C
typedef struct { PTR_BASE bufferTxStart; PTR_BASE bufferRxStart; PTR_BASE bufferEnd; PTR_BASE txHead; PTR_BASE txTail; PTR_BASE rxHead; PTR_BASE rxTail; DWORD eventTime; WORD eventTime2; union { WORD delayedACKTime; WORD closeWaitTime; } OverlappedTimers; TCP_STATE smState; struct { unsigned char vUnackedKeepalives : 3; unsigned char bServer : 1; unsigned char bTimerEnabled : 1; unsigned char bTimer2Enabled : 1; unsigned char bDelayedACKTimerEnabled : 1; unsigned char bOneSegmentReceived : 1; unsigned char bHalfFullFlush : 1; unsigned char bTXASAP : 1; unsigned char bTXASAPWithoutTimerReset : 1; unsigned char bTXFIN : 1; unsigned char bSocketReset : 1; unsigned char bSSLHandshaking : 1; unsigned char filler : 2; } Flags; WORD_VAL remoteHash; PTR_BASE sslTxHead; PTR_BASE sslRxHead; BYTE sslStubID; BYTE sslReqMessage; BYTE vMemoryMedium; } TCB_STUB;
Description
TCP Control Block (TCB) stub data storage. Stubs are stored in local PIC RAM for speed. Current size is 34 bytes (PIC18), 36 bytes (PIC24/dsPIC), or 56 (PIC32)
Members
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Members |
Description |
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PTR_BASE bufferTxStart; |
First byte of TX buffer |
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PTR_BASE bufferRxStart; |
First byte of RX buffer. TX buffer ends 1 byte prior |
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PTR_BASE bufferEnd; |
Last byte of RX buffer |
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PTR_BASE txHead; |
Head pointer for TX |
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PTR_BASE txTail; |
Tail pointer for TX |
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PTR_BASE rxHead; |
Head pointer for RX |
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PTR_BASE rxTail; |
Tail pointer for RX |
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DWORD eventTime; |
Packet retransmissions, state changes |
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WORD eventTime2; |
Window updates, automatic transmission |
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WORD delayedACKTime; |
Delayed Acknowledgement timer |
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WORD closeWaitTime; |
TCP_CLOSE_WAIT timeout timer |
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TCP_STATE smState; |
State of this socket |
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unsigned char vUnackedKeepalives : 3; |
Count of how many keepalives have been sent with no response |
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unsigned char bServer : 1; |
Socket should return to listening state when closed |
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unsigned char bTimerEnabled : 1; |
Timer is enabled |
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unsigned char bTimer2Enabled : 1; |
Second timer is enabled |
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unsigned char bDelayedACKTimerEnabled : 1; |
DelayedACK timer is enabled |
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unsigned char bOneSegmentReceived : 1; |
A segment has been received |
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unsigned char bHalfFullFlush : 1; |
Flush is for being half full |
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unsigned char bTXASAP : 1; |
Transmit as soon as possible (for Flush) |
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unsigned char bTXASAPWithoutTimerReset : 1; |
Transmit as soon as possible (for Flush), but do not reset retransmission timers |
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unsigned char bTXFIN : 1; |
FIN needs to be transmitted |
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unsigned char bSocketReset : 1; |
Socket has been reset (self-clearing semaphore) |
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unsigned char bSSLHandshaking : 1; |
Socket is in an SSL handshake |
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unsigned char filler : 2; |
Future expansion |
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WORD_VAL remoteHash; |
Consists of remoteIP, remotePort, localPort for connected sockets. It is a localPort number only for listening server sockets. |
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PTR_BASE sslTxHead; |
Position of data being written in next SSL application record Also serves as cache of localSSLPort when smState = TCP_LISTENING |
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PTR_BASE sslRxHead; |
Position of incoming data not yet handled by SSL |
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BYTE sslStubID; |
Which sslStub is associated with this connection |
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BYTE sslReqMessage; |
Currently requested SSL message |
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BYTE vMemoryMedium; |
Which memory medium the TCB is actually stored |