413 lines
13 KiB
C
413 lines
13 KiB
C
|
/* ProtocolLayer.h
|
|||
|
|
*
|
|||
|
|
* Copyright (c) 1994-1995 by DataBeam Corporation, Lexington, KY
|
|||
|
|
*
|
|||
|
|
* Abstract:
|
|||
|
|
* This is the base class and backbone of all of the layers
|
|||
|
|
* in a Transport Stack. This class provides a framework for the basic
|
|||
|
|
* operations expected by a layer in a stack. When all layers inherit
|
|||
|
|
* from this class, they can be linked together and none of the layers
|
|||
|
|
* needs to know who they are connected with.
|
|||
|
|
*
|
|||
|
|
* Caveats:
|
|||
|
|
* None.
|
|||
|
|
*
|
|||
|
|
* Authors:
|
|||
|
|
* James W. Lawwill
|
|||
|
|
*/
|
|||
|
|
#ifndef _PROTOCOL_LAYER_H_
|
|||
|
|
#define _PROTOCOL_LAYER_H_
|
|||
|
|
|
|||
|
|
|
|||
|
|
typedef LEGACY_HANDLE LogicalHandle;
|
|||
|
|
typedef PHYSICAL_HANDLE PhysicalHandle; // hCommLink
|
|||
|
|
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* TransportPriority is passed in with the TConnectRequest() call.
|
|||
|
|
* The user can set the priority of the logical connection. Valid
|
|||
|
|
* priorities are 0-14.
|
|||
|
|
*/
|
|||
|
|
typedef ULONG TransportPriority;
|
|||
|
|
|
|||
|
|
#define DEFAULT_PSTN_CALL_CONTROL PLUGXPRT_PSTN_CALL_CONTROL_PORT_HANDLE
|
|||
|
|
|
|||
|
|
|
|||
|
|
typedef enum
|
|||
|
|
{
|
|||
|
|
PROTOCOL_LAYER_NO_ERROR,
|
|||
|
|
PROTOCOL_LAYER_REGISTRATION_ERROR,
|
|||
|
|
PROTOCOL_LAYER_PACKET_TOO_BIG,
|
|||
|
|
PROTOCOL_LAYER_ERROR
|
|||
|
|
}
|
|||
|
|
ProtocolLayerError;
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
** Message structure used by some classes to hold owner callback
|
|||
|
|
** messages. Sometimes they are processed at later times
|
|||
|
|
*/
|
|||
|
|
typedef struct
|
|||
|
|
{
|
|||
|
|
ULONG message;
|
|||
|
|
void *parameter1;
|
|||
|
|
void *parameter2;
|
|||
|
|
void *parameter3;
|
|||
|
|
}
|
|||
|
|
MessageStruct, * PMessageStruct;
|
|||
|
|
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
** These values make up the data-to-transmit mask. We need a way to
|
|||
|
|
** let the layers know what type of data they can transmit. The controller
|
|||
|
|
** will pass a mask to the layer during the PollTransmitter() call that tells
|
|||
|
|
** the layer if it can transmit CONTROL data, USER data, or both. The layer
|
|||
|
|
** will return a mask telling the controller if it needs to send more
|
|||
|
|
** CONTROL or USER data. It will also tell the controller if it sent any
|
|||
|
|
** data during the call.
|
|||
|
|
*/
|
|||
|
|
#define PROTOCOL_CONTROL_DATA 0x01
|
|||
|
|
#define PROTOCOL_USER_DATA 0x02
|
|||
|
|
#define PROTOCOL_USER_DATA_ONE_PACKET 0x04
|
|||
|
|
#define PROTOCOL_USER_DATA_TRANSMITTED 0x08
|
|||
|
|
|
|||
|
|
#define DEFAULT_PRIORITY 2
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
** Messages passed in owner callbacks
|
|||
|
|
*/
|
|||
|
|
typedef enum
|
|||
|
|
{
|
|||
|
|
NEW_CONNECTION,
|
|||
|
|
BROKEN_CONNECTION,
|
|||
|
|
REQUEST_TRANSPORT_CONNECTION,
|
|||
|
|
|
|||
|
|
TPRT_CONNECT_INDICATION,
|
|||
|
|
TPRT_CONNECT_CONFIRM,
|
|||
|
|
TPRT_DISCONNECT_REQUEST,
|
|||
|
|
TPRT_DISCONNECT_INDICATION,
|
|||
|
|
|
|||
|
|
NETWORK_CONNECT_INDICATION,
|
|||
|
|
NETWORK_CONNECT_CONFIRM,
|
|||
|
|
NETWORK_DISCONNECT_INDICATION,
|
|||
|
|
|
|||
|
|
DATALINK_ESTABLISH_INDICATION,
|
|||
|
|
DATALINK_ESTABLISH_CONFIRM,
|
|||
|
|
DATALINK_RELEASE_INDICATION,
|
|||
|
|
DATALINK_RELEASE_CONFIRM,
|
|||
|
|
|
|||
|
|
T123_FATAL_ERROR,
|
|||
|
|
T123_STATUS_MESSAGE
|
|||
|
|
}
|
|||
|
|
CallbackMessage;
|
|||
|
|
|
|||
|
|
|
|||
|
|
class IProtocolLayer : public IObject
|
|||
|
|
{
|
|||
|
|
public:
|
|||
|
|
|
|||
|
|
virtual ProtocolLayerError DataRequest (
|
|||
|
|
ULONG_PTR identifier,
|
|||
|
|
LPBYTE buffer_address,
|
|||
|
|
ULONG length,
|
|||
|
|
PULong bytes_accepted) = 0;
|
|||
|
|
virtual ProtocolLayerError DataRequest (
|
|||
|
|
ULONG_PTR identifier,
|
|||
|
|
PMemory memory,
|
|||
|
|
PULong bytes_accepted) = 0;
|
|||
|
|
virtual ProtocolLayerError DataIndication (
|
|||
|
|
LPBYTE buffer_address,
|
|||
|
|
ULONG length,
|
|||
|
|
PULong bytes_accepted) = 0;
|
|||
|
|
virtual ProtocolLayerError RegisterHigherLayer (
|
|||
|
|
ULONG_PTR identifier,
|
|||
|
|
PMemoryManager memory_manager,
|
|||
|
|
IProtocolLayer * higher_layer) = 0;
|
|||
|
|
virtual ProtocolLayerError RemoveHigherLayer (
|
|||
|
|
ULONG_PTR identifier) = 0;
|
|||
|
|
virtual ProtocolLayerError PollTransmitter (
|
|||
|
|
ULONG_PTR identifier,
|
|||
|
|
USHORT data_to_transmit,
|
|||
|
|
USHORT * pending_data,
|
|||
|
|
USHORT * holding_data) = 0;
|
|||
|
|
virtual ProtocolLayerError PollReceiver (void) = 0;
|
|||
|
|
virtual ProtocolLayerError GetParameters (
|
|||
|
|
USHORT * max_packet_size,
|
|||
|
|
USHORT * prepend_bytes,
|
|||
|
|
USHORT * append_bytes) = 0;
|
|||
|
|
virtual BOOL PerformAutomaticDisconnect ()
|
|||
|
|
{
|
|||
|
|
return (TRUE);
|
|||
|
|
};
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
#endif
|
|||
|
|
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* Documentation for Public class members
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* ProtocolLayerError ProtocolLayer::DataRequest (
|
|||
|
|
* USHORT identifier,
|
|||
|
|
* LPBYTE buffer_address,
|
|||
|
|
* USHORT length,
|
|||
|
|
* USHORT * bytes_accepted) = 0;
|
|||
|
|
*
|
|||
|
|
* Functional Description
|
|||
|
|
* This function is called by a higher layer to request data to be
|
|||
|
|
* sent out. The function returns the number of bytes accepted from
|
|||
|
|
* the packet. If the layer expects stream data layer, it can accept
|
|||
|
|
* part of the packet. If it is a packet layer, it MUST accept the
|
|||
|
|
* full packet of none of the packet.
|
|||
|
|
*
|
|||
|
|
* Formal Parameters
|
|||
|
|
* identifier - (i) The identifying value of the higher layer
|
|||
|
|
* buffer_address - (i) Address of the packet.
|
|||
|
|
* length - (i) Length of the packet
|
|||
|
|
* bytes_accepted - (o) Number of bytes accepted by the layer.
|
|||
|
|
*
|
|||
|
|
* Return Value
|
|||
|
|
* PROTOCOL_LAYER_NO_ERROR - No error occured
|
|||
|
|
* PROTOCOL_LAYER_ERROR - Generic error
|
|||
|
|
* PROTOCOL_LAYER_PACKET_TOO_BIG - Packet too big
|
|||
|
|
*
|
|||
|
|
* Side Effects
|
|||
|
|
* None
|
|||
|
|
*
|
|||
|
|
* Caveats
|
|||
|
|
* None
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* ProtocolLayerError ProtocolLayer::DataRequest (
|
|||
|
|
* USHORT identifier,
|
|||
|
|
* PMemory memory,
|
|||
|
|
* PULong bytes_accepted) = 0;
|
|||
|
|
*
|
|||
|
|
* Functional Description
|
|||
|
|
* This function is called by a higher layer to request data to be
|
|||
|
|
* sent out. The function returns the number of bytes accepted from
|
|||
|
|
* the packet. If the layer expects stream data layer, it can accept
|
|||
|
|
* part of the packet. If it is a packet layer, it MUST accept the
|
|||
|
|
* full packet of none of the packet. This function does not accept a
|
|||
|
|
* buffer address, but it accepts a memory object. This object holds the
|
|||
|
|
* buffer address and the length.
|
|||
|
|
*
|
|||
|
|
* Formal Parameters
|
|||
|
|
* identifier - (i) The identifying value of the higher layer
|
|||
|
|
* memory - (i) Address of memory object
|
|||
|
|
* bytes_accepted - (o) Number of bytes accepted by the layer.
|
|||
|
|
*
|
|||
|
|
* Return Value
|
|||
|
|
* PROTOCOL_LAYER_NO_ERROR - No error occured
|
|||
|
|
* PROTOCOL_LAYER_ERROR - Generic error
|
|||
|
|
* PROTOCOL_LAYER_PACKET_TOO_BIG - Packet too big
|
|||
|
|
*
|
|||
|
|
* Side Effects
|
|||
|
|
* None
|
|||
|
|
*
|
|||
|
|
* Caveats
|
|||
|
|
* None
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* ProtocolLayerError ProtocolLayer::DataIndication (
|
|||
|
|
* LPBYTE buffer_address,
|
|||
|
|
* USHORT length,
|
|||
|
|
* USHORT * bytes_accepted);
|
|||
|
|
*
|
|||
|
|
* Functional Description
|
|||
|
|
* This function is called by the lower layer when it has data to pass up
|
|||
|
|
*
|
|||
|
|
* Formal Parameters
|
|||
|
|
* buffer_address (i) - Buffer address
|
|||
|
|
* length (i) - Number of bytes available
|
|||
|
|
* bytes_accepted (o) - Number of bytes accepted
|
|||
|
|
*
|
|||
|
|
* Return Value
|
|||
|
|
* PROTOCOL_LAYER_NO_ERROR - No error occured
|
|||
|
|
*
|
|||
|
|
* Side Effects
|
|||
|
|
* None
|
|||
|
|
*
|
|||
|
|
* Caveats
|
|||
|
|
* None
|
|||
|
|
*
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* ProtocolLayerError ProtocolLayer::RegisterHigherLayer (
|
|||
|
|
* USHORT identifier,
|
|||
|
|
* IProtocolLayer * higher_layer);
|
|||
|
|
*
|
|||
|
|
* Functional Description
|
|||
|
|
* This function is called by the higher layer to register its identifier
|
|||
|
|
* and its address. In some cases, the identifier is the DLCI number in
|
|||
|
|
* the packet.
|
|||
|
|
*
|
|||
|
|
* Formal Parameters
|
|||
|
|
* identifier (i) - Identifier used to identify the higher layer
|
|||
|
|
* higher_layer (i) - Address of higher layer
|
|||
|
|
*
|
|||
|
|
* Return Value
|
|||
|
|
* PROTOCOL_LAYER_NO_ERROR - No error occured
|
|||
|
|
* PROTOCOL_LAYER_REGISTRATION_ERROR - Illegal identifier
|
|||
|
|
*
|
|||
|
|
* Side Effects
|
|||
|
|
* None
|
|||
|
|
*
|
|||
|
|
* Caveats
|
|||
|
|
* None
|
|||
|
|
*
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* ProtocolLayerError ProtocollLayer::RemoveHigherLayer (
|
|||
|
|
* USHORT identifier);
|
|||
|
|
*
|
|||
|
|
* Functional Description
|
|||
|
|
* This function is called by the higher layer to remove the higher layer.
|
|||
|
|
* If any more data is received with its identifier on it, it will be
|
|||
|
|
* trashed.
|
|||
|
|
*
|
|||
|
|
* Formal Parameters
|
|||
|
|
* identifier (i) - Identifier used to identify the higher layer
|
|||
|
|
*
|
|||
|
|
* Return Value
|
|||
|
|
* PROTOCOL_LAYER_NO_ERROR - No error occured
|
|||
|
|
* PROTOCOL_LAYER_REGISTRATION_ERROR - Illegal identifier
|
|||
|
|
*
|
|||
|
|
* Side Effects
|
|||
|
|
* None
|
|||
|
|
*
|
|||
|
|
* Caveats
|
|||
|
|
* None
|
|||
|
|
*
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* ProtocolLayerError ProtocolLayer::PollTransmitter (
|
|||
|
|
* USHORT identifier,
|
|||
|
|
* USHORT data_to_transmit,
|
|||
|
|
* USHORT * pending_data);
|
|||
|
|
*
|
|||
|
|
* Functional Description
|
|||
|
|
* This function is called to give the layer a chance transmit data
|
|||
|
|
* in its Data_Request buffer.
|
|||
|
|
*
|
|||
|
|
* Formal Parameters
|
|||
|
|
* identifier (i) - Identifier to poll
|
|||
|
|
* data_to_transmit (i) - This is a mask that tells us to send Control
|
|||
|
|
* data, User data, or both. Since the
|
|||
|
|
* Multiplexer does not differentiate between
|
|||
|
|
* data types it transmits any data it has
|
|||
|
|
* pending_data (o) - Return value to indicat which data is left
|
|||
|
|
* to be transmitted.
|
|||
|
|
*
|
|||
|
|
* Return Value
|
|||
|
|
* PROTOCOL_LAYER_NO_ERROR - No error occured
|
|||
|
|
*
|
|||
|
|
* Side Effects
|
|||
|
|
* None
|
|||
|
|
*
|
|||
|
|
* Caveats
|
|||
|
|
* None
|
|||
|
|
*
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* ProtocolLayerError ProtocolLayer::PollReceiver (
|
|||
|
|
* USHORT identifier);
|
|||
|
|
*
|
|||
|
|
* Functional Description
|
|||
|
|
* This function is called to give the layer a chance pass packets
|
|||
|
|
* to higher layers
|
|||
|
|
*
|
|||
|
|
* Formal Parameters
|
|||
|
|
* identifier (i) - Not used
|
|||
|
|
*
|
|||
|
|
* Return Value
|
|||
|
|
* PROTOCOL_LAYER_NO_ERROR - No error occured
|
|||
|
|
*
|
|||
|
|
* Side Effects
|
|||
|
|
* None
|
|||
|
|
*
|
|||
|
|
* Caveats
|
|||
|
|
* None
|
|||
|
|
*
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* ProtocolLayerError ProtocolLayer::GetParameters (
|
|||
|
|
* USHORT identifier,
|
|||
|
|
* USHORT * max_packet_size);
|
|||
|
|
*
|
|||
|
|
* Functional Description
|
|||
|
|
* This function is called to get the maximum packet size
|
|||
|
|
*
|
|||
|
|
* Formal Parameters
|
|||
|
|
* identifier (i) - Not used
|
|||
|
|
* max_packet_size (o) - Returns the maximum packet size
|
|||
|
|
*
|
|||
|
|
* Return Value
|
|||
|
|
* PROTOCOL_LAYER_NO_ERROR - No error occured
|
|||
|
|
*
|
|||
|
|
* Side Effects
|
|||
|
|
* None
|
|||
|
|
*
|
|||
|
|
* Caveats
|
|||
|
|
* None
|
|||
|
|
*
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* BOOL ProtocolLayer::PerformAutomaticDisconnect (
|
|||
|
|
* void)
|
|||
|
|
*
|
|||
|
|
* Public
|
|||
|
|
*
|
|||
|
|
* Functional Description:
|
|||
|
|
* This function can be used to avoid taking down DLCI0 when the number
|
|||
|
|
* of logical connections handled by a particular stack goes to zero.
|
|||
|
|
* This is a temporary fix that will probably change when the physical
|
|||
|
|
* connection buildup process is handled out of band.
|
|||
|
|
*
|
|||
|
|
* Formal Parameters
|
|||
|
|
* none
|
|||
|
|
*
|
|||
|
|
* Return Value
|
|||
|
|
* TRUE - The base class always returns TRUE. This is the default way
|
|||
|
|
* for a physical connection layer to work.
|
|||
|
|
*
|
|||
|
|
* Side Effects
|
|||
|
|
* None
|
|||
|
|
*
|
|||
|
|
* Caveats
|
|||
|
|
* None
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* PChar ProtocolLayer::GetIdentifier (
|
|||
|
|
* void)
|
|||
|
|
*
|
|||
|
|
* Public
|
|||
|
|
*
|
|||
|
|
* Functional Description:
|
|||
|
|
* This function returns the identifier for the protocol layer. If the
|
|||
|
|
* layer does not override this call a NULL pointer will be returned.
|
|||
|
|
*
|
|||
|
|
* Formal Parameters
|
|||
|
|
* none
|
|||
|
|
*
|
|||
|
|
* Return Value
|
|||
|
|
* A pointer to the identifier of the protocol layer.
|
|||
|
|
*
|
|||
|
|
* Side Effects
|
|||
|
|
* None
|
|||
|
|
*
|
|||
|
|
* Caveats
|
|||
|
|
* None
|
|||
|
|
*/
|
|||
|
|
|