 0x00000010;	//< The object was created by the link layer of the nif (and is usually a binder to a layer 3 protocol)

const TUint KNifIfCreatedAlone     = 0x00000020;	//< The object was created using another mechanism

													//< @note This is typically used for local loopback interfaces, where the interface is created by a means other than the nif factory object

const TUint KNifIfCreatesBinder    = 0x00000040;	//< The object creates other objects to bind to a layer 3 protocol

//@}

enum TDataTransferDirection

/**

 * The direction of data transfer

 * @par

 * Currently used by network layers making the PacketActivity() call to specify which direction the data was transferred in

 *

 * @publishedPartner

 * @released

 * @since v7.0s

 */

	{

	/** Sometime idle timers need to be reset without a packet arriving -

	using this value allows packet counts to be maintained correctly */

	ENoPacket,

	EIncoming,

	/** Leave a gap in case it is necessary to distinguish different sorts of incoming data in the future */

	EOutgoing = 128

	};

// Interface classes

class TNifIfInfo

/**

 * Structure used by a nif to pass information about this object in the nif to the caller.

 * @note Accessed via the CNifIfBase::Info() call, and the CNifIfLink::Info() call, since it is a derived class

 *

 * @publishedPartner

 * @released

 * @since v5.0

 */

	{

public:

	TUint iProtocolSupported;	//< The protocol supported by this object

								//< @note Typically KProtocolInetIp or Inet6Ip for IP binders, K<protocol name>IdEsock for link layer protocols

	TUint iFlags;				//< Flags indicating the class type, reason for creation of this object, interfaces that it uses

								//< @see TNifIfInfoflags

	TVersion iVersion;			//< The version of this object

	TName iName;				//< The "friendly" (for user display, logging) name of the nif

	};

class CNifIfBase;

class MNifIfNotify;

class CNifIfFactory : public CNifFactory

/**

 * The factory object used to create new instances of a nif.

 * A nif is packaged in a dll - nifman will call this class to create new instances of a nif.

 *

 * @publishedPartner

 * @released

 * @since v5.0

 */

	{

friend class CNifMan;

protected:

	/**

	 * Create a new instance of the nif contained within this DLL

	 * @param aName A protocol name supported by the nif

	 * @returns A CNifIfBase-derived object of the requested type

	 * @note The class returned should actually be a CNifIfLink-derived object

	 */

	virtual CNifIfBase *NewInterfaceL(const TDesC& aName)=0;

	/**

	 * Return information about modules within this nif

	 * @param aInfo On return, contains information about a module within the nif

	 * @param aIndex An index into CNifIfBase/CNifIfLink-derived objects in the nif, starting from 0.  It is up to the nif how it assigns indices to objects.

	 * @returns KErrNone if successful; otherwise, one of the standard Symbian OS error codes

	 */

	virtual TInt Info(TNifIfInfo& aInfo, TInt aIndex) const=0;

	IMPORT_C virtual CNifIfBase *NewInterfaceL(const TDesC& aName, MNifIfNotify* aNotify);

	};

class MNifIfNotify

/**

 * Interface from the nif and the protocol layers to Nifman

 * @publishedPartner

 * @released

 */

	{

public:

	enum TAction

	{

		EReconnect,

		ECallBack,

		EDisconnect,

		ENoAction

	};

public:

	/**

	 * Notification from the nif that the link layer has gone down.

	 * @param aReason A Symbian OS error code indicating the reason for the link closing down

	 * @param aAction The action that should be taken as a result of link layer down being signalled

	 */

    virtual void LinkLayerDown(TInt aReason, TAction aAction)=0;

	/**

	 * Notification from the nif that the link layer is up

	 */

	virtual void LinkLayerUp()=0;

	/**

	 * Indicate that link negotiation failed on this nif to allow nifman to take appropriate action

	 * @param aIf The address of the CNifIfBase/Link object for which negotiation failed

	 * @param aReason An error code denoting the reason for failure

	 */

    virtual void NegotiationFailed(CNifIfBase* aIf, TInt aReason)=0;

	/**

	 * Request to the agent to return the data required for authentication

	 * @param aUsername On return, contains the username to be used for authentication

	 * @param aPassword On return, contains the password to be used for authentication

	 * @note The return values in aUsername and aPassword should not be considered valid until CNifIfLink::AuthenticateComplete() has been called

	 */

    virtual TInt Authenticate(TDes& aUsername, TDes& aPassword)=0;

	/**

	 * Request to the agent to cancel a pending authentication

	 */

    virtual void CancelAuthenticate()=0;

	/**

	 * Fetch any excess data from the agent that it received during connection setup

	 * @param aBuffer On return, the buffer contains the excess data from the agent

	 * @returns KErrNone, if successful; otherwise, one of the standard Symbian OS error codes

	 */

	virtual TInt GetExcessData(TDes8& aBuffer)=0;

	/**

	 * Upcall from the nif indicating that a new progress state has been reached on this connection

	 * @pre The stage value is within the range assigned to nifs i.e. KMinNifProgress <= aStage <= KMaxNifProgress

	 * @param aStage The progress stage that has been reached

	 * @param aError Any errors that have occured

	 * @since v5.0

	 */

	virtual void IfProgress(TInt aStage, TInt aError)=0;

	/**

	 * Upcall from the nif indicating that a new progress state has been reached on this subconnection

	 * @pre The stage value is within the range assigned to nifs i.e. KMinNifProgress <= aStage <= KMaxNifProgress

	 * @param aSubConnectionUniqueId The subconnection to which this notification refers

	 * @param aStage The progress stage that has been reached

	 * @param aError Any errors that have occured

	 * @since v7.0s

	 */

	virtual void IfProgress(TSubConnectionUniqueId aSubConnectionUniqueId, TInt aStage, TInt aError)=0;

	/**

	 * Increment the count of users of this nif

	 */

	virtual void OpenRoute()=0;

	/**

	 * Decrement the count of users of this nif

	 */

	virtual void CloseRoute()=0;

	/**

	 * Notification of an event from the nif

	 * @param aEvent The type of event that occured

	 * @param aInfo Any data associated with the event

 	 * @returns KErrNone if successful, otherwise one of the system-wide error codes

	 * @note SC with previous releases broken in v6.1 when first argument changed type

	 */

	virtual TInt Notification(TNifToAgentEventType aEvent, void * aInfo = NULL)=0;

	/**

	 * Notification from the nif that a binder layer has gone down

	 * @param aBinderIf An identifier for the binder layer that went down

	 * @param aReason The reason for the binder layer failure

	 * @param aAction The action to be taken as a result, eg. disconnect, reconnect

	 * @since v7.0s

	 */

	virtual void BinderLayerDown(CNifIfBase* aBinderIf, TInt aReason, TAction aAction)=0;

	/**

 	 * Indication from network layer that a packet has been transmitted or received

	 *

 	 * @param aDirection Whether the packet was transmitted or received

 	 * @param aBytes The size of the packet

 	 * @param aResetTimer Whether the idle timer should be reset

 	 * @returns KErrNone if successful, otherwise one of the system-wide error codes

 	 * @since v7.0s

 	 */

 	virtual TInt PacketActivity(TDataTransferDirection aDirection, TUint aBytes, TBool aResetTimer)=0;

	/**

	 * Indication that the sent bytes threshold for a subconnection has been met or exceeded in the nif

	 *

	 * @param aSubConnectionUniqueId The subconnection to which this notification refers

	 * @param aUplinkVolume The total number of bytes sent by this subconnection

 	 * @since v7.0s

	 */

	virtual void NotifyDataSent(TSubConnectionUniqueId aSubConnectionUniqueId, TUint aUplinkVolume)=0;

	/**

	 * Indication that the received bytes threshold for a subconnection has been met or exceeded in the nif

	 *

	 * @param aSubConnectionUniqueId The subconnection to which this notification refers

	 * @param aDownlinkVolume The total number of bytes sent by this subconnection

 	 * @since v7.0s

	 */

	virtual void NotifyDataReceived(TSubConnectionUniqueId aSubConnectionUniqueId, TUint aDownlinkVolume)=0;

	/**

	 * Indication that some parameter relating to a subconnection has changed in the nif eg. subconnection closed, opened, QoS changed

	 *

	 * @param aEventType The type of event which has occured - used to direct the event notification to the appropriate component(s)

	 * @param aEvent The event which has occured

 	 * @param aEventData Any arguments or additional data to do with the event; the interpretation of this depends on the event

 	 * @param aSource An appropriate identifier of the source of the event - this will be used when one receiver is receiving events from many producers

 	 * @since v7.0s

	 * @todo In the future, migrate GUQoS event handler and agent/nif notifications to this generic event handler - Nifman can then act as an event distributor

	 */

	virtual void NifEvent(TNetworkAdaptorEventType aEventType, TUint aEvent, const TDesC8& aEventData, TAny* aSource=0)=0;

	/**

	 * Read an integer field from the connection settings provider

	 * @param aField The name of the field to read

	 * @param aValue On return, contains the value of the field read

	 * @param aMessage for capability checking

	 * @returns KErrNone, if successful; otherwise one of the standard Symbian OS error codes

	 */

	IMPORT_C TInt ReadInt( const TDesC& aField, TUint32& aValue, const RMessagePtr2* aMessage );

	IMPORT_C TInt ReadInt( const TDesC& aField, TUint32& aValue );

	/**

	 * Write an integer field to the connection settings provider

	 * @param aField The name of the field to which to write

	 * @param aValue The value to be written to the field

	 * @param aMessage for capability checking

	 * @returns KErrNone, if successful; otherwise one of the standard Symbian OS error codes

	 */

	IMPORT_C TInt WriteInt( const TDesC& aField, TUint32 aValue, const RMessagePtr2* aMessage );

	IMPORT_C TInt WriteInt( const TDesC& aField, TUint32 aValue );

	/**

	 * Read a 8-bit descriptor field from the connection settings provider

	 * @param aField The name of the field to read

	 * @param aValue On return, contains the value of the field read

	 * @param aMessage for capability checking

	 * @returns KErrNone, if successful; otherwise one of the standard Symbian OS error codes

	 */

	IMPORT_C TInt ReadDes( const TDesC& aField, TDes8& aValue, const RMessagePtr2* aMessage );

	IMPORT_C TInt ReadDes( const TDesC& aField, TDes8& aValue );

	/**

	 * Write an 8-bit descriptor field to the connection settings provider

	 * @param aField The name of the field to which to write

	 * @param aValue The value to be written to the field

	 * @param aMessage for capability checking

	 * @returns KErrNone, if successful; otherwise one of the standard Symbian OS error codes

	 */

	IMPORT_C TInt WriteDes( const TDesC& aField, const TDesC8& aValue, const RMessagePtr2* aMessage );

	IMPORT_C TInt WriteDes( const TDesC& aField, const TDesC8& aValue );

	/**

	 * Read a 16-bit descriptor field from the connection settings provider

	 * @param aField The name of the field to read

	 * @param aValue On return, contains the value of the field read

	 * @param aMessage for capability checking

	 * @returns KErrNone, if successful; otherwise one of the standard Symbian OS error codes

	 */

	IMPORT_C TInt ReadDes( const TDesC& aField, TDes16& aValue, const RMessagePtr2* aMessage );

	IMPORT_C TInt ReadDes( const TDesC& aField, TDes16& aValue );

	/**

	 * Write an 16-bit descriptor field to the connection settings provider

	 * @param aField The name of the field to which to write

	 * @param aValue The value to be written to the field

	 * @param aMessage for capability checking

	 * @returns KErrNone, if successful; otherwise one of the standard Symbian OS error codes

	 */

	IMPORT_C TInt WriteDes( const TDesC& aField, const TDesC16& aValue, const RMessagePtr2* aMessage );

	IMPORT_C TInt WriteDes( const TDesC& aField, const TDesC16& aValue );

	/**

	 * Read an boolean field from the connection settings provider

	 * @param aField The name of the field to read

	 * @param aValue On return, contains the value of the field read

	 * @param aMessage for capability checking

	 * @returns KErrNone, if successful; otherwise one of the standard Symbian OS error codes

	 */

	IMPORT_C TInt ReadBool( const TDesC& aField, TBool& aValue, const RMessagePtr2* aMessage );

	IMPORT_C TInt ReadBool( const TDesC& aField, TBool& aValue );

	/**

	 * Write an boolean field to the connection settings provider

	 * @param aField The name of the field to which to write

	 * @param aValue The value to be written to the field

	 * @param aMessage for capability checking

	 * @returns KErrNone, if successful; otherwise one of the standard Symbian OS error codes

	 */

	IMPORT_C TInt WriteBool( const TDesC& aField, TBool aValue, const RMessagePtr2* aMessage );

	IMPORT_C TInt WriteBool( const TDesC& aField, TBool aValue );

protected:

	/**

	 * Read an integer field from the connection settings provider

	 * @param aField The name of the field to read

	 * @param aValue On return, contains the value of the field read

	 * @param aMessage for capability checking

	 * @returns KErrNone, if successful; otherwise one of the standard Symbian OS error codes

	 */

	virtual TInt DoReadInt(const TDesC& aField, TUint32& aValue,const RMessagePtr2* aMessage)=0;

	/**

	 * Write an integer field to the connection settings provider

	 * @param aField The name of the field to which to write

	 * @param aValue The value to be written to the field

	 * @param aMessage for capability checking

	 * @returns KErrNone, if successful; otherwise one of the standard Symbian OS error codes

	 */

    virtual TInt DoWriteInt(const TDesC& aField, TUint32 aValue,const RMessagePtr2* aMessage)=0;

	/**

	 * Read a 8-bit descriptor field from the connection settings provider

	 * @param aField The name of the field to read

	 * @param aValue On return, contains the value of the field read

	 * @param aMessage for capability checking

	 * @returns KErrNone, if successful; otherwise one of the standard Symbian OS error codes

	 */

    virtual TInt DoReadDes(const TDesC& aField, TDes8& aValue,const RMessagePtr2* aMessage)=0;

	/**

	 * Read a 16-bit descriptor field from the connection settings provider

	 * @param aField The name of the field to read

	 * @param aValue On return, contains the value of the field read

	 * @param aMessage for capability checking

	 * @returns KErrNone, if successful; otherwise one of the standard Symbian OS error codes

	 */

    virtual TInt DoReadDes(const TDesC& aField, TDes16& aValue,const RMessagePtr2* aMessage)=0;

	/**

	 * Write an 8-bit descriptor field to the connection settings provider

	 * @param aField The name of the field to which to write

	 * @param aValue The value to be written to the field

	 * @param aMessage for capability checking

	 * @returns KErrNone, if successful; otherwise one of the standard Symbian OS error codes

	 */

    virtual TInt DoWriteDes(const TDesC& aField, const TDesC8& aValue,const RMessagePtr2* aMessage)=0;

	/**

	 * Write an 16-bit descriptor field to the connection settings provider

	 * @param aField The name of the field to which to write

	 * @param aValue The value to be written to the field

	 * @param aMessage for capability checking

	 * @returns KErrNone, if successful; otherwise one of the standard Symbian OS error codes

	 */

	virtual TInt DoWriteDes(const TDesC& aField, const TDesC16& aValue,const RMessagePtr2* aMessage)=0;

	/**

	 * Read an boolean field from the connection settings provider

	 * @param aField The name of the field to read

	 * @param aValue On return, contains the value of the field read

	 * @param aMessage for capability checking

	 * @returns KErrNone, if successful; otherwise one of the standard Symbian OS error codes

	 */

	virtual TInt DoReadBool(const TDesC& aField, TBool& aValue,const RMessagePtr2* aMessage)=0;

	/**

	 * Write an boolean field to the connection settings provider

	 * @param aField The name of the field to which to write

	 * @param aValue The value to be written to the field

	 * @param aMessage for capability checking

	 * @returns KErrNone, if successful; otherwise one of the standard Symbian OS error codes

	 */

    virtual TInt DoWriteBool(const TDesC& aField, TBool aValue,const RMessagePtr2* aMessage)=0;

	};

class CNifAgentRef;

class CNifIfLink;

class CNifIfBase : public CBase

/**

 * Base class for nif binder layers.

 * Classes derived from CNifIfBase act as a binder layer to the layer 3 protocol, and send and receive a specified protocol between the network layer and the link layer

 * @note There should be one CNifIfBase object per protocol, per nif instance

 *

 * @publishedPartner

 * @released

 * @since v5.0

 */

	{

friend class CNifMan;

public:

	IMPORT_C CNifIfBase(CNifIfFactory& aFactory);

	IMPORT_C CNifIfBase();

	IMPORT_C ~CNifIfBase();

	IMPORT_C static void Cleanup(TAny* aIf);

	IMPORT_C virtual void Open();

	IMPORT_C virtual void Close();

	IMPORT_C virtual void BindL(TAny *aId);

	IMPORT_C virtual TInt State();

	IMPORT_C virtual TInt Control(TUint aLevel,TUint aName,TDes8& aOption, TAny* aSource=0);

	/**

	 * Retrieve information about an network interface

	 * @param aInfo On return, contains information about the nif

	 */

	virtual void Info(TNifIfInfo& aInfo) const =0;

	/**

	 * Send data through this interface

	 * @param aPdu A packet contained within a RMBufChain

	 * @param aSource A pointer to the object that is sending this data

	 * @returns -ve number	Reserved for future use

	 *			0			Stop sending

	 *			+ve number	Continue sending

	 */

	virtual TInt Send(RMBufChain& aPdu, TAny* aSource=0)=0;

	/**

	 * Notification of an event from the agent

	 * @param aEvent The type of event that occured

	 * @param aInfo Any data associated with the event

 	 * @returns KErrNone if successful, otherwise one of the system-wide error codes

	 * @note SC with previous releases broken in v6.1 when first argument changed type

	 * @since

	 */

	virtual TInt Notification(TAgentToNifEventType aEvent, void * aInfo)=0;

	inline MNifIfNotify* Notify() const;

protected:

	IMPORT_C CNifIfBase(CNifIfLink& aLink);

	TInt iRefCount;

	CNifIfFactory* iFactory;

	MNifIfNotify* iNotify;

	};

class CNifIfLink : public CNifIfBase

/**

 * Interface between nifman and the nif

 * This interface is used by nifman to perform operations on the link layer of the nif - the "reverse" operations (from nif to nifman) are performed on the MNifIfNotify interface

 * @note There should be one CNifIfLink object per nif instance

 * @note Typically the link layer object is CNifIfLink-derived

 *

 * @publishedPartner

 * @released

 * @since v5.0

 */

 	{

public:

	IMPORT_C CNifIfLink(CNifIfFactory& aFactory);

	IMPORT_C virtual void AuthenticateComplete(TInt aResult);

	/**

	 *

	 */

	virtual TInt Start()=0;

	/**

	 *

	 */

	virtual void Stop(TInt aReason, MNifIfNotify::TAction aAction)=0;

	/**

	 *

	 */

	virtual CNifIfBase* GetBinderL(const TDesC& aName)=0;

	IMPORT_C virtual void Restart(CNifIfBase* aIf);

	};