FWPS_STREAM_DATA0 structure (fwpsk.h)
The FWPS_STREAM_DATA0 structure describes a portion of a data stream.
Syntax
typedef struct FWPS_STREAM_DATA0_ {
UINT32 flags;
FWPS_STREAM_DATA_OFFSET0 dataOffset;
SIZE_T dataLength;
NET_BUFFER_LIST *netBufferListChain;
} FWPS_STREAM_DATA0;
Members
flags
A variable containing flags that specify the characteristics of the data stream.
For inbound data streams, this can be one or more of the following flags:
FWPS_STREAM_FLAG_RECEIVE
Specifies that the stream is an inbound data stream. This flag is always set for inbound data streams.
FWPS_STREAM_FLAG_RECEIVE_EXPEDITED
Specifies that the inbound data stream contains high-priority out-of-band data.
FWPS_STREAM_FLAG_RECEIVE_DISCONNECT
Specifies that the inbound data has arrived with the FIN flag set in the TCP header. This indicates that the sender has disconnected the stream.
FWPS_STREAM_FLAG_RECEIVE_ABORT
Specifies that the inbound data has arrived with the RST flag set in the TCP header. This indicates that the sender has reset the stream.
For outbound data streams, this can be one or more of the following flags:
FWPS_STREAM_FLAG_SEND
Specifies that the stream is an outbound data stream. This flag is always set for outbound data streams.
FWPS_STREAM_FLAG_SEND_EXPEDITED
Specifies that the outbound data stream contains high-priority out-of-band data.
FWPS_STREAM_FLAG_SEND_NODELAY
Specifies that the sending client requests that the outbound data stream is not to be buffered. If this flag is set, a callout driver should not hold onto the stream buffer any longer than necessary.
FWPS_STREAM_FLAG_SEND_DISCONNECT
Specifies that the stream is to be disconnected after the data in the outbound data stream has been sent. The network stack will set the FIN flag in the TCP header of the last packet that is sent out.
FWPS_STREAM_FLAG_SEND_ABORT
Specifies that the stream is to be reset after the data in the outbound data stream has been sent. The network stack will set the RST flag in the TCP header of the last packet that is sent out. Callout drivers must not call the FwpsStreamInjectAsync0 function to inject data into the stream if this flag is set.
dataOffset
An FWPS_STREAM_DATA_OFFSET0 structure that specifies the offset into the data stream where the portion of the data stream begins.
dataLength
The number of bytes in the portion of the data stream.
netBufferListChain
A pointer to a NET_BUFFER_LIST structure that describes the portion of the data stream.
Remarks
The filter engine uses the FWPS_STREAM_DATA0 structure to describe the portion of a data stream that a callout's classifyFn callout function can process. The dataStream member of the FWPS_STREAM_CALLOUT_IO_PACKET0 structure points to an FWPS_STREAM_DATA0 structure.
Requirements
Requirement | Value |
---|---|
Minimum supported client | Available starting with Windows Vista. |
Header | fwpsk.h (include Fwpsk.h) |