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/*********************************************************************
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*
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* Transmission Control Protocol (TCP) Communications Layer
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* Module for Microchip TCP/IP Stack
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* -Provides reliable, handshaked transport of application stream
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* oriented data with flow control
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* -Reference: RFC 793
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*
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*********************************************************************
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* FileName: TCP.c
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* Dependencies: string.h
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* StackTsk.h
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* Helpers.h
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* IP.h
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* MAC.h
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* ARP.h
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* Tick.h
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* TCP.h
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* Processor: PIC18, PIC24F, PIC24H, dsPIC30F, dsPIC33F
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* Complier: Microchip C18 v3.02 or higher
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* Microchip C30 v2.01 or higher
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* Company: Microchip Technology, Inc.
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*
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* Software License Agreement
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*
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* Copyright © 2002-2007 Microchip Technology Inc. All rights
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* reserved.
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*
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* Microchip licenses to you the right to use, modify, copy, and
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* distribute:
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* (i) the Software when embedded on a Microchip microcontroller or
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* digital signal controller product (“Device”) which is
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* integrated into Licensee’s product; or
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* (ii) ONLY the Software driver source files ENC28J60.c and
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* ENC28J60.h ported to a non-Microchip device used in
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* conjunction with a Microchip ethernet controller for the
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* sole purpose of interfacing with the ethernet controller.
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*
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* You should refer to the license agreement accompanying this
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* Software for additional information regarding your rights and
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* obligations.
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*
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* THE SOFTWARE AND DOCUMENTATION ARE PROVIDED “AS IS” WITHOUT
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* WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT
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* LIMITATION, ANY WARRANTY OF MERCHANTABILITY, FITNESS FOR A
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* PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* MICROCHIP BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES, LOST PROFITS OR LOST DATA, COST OF
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* PROCUREMENT OF SUBSTITUTE GOODS, TECHNOLOGY OR SERVICES, ANY CLAIMS
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* BY THIRD PARTIES (INCLUDING BUT NOT LIMITED TO ANY DEFENSE
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* THEREOF), ANY CLAIMS FOR INDEMNITY OR CONTRIBUTION, OR OTHER
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* SIMILAR COSTS, WHETHER ASSERTED ON THE BASIS OF CONTRACT, TORT
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* (INCLUDING NEGLIGENCE), BREACH OF WARRANTY, OR OTHERWISE.
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*
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*
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* Author Date Comment
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*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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* Nilesh Rajbharti 5/8/01 Original (Rev 1.0)
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* Howard Schlunder 12/11/06 Changed almost everything to
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* better meet RFC 793.
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********************************************************************/
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#define __TCP_C
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#include "TCPIP Stack/TCPIP.h"
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#if defined(STACK_USE_TCP)
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#define MAX_TCP_DATA_LEN (MAC_TX_BUFFER_SIZE - sizeof(TCP_HEADER) - sizeof(IP_HEADER) - sizeof(ETHER_HEADER))
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// TCP Timeout and retransmit numbers
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#define TCP_START_TIMEOUT_VAL ((TICK)TICK_SECOND * (TICK)1)
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#define TCP_TIME_WAIT_TIMEOUT_VAL ((TICK)TICK_SECOND * (TICK)0)
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#define MAX_RETRY_COUNTS (5u)
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#define TCP_AUTO_TRANSMIT_TIMEOUT_VAL ((WORD)(TICK_SECOND/25))
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// TCP Flags defined in RFC
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#define FIN (0x01)
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#define SYN (0x02)
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#define RST (0x04)
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#define PSH (0x08)
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#define ACK (0x10)
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#define URG (0x20)
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// TCP Header
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typedef struct _TCP_HEADER
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{
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WORD SourcePort;
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WORD DestPort;
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DWORD SeqNumber;
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DWORD AckNumber;
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struct
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{
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unsigned char Reserved3 : 4;
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unsigned char Val : 4;
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} DataOffset;
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union
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{
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struct
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{
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unsigned char flagFIN : 1;
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unsigned char flagSYN : 1;
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unsigned char flagRST : 1;
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unsigned char flagPSH : 1;
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unsigned char flagACK : 1;
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unsigned char flagURG : 1;
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unsigned char Reserved2 : 2;
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} bits;
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BYTE byte;
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} Flags;
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WORD Window;
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WORD Checksum;
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WORD UrgentPointer;
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} TCP_HEADER;
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// TCP Options as defined by RFC
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#define TCP_OPTIONS_END_OF_LIST (0x00u)
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#define TCP_OPTIONS_NO_OP (0x01u)
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#define TCP_OPTIONS_MAX_SEG_SIZE (0x02u)
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typedef struct _TCP_OPTIONS
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{
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BYTE Kind;
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BYTE Length;
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WORD_VAL MaxSegSize;
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} TCP_OPTIONS;
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#define SwapPseudoTCPHeader(h) (h.TCPLength = swaps(h.TCPLength))
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// IP pseudo header as defined by RFC 793
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typedef struct _PSEUDO_HEADER
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{
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IP_ADDR SourceAddress;
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IP_ADDR DestAddress;
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BYTE Zero;
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BYTE Protocol;
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WORD TCPLength;
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} PSEUDO_HEADER;
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#define LOCAL_PORT_START_NUMBER (1024u)
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#define LOCAL_PORT_END_NUMBER (5000u)
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// Local temp port numbers.
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#ifdef STACK_CLIENT_MODE
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static WORD NextPort __attribute__((persistent));
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#endif
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#if defined(HI_TECH_C)
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// The initializer forces this large array out of the bss section
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// so we can link correctly.
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TCB_STUB TCBStubs[MAX_TCP_SOCKETS] = {'\0'};
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#else
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// The TCB array is very large. With the C18 compiler, one must
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// modify the linker script to make an array that spans more than
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// one memory bank. To do this, make the necessary changes to your
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// processor's linker script (.lkr). Here is an example showing
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// gpr11 and 128 bytes of gpr12 being combined into one 384 byte
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// block used exclusively by the TCB_MEM data section:
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// ...
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// //DATABANK NAME=gpr11 START=0xB00 END=0xBFF
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// //DATABANK NAME=gpr12 START=0xC00 END=0xCFF
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// DATABANK NAME=gpr11b START=0xB00 END=0xC7F PROTECTED
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// DATABANK NAME=gpr12 START=0xC80 END=0xCFF
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// ...
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// SECTION NAME=TCP_TCB_RAM RAM=gpr11b
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// ...
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#pragma udata TCB_uRAM
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TCB_STUB TCBStubs[MAX_TCP_SOCKETS];
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#pragma udata // Return to any other RAM section
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#endif
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static TCB MyTCB;
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//static TCP_SOCKET hCurrentTCB = 0;
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static void HandleTCPSeg(TCP_SOCKET hTCP, TCP_HEADER *h, WORD len);
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static void SendTCP(TCP_SOCKET hTCP, BYTE flags);
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static TCP_SOCKET FindMatchingSocket(TCP_HEADER *h, NODE_INFO *remote);
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static void SwapTCPHeader(TCP_HEADER* header);
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static void CloseSocket(TCP_SOCKET hTCP);
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static void LoadTCB(TCP_SOCKET hTCP);
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static void SaveTCB(TCP_SOCKET hTCP);
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static BYTE ProcessRXBytes(TCB_STUB *ps, TCP_HEADER *h, WORD len);
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static void LoadTCB(TCP_SOCKET hTCP)
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{
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WORD PtrSave;
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// if(hCurrentTCB == hTCP)
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// return;
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// Load up the new TCB
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// hCurrentTCB = hTCP;
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PtrSave = MACSetReadPtr(TCBStubs[hTCP].bufferTxStart - sizeof(MyTCB));
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MACGetArray((BYTE*)&MyTCB, sizeof(MyTCB));
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MACSetReadPtr(PtrSave);
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}
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static void SaveTCB(TCP_SOCKET hTCP)
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{
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WORD PtrSave;
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// hCurrentTCB = hTCP;
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// Save the current TCB
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PtrSave = MACSetWritePtr(TCBStubs[hTCP].bufferTxStart - sizeof(MyTCB));
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MACPutArray((BYTE*)&MyTCB, sizeof(MyTCB));
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MACSetWritePtr(PtrSave);
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}
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/*********************************************************************
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* Function: void TCPInit(void)
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*
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* PreCondition: None
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*
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* Input: None
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*
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* Output: TCP is initialized.
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*
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* Side Effects: None
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*
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* Overview: Initialize all socket states
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*
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* Note: This function is called only once during lifetime
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* of the application.
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********************************************************************/
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void TCPInit(void)
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{
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TCP_SOCKET hTCP;
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TCB_STUB *ps;
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// Initialize all sockets.
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for(hTCP = 0; hTCP < MAX_TCP_SOCKETS; hTCP++)
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{
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ps = &TCBStubs[hTCP];
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ps->smState = TCP_CLOSED;
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ps->bufferTxStart = BASE_TCB_ADDR + sizeof(TCB) + hTCP*(sizeof(TCB) + (TCP_TX_FIFO_SIZE+1) + (TCP_RX_FIFO_SIZE+1));
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ps->bufferRxStart = ps->bufferTxStart + TCP_TX_FIFO_SIZE+1;
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ps->bufferEnd = ps->bufferRxStart + TCP_RX_FIFO_SIZE;
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ps->Flags.bServer = FALSE;
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ps->Flags.bTimerEnabled = FALSE;
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ps->Flags.bTimer2Enabled = FALSE;
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ps->Flags.bDelayedACKTimerEnabled = FALSE;
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ps->Flags.bOneSegmentReceived = FALSE;
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ps->Flags.bHalfFullFlush = FALSE;
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ps->Flags.bTXASAP = FALSE;
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}
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// Initialize random number generator
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srand((WORD)TickGet());
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}
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/*********************************************************************
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* Function: TCP_SOCKET TCPListen(WORD port)
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*
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* PreCondition: TCPInit() is already called.
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*
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* Input: port - A TCP port to be opened.
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*
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* Output: Given port is opened and returned on success
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* INVALID_SOCKET if no more sockets left.
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*
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* Side Effects: None
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*
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* Overview: None
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*
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* Note: None
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********************************************************************/
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TCP_SOCKET TCPListen(WORD port)
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{
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TCP_SOCKET hTCP;
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TCB_STUB *ps;
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for(hTCP = 0; hTCP < MAX_TCP_SOCKETS; hTCP++)
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{
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ps = &TCBStubs[hTCP];
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if(ps->smState == TCP_CLOSED)
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{
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ps->Flags.bServer = TRUE;
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ps->smState = TCP_LISTEN;
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ps->remoteHash.Val = port;
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ps->txTail = ps->bufferTxStart;
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ps->txHead = ps->bufferTxStart;
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ps->rxTail = ps->bufferRxStart;
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ps->rxHead = ps->bufferRxStart;
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MyTCB.sHoleSize = -1;
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MyTCB.localPort.Val = port;
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MyTCB.txUnackedTail = ps->bufferTxStart;
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((DWORD_VAL*)(&MyTCB.MySEQ))->w[0] = rand();
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((DWORD_VAL*)(&MyTCB.MySEQ))->w[1] = rand();
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SaveTCB(hTCP);
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return hTCP;
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}
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}
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return INVALID_SOCKET;
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}
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/*********************************************************************
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* FunctionL BOOL TCPGetRemoteInfo(TCP_SOCKET hTCP, SOCKET_INFO *RemoteInfo)
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*
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* PreCondition: TCPInit() is already called.
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*
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* Input: hTCP - Handle of socket to read
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*
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* Output: A new socket is created, connection request is
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* sent and socket handle is returned.
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*
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* Side Effects: None
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*
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* Overview: None
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*
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* Note: None
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*
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********************************************************************/
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SOCKET_INFO* TCPGetRemoteInfo(TCP_SOCKET hTCP)
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{
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static SOCKET_INFO RemoteInfo;
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LoadTCB(hTCP);
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memcpy((void*)&RemoteInfo.remote, (void*)&MyTCB.remote, sizeof(NODE_INFO));
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RemoteInfo.remotePort.Val = MyTCB.remotePort.Val;
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return &RemoteInfo;
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}
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/*********************************************************************
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* Function: TCP_SOCKET TCPConnect(NODE_INFO* remote,
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* WORD remotePort)
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*
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* PreCondition: TCPInit() is already called.
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*
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* Input: remote - Remote node address info
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* remotePort - remote port to be connected.
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*
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* Output: A new socket is created, connection request is
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* sent and socket handle is returned.
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*
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| 353 |
* Side Effects: None
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| 354 |
*
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| 355 |
* Overview: None
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| 356 |
*
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| 357 |
* Note: By default this function is not included in
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* source. You must define STACK_CLIENT_MODE to
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| 359 |
* be able to use this function.
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********************************************************************/
|
| 361 |
#ifdef STACK_CLIENT_MODE
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TCP_SOCKET TCPConnect(NODE_INFO *remote, WORD remotePort)
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{
|
| 364 |
TCP_SOCKET hTCP;
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TCB_STUB *ps;
|
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|
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// Find an available socket
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for(hTCP = 0; hTCP < MAX_TCP_SOCKETS; hTCP++)
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{
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| 370 |
ps = &TCBStubs[hTCP];
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| 372 |
if(ps->smState != TCP_CLOSED)
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continue;
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| 374 |
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| 375 |
// Zero out the TCB
|
| 376 |
memset((BYTE*)&MyTCB, 0x00, sizeof(MyTCB));
|
| 377 |
|
| 378 |
// Each new socket that is opened by this node, gets the
|
| 379 |
// next sequential port number.
|
| 380 |
if(NextPort < LOCAL_PORT_START_NUMBER || NextPort > LOCAL_PORT_END_NUMBER)
|
| 381 |
NextPort = LOCAL_PORT_START_NUMBER;
|
| 382 |
|
| 383 |
// Set the non-zero TCB fields
|
| 384 |
MyTCB.sHoleSize = -1;
|
| 385 |
MyTCB.localPort.Val = NextPort++;
|
| 386 |
MyTCB.remotePort.Val = remotePort;
|
| 387 |
memcpy((void*)&MyTCB.remote, (void*)remote, sizeof(NODE_INFO));
|
| 388 |
((DWORD_VAL*)(&MyTCB.MySEQ))->w[0] = rand();
|
| 389 |
((DWORD_VAL*)(&MyTCB.MySEQ))->w[1] = rand();
|
| 390 |
MyTCB.retryCount = 0;
|
| 391 |
MyTCB.retryInterval = TCP_START_TIMEOUT_VAL;
|
| 392 |
|
| 393 |
// Zero out the buffer contents
|
| 394 |
MyTCB.txUnackedTail = ps->bufferTxStart;
|
| 395 |
ps->txHead = ps->bufferTxStart;
|
| 396 |
ps->txTail = ps->bufferTxStart;
|
| 397 |
ps->rxHead = ps->bufferRxStart;
|
| 398 |
ps->rxTail = ps->bufferRxStart;
|
| 399 |
|
| 400 |
// Update the TCB Stub
|
| 401 |
ps->remoteHash.Val = (remote->IPAddr.w[1]+remote->IPAddr.w[0] + remotePort) ^ MyTCB.localPort.Val;
|
| 402 |
ps->smState = TCP_SYN_SENT;
|
| 403 |
ps->eventTime = TickGet() + TCP_START_TIMEOUT_VAL;
|
| 404 |
ps->Flags.bTimerEnabled = TRUE;
|
| 405 |
|
| 406 |
// Save the TCB
|
| 407 |
SaveTCB(hTCP);
|
| 408 |
|
| 409 |
// Send TCP SYNchronize (connect) request
|
| 410 |
SendTCP(hTCP, SYN);
|
| 411 |
|
| 412 |
return hTCP;
|
| 413 |
}
|
| 414 |
|
| 415 |
// If there is no socket available, return error.
|
| 416 |
return INVALID_SOCKET;
|
| 417 |
}
|
| 418 |
#endif
|
| 419 |
|
| 420 |
|
| 421 |
|
| 422 |
/*********************************************************************
|
| 423 |
* Function: BOOL TCPIsConnected(TCP_SOCKET hTCP)
|
| 424 |
*
|
| 425 |
* PreCondition: TCPInit() is already called.
|
| 426 |
*
|
| 427 |
* Input: hTCP - Socket to be checked for connection.
|
| 428 |
*
|
| 429 |
* Output: TRUE if given socket is connected
|
| 430 |
* FALSE if given socket is not connected.
|
| 431 |
*
|
| 432 |
* Side Effects: None
|
| 433 |
*
|
| 434 |
* Overview: None
|
| 435 |
*
|
| 436 |
* Note: A socket is said to be connected only if it is in
|
| 437 |
* the TCP_ESTABLISHED state
|
| 438 |
********************************************************************/
|
| 439 |
BOOL TCPIsConnected(TCP_SOCKET hTCP)
|
| 440 |
{
|
| 441 |
return TCBStubs[hTCP].smState == TCP_ESTABLISHED;
|
| 442 |
}
|
| 443 |
|
| 444 |
|
| 445 |
|
| 446 |
/*********************************************************************
|
| 447 |
* Function: void TCPDisconnect(TCP_SOCKET hTCP)
|
| 448 |
*
|
| 449 |
* PreCondition: TCPInit() is already called
|
| 450 |
*
|
| 451 |
* Input: hTCP - Socket to be disconnected.
|
| 452 |
*
|
| 453 |
* Output: A disconnect request is sent for given socket.
|
| 454 |
* This function does nothing if the socket isn't
|
| 455 |
* currently connected.
|
| 456 |
*
|
| 457 |
* Side Effects: None
|
| 458 |
*
|
| 459 |
* Overview: None
|
| 460 |
*
|
| 461 |
* Note: None
|
| 462 |
********************************************************************/
|
| 463 |
void TCPDisconnect(TCP_SOCKET hTCP)
|
| 464 |
{
|
| 465 |
TCB_STUB *ps;
|
| 466 |
|
| 467 |
ps = &TCBStubs[hTCP];
|
| 468 |
LoadTCB(hTCP);
|
| 469 |
|
| 470 |
switch(ps->smState)
|
| 471 |
{
|
| 472 |
//case TCP_CLOSED:
|
| 473 |
//case TCP_LISTEN:
|
| 474 |
//case TCP_LAST_ACK:
|
| 475 |
//case TCP_FIN_WAIT_1:
|
| 476 |
//case TCP_FIN_WAIT_2:
|
| 477 |
//case TCP_CLOSING:
|
| 478 |
//case TCP_TIME_WAIT:
|
| 479 |
// return;
|
| 480 |
|
| 481 |
case TCP_SYN_SENT:
|
| 482 |
CloseSocket(hTCP);
|
| 483 |
break;
|
| 484 |
|
| 485 |
case TCP_SYN_RECEIVED:
|
| 486 |
case TCP_ESTABLISHED:
|
| 487 |
MyTCB.MySEQ++;
|
| 488 |
SendTCP(hTCP, FIN | ACK);
|
| 489 |
ps->smState = TCP_FIN_WAIT_1;
|
| 490 |
// Clear timeout info
|
| 491 |
MyTCB.retryCount = 0;
|
| 492 |
MyTCB.retryInterval = TCP_START_TIMEOUT_VAL;
|
| 493 |
ps->eventTime = TickGet() + TCP_START_TIMEOUT_VAL;
|
| 494 |
ps->Flags.bTimerEnabled = TRUE;
|
| 495 |
break;
|
| 496 |
|
| 497 |
case TCP_CLOSE_WAIT:
|
| 498 |
MyTCB.MySEQ++;
|
| 499 |
SendTCP(hTCP, FIN | ACK);
|
| 500 |
ps->smState = TCP_LAST_ACK;
|
| 501 |
// Clear timeout info
|
| 502 |
MyTCB.retryCount = 0;
|
| 503 |
MyTCB.retryInterval = TCP_START_TIMEOUT_VAL;
|
| 504 |
ps->eventTime = TickGet() + TCP_START_TIMEOUT_VAL;
|
| 505 |
ps->Flags.bTimerEnabled = TRUE;
|
| 506 |
break;
|
| 507 |
}
|
| 508 |
|
| 509 |
SaveTCB(hTCP);
|
| 510 |
}
|
| 511 |
|
| 512 |
/*********************************************************************
|
| 513 |
* Function: void TCPFlush(TCP_SOCKET hTCP)
|
| 514 |
*
|
| 515 |
* PreCondition: TCPInit() is already called.
|
| 516 |
*
|
| 517 |
* Input: s - Socket whose data is to be transmitted.
|
| 518 |
*
|
| 519 |
* Output: None
|
| 520 |
*
|
| 521 |
* Side Effects: None
|
| 522 |
*
|
| 523 |
* Overview: None
|
| 524 |
*
|
| 525 |
* Note: None
|
| 526 |
********************************************************************/
|
| 527 |
void TCPFlush(TCP_SOCKET hTCP)
|
| 528 |
{
|
| 529 |
TCB_STUB *ps;
|
| 530 |
|
| 531 |
ps = &TCBStubs[hTCP];
|
| 532 |
LoadTCB(hTCP);
|
| 533 |
|
| 534 |
if(ps->txHead != MyTCB.txUnackedTail)
|
| 535 |
{
|
| 536 |
SendTCP(hTCP, PSH | ACK);
|
| 537 |
|
| 538 |
// Clear timeout info
|
| 539 |
MyTCB.retryCount = 0;
|
| 540 |
MyTCB.retryInterval = TCP_START_TIMEOUT_VAL;
|
| 541 |
ps->eventTime = TickGet() + TCP_START_TIMEOUT_VAL;
|
| 542 |
ps->Flags.bTimerEnabled = TRUE;
|
| 543 |
}
|
| 544 |
SaveTCB(hTCP);
|
| 545 |
}
|
| 546 |
|
| 547 |
|
| 548 |
|
| 549 |
/*********************************************************************
|
| 550 |
* Function: WORD TCPIsPutReady(TCP_SOCKET hTCP)
|
| 551 |
*
|
| 552 |
* PreCondition: TCPInit() is already called.
|
| 553 |
*
|
| 554 |
* Input: hTCP: handle of socket to test
|
| 555 |
*
|
| 556 |
* Output: Number of bytes that can be immediately placed
|
| 557 |
* in the transmit buffer.
|
| 558 |
*
|
| 559 |
* Side Effects: None
|
| 560 |
*
|
| 561 |
* Overview: None
|
| 562 |
*
|
| 563 |
* Note: None
|
| 564 |
********************************************************************/
|
| 565 |
WORD TCPIsPutReady(TCP_SOCKET hTCP)
|
| 566 |
{
|
| 567 |
TCB_STUB *ps;
|
| 568 |
|
| 569 |
ps = &TCBStubs[hTCP];
|
| 570 |
|
| 571 |
// Unconnected sockets shouldn't be transmitting anything.
|
| 572 |
if(!((ps->smState == TCP_ESTABLISHED) || (ps->smState == TCP_CLOSE_WAIT)))
|
| 573 |
return 0;
|
| 574 |
|
| 575 |
// Calculate the free space in this socket's TX FIFO
|
| 576 |
if(ps->txHead >= ps->txTail)
|
| 577 |
return (ps->bufferRxStart - ps->bufferTxStart - 1) - (ps->txHead - ps->txTail);
|
| 578 |
else
|
| 579 |
return ps->txTail - ps->txHead - 1;
|
| 580 |
}
|
| 581 |
|
| 582 |
|
| 583 |
/*********************************************************************
|
| 584 |
* Function: BOOL TCPPut(TCP_SOCKET hTCP, BYTE byte)
|
| 585 |
*
|
| 586 |
* PreCondition: TCPIsPutReady(s) != 0
|
| 587 |
*
|
| 588 |
* Input: hTCP: socket handle to use
|
| 589 |
* byte: a data byte to send
|
| 590 |
*
|
| 591 |
* Output: TRUE if given byte was put in transmit buffer
|
| 592 |
* FALSE if transmit buffer is full.
|
| 593 |
*
|
| 594 |
* Side Effects: None
|
| 595 |
*
|
| 596 |
* Overview: None
|
| 597 |
*
|
| 598 |
* Note: None
|
| 599 |
********************************************************************/
|
| 600 |
BOOL TCPPut(TCP_SOCKET hTCP, BYTE byte)
|
| 601 |
{
|
| 602 |
TCB_STUB *ps;
|
| 603 |
WORD wFreeTXSpace;
|
| 604 |
|
| 605 |
ps = &TCBStubs[hTCP];
|
| 606 |
|
| 607 |
wFreeTXSpace = TCPIsPutReady(hTCP);
|
| 608 |
if(wFreeTXSpace == 0u)
|
| 609 |
return FALSE;
|
| 610 |
else if(wFreeTXSpace == 1u) // About to run out of space, lets transmit so the remote node might send an ACK back faster
|
| 611 |
TCPFlush(hTCP);
|
| 612 |
|
| 613 |
// Send all current bytes if we are crossing half full
|
| 614 |
// This is required to improve performance with the delayed
|
| 615 |
// acknowledgement algorithm
|
| 616 |
if((!ps->Flags.bHalfFullFlush) && (wFreeTXSpace <= ((ps->bufferRxStart-ps->bufferTxStart)>>1)))
|
| 617 |
{
|
| 618 |
TCPFlush(hTCP);
|
| 619 |
ps->Flags.bHalfFullFlush = TRUE;
|
| 620 |
}
|
| 621 |
|
| 622 |
MACSetWritePtr(ps->txHead);
|
| 623 |
MACPut(byte);
|
| 624 |
if(++ps->txHead >= ps->bufferRxStart)
|
| 625 |
ps->txHead = ps->bufferTxStart;
|
| 626 |
|
| 627 |
// Send the last byte as a separate packet (likely will make the remote node send back ACK faster)
|
| 628 |
if(wFreeTXSpace == 1u)
|
| 629 |
TCPFlush(hTCP);
|
| 630 |
|
| 631 |
// If not already enabled, start a timer so this data will
|
| 632 |
// eventually get sent even if the application doens't call
|
| 633 |
// TCPFlush()
|
| 634 |
if(!ps->Flags.bTimer2Enabled)
|
| 635 |
{
|
| 636 |
ps->Flags.bTimer2Enabled = TRUE;
|
| 637 |
ps->eventTime2 = (WORD)TickGet() + TCP_AUTO_TRANSMIT_TIMEOUT_VAL;
|
| 638 |
}
|
| 639 |
|
| 640 |
return TRUE;
|
| 641 |
}
|
| 642 |
|
| 643 |
/*********************************************************************
|
| 644 |
* Function: WORD TCPPutArray(TCP_SOCKET hTCP, BYTE *data, WORD len)
|
| 645 |
*
|
| 646 |
* PreCondition: None
|
| 647 |
*
|
| 648 |
* Input: hTCP - Socket handle to use
|
| 649 |
* data - Pointer to data to put
|
| 650 |
* len - Count of bytes to put
|
| 651 |
*
|
| 652 |
* Output: Count of bytes actually placed in the TX buffer
|
| 653 |
*
|
| 654 |
* Side Effects: None
|
| 655 |
*
|
| 656 |
* Overview: None
|
| 657 |
*
|
| 658 |
* Note: None
|
| 659 |
********************************************************************/
|
| 660 |
WORD TCPPutArray(TCP_SOCKET hTCP, BYTE *data, WORD len)
|
| 661 |
{
|
| 662 |
WORD wActualLen;
|
| 663 |
WORD wFreeTXSpace;
|
| 664 |
WORD wRightLen = 0;
|
| 665 |
TCB_STUB *ps;
|
| 666 |
|
| 667 |
ps = &TCBStubs[hTCP];
|
| 668 |
|
| 669 |
wFreeTXSpace = TCPIsPutReady(hTCP);
|
| 670 |
if(wFreeTXSpace == 0u)
|
| 671 |
{
|
| 672 |
TCPFlush(hTCP);
|
| 673 |
return 0;
|
| 674 |
}
|
| 675 |
|
| 676 |
wActualLen = wFreeTXSpace;
|
| 677 |
if(wFreeTXSpace > len)
|
| 678 |
wActualLen = len;
|
| 679 |
|
| 680 |
// Send all current bytes if we are crossing half full
|
| 681 |
// This is required to improve performance with the delayed
|
| 682 |
// acknowledgement algorithm
|
| 683 |
if((!ps->Flags.bHalfFullFlush) && (wFreeTXSpace <= ((ps->bufferRxStart-ps->bufferTxStart)>>1)))
|
| 684 |
{
|
| 685 |
TCPFlush(hTCP);
|
| 686 |
ps->Flags.bHalfFullFlush = TRUE;
|
| 687 |
}
|
| 688 |
|
| 689 |
// See if we need a two part put
|
| 690 |
if(ps->txHead + wActualLen >= ps->bufferRxStart)
|
| 691 |
{
|
| 692 |
wRightLen = ps->bufferRxStart-ps->txHead;
|
| 693 |
MACSetWritePtr(ps->txHead);
|
| 694 |
MACPutArray(data, wRightLen);
|
| 695 |
data += wRightLen;
|
| 696 |
wActualLen -= wRightLen;
|
| 697 |
ps->txHead = ps->bufferTxStart;
|
| 698 |
}
|
| 699 |
|
| 700 |
MACSetWritePtr(ps->txHead);
|
| 701 |
MACPutArray(data, wActualLen);
|
| 702 |
ps->txHead += wActualLen;
|
| 703 |
|
| 704 |
// Send these bytes right now if we are out of TX buffer space
|
| 705 |
if(wFreeTXSpace <= len)
|
| 706 |
TCPFlush(hTCP);
|
| 707 |
|
| 708 |
// If not already enabled, start a timer so this data will
|
| 709 |
// eventually get sent even if the application doens't call
|
| 710 |
// TCPFlush()
|
| 711 |
if(!ps->Flags.bTimer2Enabled)
|
| 712 |
{
|
| 713 |
ps->Flags.bTimer2Enabled = TRUE;
|
| 714 |
ps->eventTime2 = (WORD)TickGet() + TCP_AUTO_TRANSMIT_TIMEOUT_VAL;
|
| 715 |
}
|
| 716 |
|
| 717 |
return wActualLen + wRightLen;
|
| 718 |
}
|
| 719 |
|
| 720 |
WORD TCPPutROMArray(TCP_SOCKET hTCP, ROM BYTE *data, WORD len)
|
| 721 |
{
|
| 722 |
WORD wActualLen;
|
| 723 |
WORD wFreeTXSpace;
|
| 724 |
WORD wRightLen = 0;
|
| 725 |
TCB_STUB *ps;
|
| 726 |
|
| 727 |
ps = &TCBStubs[hTCP];
|
| 728 |
|
| 729 |
wFreeTXSpace = TCPIsPutReady(hTCP);
|
| 730 |
if(wFreeTXSpace == 0u)
|
| 731 |
{
|
| 732 |
TCPFlush(hTCP);
|
| 733 |
return 0;
|
| 734 |
}
|
| 735 |
|
| 736 |
// Send all current bytes if we are crossing half full
|
| 737 |
// This is required to improve performance with the delayed
|
| 738 |
// acknowledgement algorithm
|
| 739 |
if((!ps->Flags.bHalfFullFlush) && (wFreeTXSpace <= ((ps->bufferRxStart-ps->bufferTxStart)>>1)))
|
| 740 |
{
|
| 741 |
TCPFlush(hTCP);
|
| 742 |
ps->Flags.bHalfFullFlush = TRUE;
|
| 743 |
}
|
| 744 |
|
| 745 |
wActualLen = wFreeTXSpace;
|
| 746 |
if(wFreeTXSpace > len)
|
| 747 |
wActualLen = len;
|
| 748 |
|
| 749 |
// See if we need a two part put
|
| 750 |
if(ps->txHead + wActualLen >= ps->bufferRxStart)
|
| 751 |
{
|
| 752 |
wRightLen = ps->bufferRxStart-ps->txHead;
|
| 753 |
MACSetWritePtr(ps->txHead);
|
| 754 |
MACPutROMArray(data, wRightLen);
|
| 755 |
data += wRightLen;
|
| 756 |
wActualLen -= wRightLen;
|
| 757 |
ps->txHead = ps->bufferTxStart;
|
| 758 |
}
|
| 759 |
|
| 760 |
MACSetWritePtr(ps->txHead);
|
| 761 |
MACPutROMArray(data, wActualLen);
|
| 762 |
ps->txHead += wActualLen;
|
| 763 |
|
| 764 |
// Send these bytes right now if we are out of TX buffer space
|
| 765 |
if(wFreeTXSpace <= len)
|
| 766 |
TCPFlush(hTCP);
|
| 767 |
|
| 768 |
// If not already enabled, start a timer so this data will
|
| 769 |
// eventually get sent even if the application doens't call
|
| 770 |
// TCPFlush()
|
| 771 |
if(!ps->Flags.bTimer2Enabled)
|
| 772 |
{
|
| 773 |
ps->Flags.bTimer2Enabled = TRUE;
|
| 774 |
ps->eventTime2 = (WORD)TickGet() + TCP_AUTO_TRANSMIT_TIMEOUT_VAL;
|
| 775 |
}
|
| 776 |
|
| 777 |
return wActualLen + wRightLen;
|
| 778 |
}
|
| 779 |
|
| 780 |
|
| 781 |
/*********************************************************************
|
| 782 |
* Function: WORD TCPPutString(TCP_SOCKET hTCP, BYTE *data)
|
| 783 |
*
|
| 784 |
* PreCondition: None
|
| 785 |
*
|
| 786 |
* Input: hTCP - Socket handle to use
|
| 787 |
* data - Pointer to null terminated string to put
|
| 788 |
*
|
| 789 |
* Output: BYTE* - *data pointer incremented by the number of
|
| 790 |
* bytes actually placed in the TX FIFO
|
| 791 |
*
|
| 792 |
* Side Effects: None
|
| 793 |
*
|
| 794 |
* Overview: None
|
| 795 |
*
|
| 796 |
* Note: None
|
| 797 |
********************************************************************/
|
| 798 |
BYTE* TCPPutString(TCP_SOCKET hTCP, BYTE *data)
|
| 799 |
{
|
| 800 |
return data + TCPPutArray(hTCP, data, strlen((char*)data));
|
| 801 |
}
|
| 802 |
|
| 803 |
ROM BYTE* TCPPutROMString(TCP_SOCKET hTCP, ROM BYTE *data)
|
| 804 |
{
|
| 805 |
return data + TCPPutROMArray(hTCP, data, strlenpgm((ROM char*)data));
|
| 806 |
}
|
| 807 |
|
| 808 |
|
| 809 |
/*********************************************************************
|
| 810 |
* Function: void TCPDiscard(TCP_SOCKET hTCP)
|
| 811 |
*
|
| 812 |
* PreCondition: TCPInit() is already called.
|
| 813 |
*
|
| 814 |
* Input: hTCP - socket handle
|
| 815 |
*
|
| 816 |
* Output: None
|
| 817 |
*
|
| 818 |
* Side Effects: None
|
| 819 |
*
|
| 820 |
* Overview: Removes all pending data from the socket's RX
|
| 821 |
* FIFO.
|
| 822 |
*
|
| 823 |
* Note: None
|
| 824 |
********************************************************************/
|
| 825 |
void TCPDiscard(TCP_SOCKET hTCP)
|
| 826 |
{
|
| 827 |
TCB_STUB *ps;
|
| 828 |
|
| 829 |
if(TCPIsGetReady(hTCP))
|
| 830 |
{
|
| 831 |
ps = &TCBStubs[hTCP];
|
| 832 |
LoadTCB(hTCP);
|
| 833 |
|
| 834 |
// Delete all data in the RX buffer
|
| 835 |
ps->rxTail = ps->rxHead;
|
| 836 |
|
| 837 |
// Send a Window update message to the remote node
|
| 838 |
SendTCP(hTCP, ACK);
|
| 839 |
|
| 840 |
SaveTCB(hTCP);
|
| 841 |
}
|
| 842 |
}
|
| 843 |
|
| 844 |
|
| 845 |
/*********************************************************************
|
| 846 |
* Function: WORD TCPIsGetReady(TCP_SOCKET hTCP)
|
| 847 |
*
|
| 848 |
* PreCondition: TCPInit() is already called.
|
| 849 |
*
|
| 850 |
* Input: hTCP - socket to test
|
| 851 |
*
|
| 852 |
* Output: Number of bytes that are available in socket 'hTCP'
|
| 853 |
* for immediate retrieval
|
| 854 |
*
|
| 855 |
* Side Effects: None
|
| 856 |
*
|
| 857 |
* Overview: None
|
| 858 |
*
|
| 859 |
* Note: None
|
| 860 |
********************************************************************/
|
| 861 |
WORD TCPIsGetReady(TCP_SOCKET hTCP)
|
| 862 |
{
|
| 863 |
TCB_STUB *ps;
|
| 864 |
|
| 865 |
ps = &TCBStubs[hTCP];
|
| 866 |
|
| 867 |
if(ps->rxHead >= ps->rxTail)
|
| 868 |
return ps->rxHead - ps->rxTail;
|
| 869 |
else
|
| 870 |
return (ps->bufferEnd - ps->rxTail + 1) + (ps->rxHead - ps->bufferRxStart);
|
| 871 |
}
|
| 872 |
|
| 873 |
|
| 874 |
/*********************************************************************
|
| 875 |
* Function: BOOL TCPGet(TCP_SOCKET hTCP, BYTE *byte)
|
| 876 |
*
|
| 877 |
* PreCondition: TCPInit() is already called
|
| 878 |
*
|
| 879 |
* Input: hTCP - socket
|
| 880 |
* byte - Pointer to a byte.
|
| 881 |
*
|
| 882 |
* Output: TRUE if a byte was read.
|
| 883 |
* FALSE if byte was not read.
|
| 884 |
*
|
| 885 |
* Side Effects: None
|
| 886 |
*
|
| 887 |
* Overview: None
|
| 888 |
*
|
| 889 |
* Note: None
|
| 890 |
********************************************************************/
|
| 891 |
BOOL TCPGet(TCP_SOCKET hTCP, BYTE *byte)
|
| 892 |
{
|
| 893 |
TCB_STUB *ps;
|
| 894 |
WORD GetReadyCount;
|
| 895 |
|
| 896 |
GetReadyCount = TCPIsGetReady(hTCP);
|
| 897 |
if(GetReadyCount == 0u)
|
| 898 |
return FALSE;
|
| 899 |
|
| 900 |
ps = &TCBStubs[hTCP];
|
| 901 |
MACSetReadPtr(ps->rxTail);
|
| 902 |
*byte = MACGet();
|
| 903 |
if(++ps->rxTail > ps->bufferEnd)
|
| 904 |
ps->rxTail = ps->bufferRxStart;
|
| 905 |
|
| 906 |
// Send a window update if we've run out of data
|
| 907 |
if(GetReadyCount == 1u)
|
| 908 |
{
|
| 909 |
LoadTCB(hTCP);
|
| 910 |
SendTCP(hTCP, ACK);
|
| 911 |
SaveTCB(hTCP);
|
| 912 |
}
|
| 913 |
// If not already enabled, start a timer so a window
|
| 914 |
// update will get sent to the remote node at some point
|
| 915 |
else if(!ps->Flags.bTimer2Enabled)
|
| 916 |
{
|
| 917 |
ps->Flags.bTimer2Enabled = TRUE;
|
| 918 |
ps->eventTime2 = (WORD)TickGet() + TCP_AUTO_TRANSMIT_TIMEOUT_VAL;
|
| 919 |
}
|
| 920 |
|
| 921 |
|
| 922 |
return TRUE;
|
| 923 |
}
|
| 924 |
|
| 925 |
|
| 926 |
/*********************************************************************
|
| 927 |
* Function: WORD TCPGetArray(TCP_SOCKET hTCP, BYTE *buffer,
|
| 928 |
* WORD len)
|
| 929 |
*
|
| 930 |
* PreCondition: TCPInit() is already called
|
| 931 |
*
|
| 932 |
* Input: hTCP - socket handle
|
| 933 |
* buffer - Buffer to hold received data.
|
| 934 |
* len - Buffer length
|
| 935 |
*
|
| 936 |
* Output: Number of bytes loaded into buffer.
|
| 937 |
*
|
| 938 |
* Side Effects: None
|
| 939 |
*
|
| 940 |
* Overview: None
|
| 941 |
*
|
| 942 |
* Note: None
|
| 943 |
********************************************************************/
|
| 944 |
WORD TCPGetArray(TCP_SOCKET hTCP, BYTE *buffer, WORD len)
|
| 945 |
{
|
| 946 |
WORD ActualLen;
|
| 947 |
WORD RightLen = 0;
|
| 948 |
TCB_STUB *ps;
|
| 949 |
|
| 950 |
ps = &TCBStubs[hTCP];
|
| 951 |
|
| 952 |
ActualLen = TCPIsGetReady(hTCP);
|
| 953 |
if(len > ActualLen)
|
| 954 |
len = ActualLen;
|
| 955 |
|
| 956 |
// See if we need a two part get
|
| 957 |
if(ps->rxTail + len > ps->bufferEnd)
|
| 958 |
{
|
| 959 |
RightLen = ps->bufferEnd - ps->rxTail + 1;
|
| 960 |
MACSetReadPtr(ps->rxTail);
|
| 961 |
MACGetArray(buffer, RightLen);
|
| 962 |
if(buffer)
|
| 963 |
buffer += RightLen;
|
| 964 |
len -= RightLen;
|
| 965 |
ps->rxTail = ps->bufferRxStart;
|
| 966 |
}
|
| 967 |
|
| 968 |
MACSetReadPtr(ps->rxTail);
|
| 969 |
MACGetArray(buffer, len);
|
| 970 |
ps->rxTail += len;
|
| 971 |
|
| 972 |
// Send a window update if we've run low on data
|
| 973 |
if(ActualLen - len <= len)
|
| 974 |
{
|
| 975 |
LoadTCB(hTCP);
|
| 976 |
SendTCP(hTCP, ACK);
|
| 977 |
SaveTCB(hTCP);
|
| 978 |
}
|
| 979 |
else if(!ps->Flags.bTimer2Enabled)
|
| 980 |
// If not already enabled, start a timer so a window
|
| 981 |
// update will get sent to the remote node at some point
|
| 982 |
{
|
| 983 |
ps->Flags.bTimer2Enabled = TRUE;
|
| 984 |
ps->eventTime2 = (WORD)TickGet() + TCP_AUTO_TRANSMIT_TIMEOUT_VAL;
|
| 985 |
}
|
| 986 |
|
| 987 |
return len + RightLen;
|
| 988 |
}
|
| 989 |
|
| 990 |
|
| 991 |
/*********************************************************************
|
| 992 |
* Function: WORD TCPGetRxFIFOFree(TCP_SOCKET hTCP)
|
| 993 |
*
|
| 994 |
* PreCondition: TCPInit() is already called
|
| 995 |
*
|
| 996 |
* Input: hTCP - TCP socket handle
|
| 997 |
*
|
| 998 |
* Output: Number of bytes that can still fit in the RX FIFO.
|
| 999 |
* 0 is returned if the FIFO is completely full.
|
| 1000 |
*
|
| 1001 |
* Side Effects: None
|
| 1002 |
*
|
| 1003 |
* Overview: None
|
| 1004 |
*
|
| 1005 |
* Note: None
|
| 1006 |
********************************************************************/
|
| 1007 |
WORD TCPGetRxFIFOFree(TCP_SOCKET hTCP)
|
| 1008 |
{
|
| 1009 |
WORD wDataLen;
|
| 1010 |
WORD wFIFOSize;
|
| 1011 |
|
| 1012 |
// Calculate total usable FIFO size
|
| 1013 |
wFIFOSize = TCBStubs[hTCP].bufferEnd - TCBStubs[hTCP].bufferRxStart;
|
| 1014 |
|
| 1015 |
// Find out how many data bytes are actually in the RX FIFO
|
| 1016 |
wDataLen = TCPIsGetReady(hTCP);
|
| 1017 |
|
| 1018 |
return wFIFOSize - wDataLen;
|
| 1019 |
}
|
| 1020 |
|
| 1021 |
/*********************************************************************
|
| 1022 |
* Function: WORD TCPFindArray(TCP_SOCKET hTCP, BYTE *cFindArray, WORD wLen, WORD wStart, BOOL bTextCompare)
|
| 1023 |
*
|
| 1024 |
* PreCondition: TCPInit() is already called
|
| 1025 |
*
|
| 1026 |
* Input: hTCP - TCP socket handle
|
| 1027 |
* cFindArray - Pointer to an array of bytes to look for
|
| 1028 |
* wLen - Length of cFindArray
|
| 1029 |
* wStart - Position within the RX FIFO to begin searching. 0 is the beginning of the FIFO.
|
| 1030 |
* bTextCompare- Search using a case-insensitive algorithm if TRUE, otherwise, do a binary 1 to 1 search
|
| 1031 |
*
|
| 1032 |
* Output: 0xFFFF: Array not found
|
| 1033 |
* 0 to 65534: Location the array was found
|
| 1034 |
*
|
| 1035 |
* Side Effects: None
|
| 1036 |
*
|
| 1037 |
* Overview: None
|
| 1038 |
*
|
| 1039 |
* Note: As an example, if the RX FIFO contains:
|
| 1040 |
* "PIC MCUs are good."
|
| 1041 |
* and cFindArray -> "MCU"
|
| 1042 |
* and wLen -> 3
|
| 1043 |
* the value returned by the search function would be 4
|
| 1044 |
********************************************************************/
|
| 1045 |
WORD TCPFindArray(TCP_SOCKET hTCP, BYTE *cFindArray, WORD wLen, WORD wStart, BOOL bTextCompare)
|
| 1046 |
{
|
| 1047 |
WORD wDataLen;
|
| 1048 |
WORD wBytesUntilWrap;
|
| 1049 |
WORD wLocation;
|
| 1050 |
WORD wLenStart;
|
| 1051 |
BYTE *cFindArrayStart;
|
| 1052 |
BYTE i, j, k;
|
| 1053 |
BYTE buffer[8];
|
| 1054 |
TCB_STUB *ps;
|
| 1055 |
|
| 1056 |
if(wLen == 0u)
|
| 1057 |
return 0u;
|
| 1058 |
|
| 1059 |
ps = &TCBStubs[hTCP];
|
| 1060 |
|
| 1061 |
// Find out how many bytes are in the RX FIFO and return
|
| 1062 |
// immediately if we won't possibly find a match
|
| 1063 |
wDataLen = TCPIsGetReady(hTCP);
|
| 1064 |
if(wDataLen < wLen + wStart)
|
| 1065 |
return 0xFFFFu;
|
| 1066 |
|
| 1067 |
wLocation = ps->rxTail + wStart;
|
| 1068 |
if(wLocation > ps->bufferEnd)
|
| 1069 |
wLocation -= ps->bufferEnd - ps->bufferRxStart + 1;
|
| 1070 |
MACSetReadPtr(wLocation);
|
| 1071 |
wBytesUntilWrap = ps->bufferEnd - wLocation + 1;
|
| 1072 |
wLocation = wStart;
|
| 1073 |
wLenStart = wLen;
|
| 1074 |
cFindArrayStart = cFindArray;
|
| 1075 |
j = *cFindArray++;
|
| 1076 |
if(bTextCompare)
|
| 1077 |
{
|
| 1078 |
if(j >= 'a' && j <= 'z')
|
| 1079 |
j += 'A'-'a';
|
| 1080 |
}
|
| 1081 |
|
| 1082 |
// Search for the array
|
| 1083 |
while(1)
|
| 1084 |
{
|
| 1085 |
// Figure out how big of a chunk to read
|
| 1086 |
k = sizeof(buffer);
|
| 1087 |
if(k > wBytesUntilWrap)
|
| 1088 |
k = wBytesUntilWrap;
|
| 1089 |
if((WORD)k > wLen)
|
| 1090 |
k = wLen;
|
| 1091 |
|
| 1092 |
// Read a chunk of data into the buffer
|
| 1093 |
MACGetArray(buffer, (WORD)k);
|
| 1094 |
wBytesUntilWrap -= k;
|
| 1095 |
|
| 1096 |
if(wBytesUntilWrap == 0)
|
| 1097 |
{
|
| 1098 |
MACSetReadPtr(ps->bufferRxStart);
|
| 1099 |
wBytesUntilWrap = 0xFFFFu;
|
| 1100 |
}
|
| 1101 |
|
| 1102 |
// Convert everything to uppercase
|
| 1103 |
if(bTextCompare)
|
| 1104 |
{
|
| 1105 |
for(i = 0; i < k; i++)
|
| 1106 |
{
|
| 1107 |
if(buffer[i] >= 'a' && buffer[i] <= 'z')
|
| 1108 |
buffer[i] += 'A'-'a';
|
| 1109 |
|
| 1110 |
if(j == buffer[i])
|
| 1111 |
{
|
| 1112 |
if(--wLen == 0)
|
| 1113 |
return wLocation-wLenStart + i + 1;
|
| 1114 |
j = *cFindArray++;
|
| 1115 |
if(j >= 'a' && j <= 'z')
|
| 1116 |
j += 'A'-'a';
|
| 1117 |
}
|
| 1118 |
else
|
| 1119 |
{
|
| 1120 |
wLen = wLenStart;
|
| 1121 |
cFindArray = cFindArrayStart;
|
| 1122 |
j = *cFindArray++;
|
| 1123 |
if(j >= 'a' && j <= 'z')
|
| 1124 |
j += 'A'-'a';
|
| 1125 |
}
|
| 1126 |
}
|
| 1127 |
}
|
| 1128 |
else // Compare as is
|
| 1129 |
{
|
| 1130 |
for(i = 0; i < k; i++)
|
| 1131 |
{
|
| 1132 |
if(j == buffer[i])
|
| 1133 |
{
|
| 1134 |
if(--wLen == 0)
|
| 1135 |
return wLocation-wLenStart + i + 1;
|
| 1136 |
j = *cFindArray++;
|
| 1137 |
}
|
| 1138 |
else
|
| 1139 |
{
|
| 1140 |
wLen = wLenStart;
|
| 1141 |
cFindArray = cFindArrayStart;
|
| 1142 |
j = *cFindArray++;
|
| 1143 |
}
|
| 1144 |
}
|
| 1145 |
}
|
| 1146 |
|
| 1147 |
// Check to see if it is impossible to find a match
|
| 1148 |
wDataLen -= k;
|
| 1149 |
if(wDataLen < wLen)
|
| 1150 |
return 0xFFFFu;
|
| 1151 |
|
| 1152 |
wLocation += k;
|
| 1153 |
}
|
| 1154 |
}
|
| 1155 |
|
| 1156 |
WORD TCPFindROMArray(TCP_SOCKET hTCP, ROM BYTE *cFindArray, WORD wLen, WORD wStart, BOOL bTextCompare)
|
| 1157 |
{
|
| 1158 |
WORD wDataLen;
|
| 1159 |
WORD wBytesUntilWrap;
|
| 1160 |
WORD wLocation;
|
| 1161 |
WORD wLenStart;
|
| 1162 |
ROM BYTE *cFindArrayStart;
|
| 1163 |
BYTE i, j, k;
|
| 1164 |
BYTE buffer[8];
|
| 1165 |
TCB_STUB *ps;
|
| 1166 |
|
| 1167 |
if(wLen == 0u)
|
| 1168 |
return 0u;
|
| 1169 |
|
| 1170 |
ps = &TCBStubs[hTCP];
|
| 1171 |
|
| 1172 |
// Find out how many bytes are in the RX FIFO and return
|
| 1173 |
// immediately if we won't possibly find a match
|
| 1174 |
wDataLen = TCPIsGetReady(hTCP);
|
| 1175 |
if(wDataLen < wLen + wStart)
|
| 1176 |
return 0xFFFFu;
|
| 1177 |
|
| 1178 |
wLocation = ps->rxTail + wStart;
|
| 1179 |
if(wLocation > ps->bufferEnd)
|
| 1180 |
wLocation -= ps->bufferEnd - ps->bufferRxStart + 1;
|
| 1181 |
MACSetReadPtr(wLocation);
|
| 1182 |
wBytesUntilWrap = ps->bufferEnd - wLocation + 1;
|
| 1183 |
wLocation = wStart;
|
| 1184 |
wLenStart = wLen;
|
| 1185 |
cFindArrayStart = cFindArray;
|
| 1186 |
j = *cFindArray++;
|
| 1187 |
if(bTextCompare)
|
| 1188 |
{
|
| 1189 |
if(j >= 'a' && j <= 'z')
|
| 1190 |
j += 'A'-'a';
|
| 1191 |
}
|
| 1192 |
|
| 1193 |
// Search for the array
|
| 1194 |
while(1)
|
| 1195 |
{
|
| 1196 |
// Figure out how big of a chunk to read
|
| 1197 |
k = sizeof(buffer);
|
| 1198 |
if(k > wBytesUntilWrap)
|
| 1199 |
k = wBytesUntilWrap;
|
| 1200 |
if((WORD)k > wLen)
|
| 1201 |
k = wLen;
|
| 1202 |
|
| 1203 |
// Read a chunk of data into the buffer
|
| 1204 |
MACGetArray(buffer, (WORD)k);
|
| 1205 |
wBytesUntilWrap -= k;
|
| 1206 |
|
| 1207 |
if(wBytesUntilWrap == 0)
|
| 1208 |
{
|
| 1209 |
MACSetReadPtr(ps->bufferRxStart);
|
| 1210 |
wBytesUntilWrap = 0xFFFFu;
|
| 1211 |
}
|
| 1212 |
|
| 1213 |
// Convert everything to uppercase
|
| 1214 |
if(bTextCompare)
|
| 1215 |
{
|
| 1216 |
for(i = 0; i < k; i++)
|
| 1217 |
{
|
| 1218 |
if(buffer[i] >= 'a' && buffer[i] <= 'z')
|
| 1219 |
buffer[i] += 'A'-'a';
|
| 1220 |
|
| 1221 |
if(j == buffer[i])
|
| 1222 |
{
|
| 1223 |
if(--wLen == 0)
|
| 1224 |
return wLocation-wLenStart + i + 1;
|
| 1225 |
j = *cFindArray++;
|
| 1226 |
if(j >= 'a' && j <= 'z')
|
| 1227 |
j += 'A'-'a';
|
| 1228 |
}
|
| 1229 |
else
|
| 1230 |
{
|
| 1231 |
wLen = wLenStart;
|
| 1232 |
cFindArray = cFindArrayStart;
|
| 1233 |
j = *cFindArray++;
|
| 1234 |
if(j >= 'a' && j <= 'z')
|
| 1235 |
j += 'A'-'a';
|
| 1236 |
}
|
| 1237 |
}
|
| 1238 |
}
|
| 1239 |
else // Compare as is
|
| 1240 |
{
|
| 1241 |
for(i = 0; i < k; i++)
|
| 1242 |
{
|
| 1243 |
if(j == buffer[i])
|
| 1244 |
{
|
| 1245 |
if(--wLen == 0)
|
| 1246 |
return wLocation-wLenStart + i + 1;
|
| 1247 |
j = *cFindArray++;
|
| 1248 |
}
|
| 1249 |
else
|
| 1250 |
{
|
| 1251 |
wLen = wLenStart;
|
| 1252 |
cFindArray = cFindArrayStart;
|
| 1253 |
j = *cFindArray++;
|
| 1254 |
}
|
| 1255 |
}
|
| 1256 |
}
|
| 1257 |
|
| 1258 |
// Check to see if it is impossible to find a match
|
| 1259 |
wDataLen -= k;
|
| 1260 |
if(wDataLen < wLen)
|
| 1261 |
return 0xFFFFu;
|
| 1262 |
|
| 1263 |
wLocation += k;
|
| 1264 |
}
|
| 1265 |
}
|
| 1266 |
|
| 1267 |
WORD TCPFind(TCP_SOCKET hTCP, BYTE cFind, WORD wStart, BOOL bTextCompare)
|
| 1268 |
{
|
| 1269 |
return TCPFindArray(hTCP, &cFind, sizeof(cFind), wStart, bTextCompare);
|
| 1270 |
}
|
| 1271 |
|
| 1272 |
|
| 1273 |
/*********************************************************************
|
| 1274 |
* Function: void TCPTick(void)
|
| 1275 |
*
|
| 1276 |
* PreCondition: TCPInit() is already called.
|
| 1277 |
*
|
| 1278 |
* Input: None
|
| 1279 |
*
|
| 1280 |
* Output: Each socket FSM is executed for any timeout
|
| 1281 |
* situation.
|
| 1282 |
*
|
| 1283 |
* Side Effects: None
|
| 1284 |
*
|
| 1285 |
* Overview: None
|
| 1286 |
*
|
| 1287 |
* Note: None
|
| 1288 |
********************************************************************/
|
| 1289 |
void TCPTick(void)
|
| 1290 |
{
|
| 1291 |
TCP_SOCKET hTCP;
|
| 1292 |
TCB_STUB *ps;
|
| 1293 |
BOOL bACKSent;
|
| 1294 |
|
| 1295 |
// Periodically all "not closed" sockets must perform timed operations
|
| 1296 |
for(hTCP = 0; hTCP < MAX_TCP_SOCKETS; hTCP++)
|
| 1297 |
{
|
| 1298 |
ps = &TCBStubs[hTCP];
|
| 1299 |
|
| 1300 |
bACKSent = FALSE;
|
| 1301 |
|
| 1302 |
// Transmit ASAP data if the medium is available
|
| 1303 |
if(ps->Flags.bTXASAP)
|
| 1304 |
{
|
| 1305 |
if(MACIsTxReady())
|
| 1306 |
{
|
| 1307 |
LoadTCB(hTCP);
|
| 1308 |
SendTCP(hTCP, ACK);
|
| 1309 |
SaveTCB(hTCP);
|
| 1310 |
bACKSent = TRUE;
|
| 1311 |
}
|
| 1312 |
}
|
| 1313 |
|
| 1314 |
// Perform any needed window updates and data transmissions
|
| 1315 |
if(ps->Flags.bTimer2Enabled)
|
| 1316 |
{
|
| 1317 |
// See if the timeout has occured
|
| 1318 |
if((SHORT)(ps->eventTime2 - (WORD)TickGet()) <= (SHORT)0)
|
| 1319 |
{
|
| 1320 |
// Send out a window update and any bytes waiting in the TX FIFO
|
| 1321 |
if(!bACKSent)
|
| 1322 |
{
|
| 1323 |
LoadTCB(hTCP);
|
| 1324 |
SendTCP(hTCP, ACK);
|
| 1325 |
SaveTCB(hTCP);
|
| 1326 |
bACKSent = TRUE;
|
| 1327 |
}
|
| 1328 |
}
|
| 1329 |
}
|
| 1330 |
|
| 1331 |
// Process Delayed ACKnowledgement timer
|
| 1332 |
if(ps->Flags.bDelayedACKTimerEnabled)
|
| 1333 |
{
|
| 1334 |
// See if the timeout has occured
|
| 1335 |
if((SHORT)(ps->delayedACKTime - (WORD)TickGet()) <= (SHORT)0)
|
| 1336 |
{
|
| 1337 |
if(!bACKSent)
|
| 1338 |
{
|
| 1339 |
// Send out our delayed ACK
|
| 1340 |
LoadTCB(hTCP);
|
| 1341 |
SendTCP(hTCP, ACK);
|
| 1342 |
SaveTCB(hTCP);
|
| 1343 |
bACKSent = TRUE;
|
| 1344 |
}
|
| 1345 |
}
|
| 1346 |
}
|
| 1347 |
|
| 1348 |
// The TCP_CLOSED, TCP_LISTEN, and sometimes the TCP_ESTABLISHED
|
| 1349 |
// state don't need any timeout events
|
| 1350 |
if(!ps->Flags.bTimerEnabled)
|
| 1351 |
continue;
|
| 1352 |
|
| 1353 |
// If timeout has not occured, do not do anything.
|
| 1354 |
if((LONG)(TickGet() - ps->eventTime) < (LONG)0)
|
| 1355 |
continue;
|
| 1356 |
|
| 1357 |
// Load up extended MyTCB information
|
| 1358 |
// If bACKSent, then the TCB has already been loaded. No need to do it again.
|
| 1359 |
if(!bACKSent)
|
| 1360 |
LoadTCB(hTCP);
|
| 1361 |
|
| 1362 |
// This will be one more attempt.
|
| 1363 |
MyTCB.retryCount++;
|
| 1364 |
|
| 1365 |
// Update timeout value if there is need to wait longer.
|
| 1366 |
MyTCB.retryInterval <<= 1;
|
| 1367 |
|
| 1368 |
// Restart timeout reference.
|
| 1369 |
ps->eventTime = TickGet() + MyTCB.retryInterval;
|
| 1370 |
|
| 1371 |
// A timeout has occured. Respond to this timeout condition
|
| 1372 |
// depending on what state this socket is in.
|
| 1373 |
switch(ps->smState)
|
| 1374 |
{
|
| 1375 |
case TCP_SYN_SENT:
|
| 1376 |
// Keep sending SYN until we hear from remote node.
|
| 1377 |
// This may be for infinite time, in that case
|
| 1378 |
// caller must detect it and do something.
|
| 1379 |
MyTCB.retryInterval = TCP_START_TIMEOUT_VAL;
|
| 1380 |
MyTCB.retryCount = 0;
|
| 1381 |
SendTCP(hTCP, SYN);
|
| 1382 |
break;
|
| 1383 |
|
| 1384 |
case TCP_SYN_RECEIVED:
|
| 1385 |
// We must receive ACK before timeout expires.
|
| 1386 |
// If not, resend SYN+ACK.
|
| 1387 |
// Abort, if maximum attempts counts are reached.
|
| 1388 |
if(MyTCB.retryCount <= MAX_RETRY_COUNTS)
|
| 1389 |
{
|
| 1390 |
SendTCP(hTCP, SYN | ACK);
|
| 1391 |
}
|
| 1392 |
else
|
| 1393 |
{
|
| 1394 |
if(ps->Flags.bServer)
|
| 1395 |
{
|
| 1396 |
SendTCP(hTCP, RST);
|
| 1397 |
CloseSocket(hTCP);
|
| 1398 |
}
|
| 1399 |
else
|
| 1400 |
{
|
| 1401 |
ps->smState = TCP_SYN_SENT;
|
| 1402 |
MyTCB.retryInterval = TCP_START_TIMEOUT_VAL;
|
| 1403 |
MyTCB.retryCount = 0;
|
| 1404 |
SendTCP(hTCP, SYN);
|
| 1405 |
}
|
| 1406 |
}
|
| 1407 |
break;
|
| 1408 |
|
| 1409 |
case TCP_ESTABLISHED:
|
| 1410 |
if(MyTCB.txUnackedTail != ps->txTail)
|
| 1411 |
{
|
| 1412 |
// Retransmit any unacknowledged data
|
| 1413 |
if(MyTCB.retryCount <= MAX_RETRY_COUNTS)
|
| 1414 |
{
|
| 1415 |
// Roll back unacknowledged TX tail pointer
|
| 1416 |
MyTCB.MySEQ -= (LONG)(SHORT)(MyTCB.txUnackedTail - ps->txTail);
|
| 1417 |
if(MyTCB.txUnackedTail < ps->txTail)
|
| 1418 |
MyTCB.MySEQ -= (LONG)(SHORT)(ps->bufferRxStart - ps->bufferTxStart);
|
| 1419 |
MyTCB.txUnackedTail = ps->txTail;
|
| 1420 |
|
| 1421 |
SendTCP(hTCP, PSH | ACK);
|
| 1422 |
}
|
| 1423 |
else
|
| 1424 |
{
|
| 1425 |
// No response back for too long, close connection
|
| 1426 |
// This could happen, for instance, if the communication
|
| 1427 |
// medium was lost
|
| 1428 |
MyTCB.MySEQ++;
|
| 1429 |
ps->smState = TCP_FIN_WAIT_1;
|
| 1430 |
MyTCB.retryInterval = TCP_START_TIMEOUT_VAL;
|
| 1431 |
MyTCB.retryCount = 0;
|
| 1432 |
|
| 1433 |
SendTCP(hTCP, FIN | ACK);
|
| 1434 |
}
|
| 1435 |
}
|
| 1436 |
break;
|
| 1437 |
|
| 1438 |
case TCP_FIN_WAIT_1:
|
| 1439 |
if(MyTCB.retryCount <= MAX_RETRY_COUNTS)
|
| 1440 |
{
|
| 1441 |
// Roll back unacknowledged TX tail pointer
|
| 1442 |
MyTCB.MySEQ -= (LONG)(SHORT)(MyTCB.txUnackedTail - ps->txTail);
|
| 1443 |
if(MyTCB.txUnackedTail < ps->txTail)
|
| 1444 |
MyTCB.MySEQ -= (LONG)(SHORT)(ps->bufferRxStart - ps->bufferTxStart);
|
| 1445 |
MyTCB.txUnackedTail = ps->txTail;
|
| 1446 |
|
| 1447 |
// Send another FIN
|
| 1448 |
SendTCP(hTCP, FIN | ACK);
|
| 1449 |
}
|
| 1450 |
else
|
| 1451 |
{
|
| 1452 |
// Close on our own, we can't seem to communicate
|
| 1453 |
// with the remote node anymore
|
| 1454 |
SendTCP(hTCP, RST | ACK);
|
| 1455 |
CloseSocket(hTCP);
|
| 1456 |
}
|
| 1457 |
break;
|
| 1458 |
|
| 1459 |
case TCP_FIN_WAIT_2:
|
| 1460 |
// Close on our own, we can't seem to communicate
|
| 1461 |
// with the remote node anymore
|
| 1462 |
SendTCP(hTCP, RST | ACK);
|
| 1463 |
CloseSocket(hTCP);
|
| 1464 |
break;
|
| 1465 |
|
| 1466 |
case TCP_CLOSING:
|
| 1467 |
if(MyTCB.retryCount <= MAX_RETRY_COUNTS)
|
| 1468 |
{
|
| 1469 |
// Roll back unacknowledged TX tail pointer
|
| 1470 |
MyTCB.MySEQ -= (LONG)(SHORT)(MyTCB.txUnackedTail - ps->txTail);
|
| 1471 |
if(MyTCB.txUnackedTail < ps->txTail)
|
| 1472 |
MyTCB.MySEQ -= (LONG)(SHORT)(ps->bufferRxStart - ps->bufferTxStart);
|
| 1473 |
MyTCB.txUnackedTail = ps->txTail;
|
| 1474 |
|
| 1475 |
// Send another ACK
|
| 1476 |
SendTCP(hTCP, ACK);
|
| 1477 |
}
|
| 1478 |
else
|
| 1479 |
{
|
| 1480 |
// Close on our own, we can't seem to communicate
|
| 1481 |
// with the remote node anymore
|
| 1482 |
SendTCP(hTCP, RST | ACK);
|
| 1483 |
CloseSocket(hTCP);
|
| 1484 |
}
|
| 1485 |
break;
|
| 1486 |
|
| 1487 |
case TCP_TIME_WAIT:
|
| 1488 |
// Wait around for a while (2MSL) and then goto closed state
|
| 1489 |
CloseSocket(hTCP);
|
| 1490 |
break;
|
| 1491 |
|
| 1492 |
case TCP_CLOSE_WAIT:
|
| 1493 |
if(MyTCB.retryCount <= MAX_RETRY_COUNTS)
|
| 1494 |
{
|
| 1495 |
// Roll back unacknowledged TX tail pointer
|
| 1496 |
MyTCB.MySEQ -= (LONG)(SHORT)(MyTCB.txUnackedTail - ps->txTail);
|
| 1497 |
if(MyTCB.txUnackedTail < ps->txTail)
|
| 1498 |
MyTCB.MySEQ -= (LONG)(SHORT)(ps->bufferRxStart - ps->bufferTxStart);
|
| 1499 |
MyTCB.txUnackedTail = ps->txTail;
|
| 1500 |
|
| 1501 |
// Send ACK
|
| 1502 |
SendTCP(hTCP, ACK);
|
| 1503 |
}
|
| 1504 |
else
|
| 1505 |
{
|
| 1506 |
// We shouldn't get down here if the application properly closes the connection.
|
| 1507 |
// However, if it doesn't, we still need to ensure socket reuse, so let's forcefully close the socket.
|
| 1508 |
SendTCP(hTCP, RST | ACK);
|
| 1509 |
CloseSocket(hTCP);
|
| 1510 |
}
|
| 1511 |
break;
|
| 1512 |
|
| 1513 |
case TCP_LAST_ACK:
|
| 1514 |
// Send some more FINs or close anyway
|
| 1515 |
if(MyTCB.retryCount <= MAX_RETRY_COUNTS)
|
| 1516 |
{
|
| 1517 |
SendTCP(hTCP, FIN | ACK);
|
| 1518 |
}
|
| 1519 |
else
|
| 1520 |
{
|
| 1521 |
SendTCP(hTCP, RST | ACK);
|
| 1522 |
CloseSocket(hTCP);
|
| 1523 |
}
|
| 1524 |
break;
|
| 1525 |
}
|
| 1526 |
|
| 1527 |
SaveTCB(hTCP);
|
| 1528 |
}
|
| 1529 |
}
|
| 1530 |
|
| 1531 |
|
| 1532 |
|
| 1533 |
/*********************************************************************
|
| 1534 |
* Function: BOOL TCPProcess(NODE_INFO* remote,
|
| 1535 |
* IP_ADDR *localIP,
|
| 1536 |
* WORD len)
|
| 1537 |
*
|
| 1538 |
* PreCondition: TCPInit() is already called AND
|
| 1539 |
* TCP segment is ready in MAC buffer
|
| 1540 |
*
|
| 1541 |
* Input: remote - Remote node info
|
| 1542 |
* len - Total length of TCP semgent.
|
| 1543 |
*
|
| 1544 |
* Output: TRUE if this function has completed its task
|
| 1545 |
* FALSE otherwise
|
| 1546 |
*
|
| 1547 |
* Side Effects: None
|
| 1548 |
*
|
| 1549 |
* Overview: None
|
| 1550 |
*
|
| 1551 |
* Note: None
|
| 1552 |
********************************************************************/
|
| 1553 |
BOOL TCPProcess(NODE_INFO *remote, IP_ADDR *localIP, WORD len)
|
| 1554 |
{
|
| 1555 |
TCP_HEADER TCPHeader;
|
| 1556 |
PSEUDO_HEADER pseudoHeader;
|
| 1557 |
TCP_SOCKET socket;
|
| 1558 |
WORD_VAL checksum1;
|
| 1559 |
WORD_VAL checksum2;
|
| 1560 |
BYTE optionsSize;
|
| 1561 |
|
| 1562 |
// Calculate IP pseudoheader checksum.
|
| 1563 |
pseudoHeader.SourceAddress = remote->IPAddr;
|
| 1564 |
pseudoHeader.DestAddress = *localIP;
|
| 1565 |
pseudoHeader.Zero = 0x0;
|
| 1566 |
pseudoHeader.Protocol = IP_PROT_TCP;
|
| 1567 |
pseudoHeader.TCPLength = len;
|
| 1568 |
|
| 1569 |
SwapPseudoTCPHeader(pseudoHeader);
|
| 1570 |
|
| 1571 |
checksum1.Val = ~CalcIPChecksum((BYTE*)&pseudoHeader,
|
| 1572 |
sizeof(pseudoHeader));
|
| 1573 |
|
| 1574 |
// Now calculate TCP packet checksum in NIC RAM - should match
|
| 1575 |
// pesudo header checksum
|
| 1576 |
checksum2.Val = CalcIPBufferChecksum(len);
|
| 1577 |
|
| 1578 |
// Compare checksums.
|
| 1579 |
if(checksum1.Val != checksum2.Val)
|
| 1580 |
{
|
| 1581 |
MACDiscardRx();
|
| 1582 |
return TRUE;
|
| 1583 |
}
|
| 1584 |
|
| 1585 |
// Retrieve TCP header.
|
| 1586 |
IPSetRxBuffer(0);
|
| 1587 |
MACGetArray((BYTE*)&TCPHeader, sizeof(TCPHeader));
|
| 1588 |
SwapTCPHeader(&TCPHeader);
|
| 1589 |
|
| 1590 |
|
| 1591 |
// Skip over options to retrieve data bytes
|
| 1592 |
optionsSize = (BYTE)((TCPHeader.DataOffset.Val << 2)-
|
| 1593 |
sizeof(TCPHeader));
|
| 1594 |
len = len - optionsSize - sizeof(TCPHeader);
|
| 1595 |
|
| 1596 |
// Find matching socket.
|
| 1597 |
socket = FindMatchingSocket(&TCPHeader, remote);
|
| 1598 |
if(socket != INVALID_SOCKET)
|
| 1599 |
{
|
| 1600 |
HandleTCPSeg(socket, &TCPHeader, len);
|
| 1601 |
SaveTCB(socket);
|
| 1602 |
}
|
| 1603 |
else
|
| 1604 |
{
|
| 1605 |
// If this is an unknown socket, or we don't have any
|
| 1606 |
// listening sockets available, discard it. We can't
|
| 1607 |
// process it right now.
|
| 1608 |
MACDiscardRx();
|
| 1609 |
}
|
| 1610 |
|
| 1611 |
return TRUE;
|
| 1612 |
}
|
| 1613 |
|
| 1614 |
|
| 1615 |
/*********************************************************************
|
| 1616 |
* Function: static void SendTCP(TCP_SOCKET hTCP, BYTE flags)
|
| 1617 |
*
|
| 1618 |
* PreCondition: TCPInit() is already called
|
| 1619 |
* LoadTCP() is called with the value of hTCP
|
| 1620 |
*
|
| 1621 |
* Input: hTCP: Handle of socket to send packet with
|
| 1622 |
* flags: Additional TCP flags to include
|
| 1623 |
*
|
| 1624 |
* Output: A TCP segment is assembled and transmitted
|
| 1625 |
*
|
| 1626 |
* Side Effects: None
|
| 1627 |
*
|
| 1628 |
* Overview: None
|
| 1629 |
*
|
| 1630 |
* Note: Function does not save the MyTCB data. It is
|
| 1631 |
* the caller's responsibility to save it.
|
| 1632 |
********************************************************************/
|
| 1633 |
static void SendTCP(TCP_SOCKET hTCP, BYTE flags)
|
| 1634 |
{
|
| 1635 |
TCB_STUB *ps;
|
| 1636 |
WORD_VAL wVal;
|
| 1637 |
TCP_HEADER header;
|
| 1638 |
TCP_OPTIONS options;
|
| 1639 |
PSEUDO_HEADER pseudoHeader;
|
| 1640 |
WORD len;
|
| 1641 |
WORD wEffectiveWindow;
|
| 1642 |
|
| 1643 |
ps = &TCBStubs[hTCP];
|
| 1644 |
|
| 1645 |
// Status will now be synched, disable automatic future
|
| 1646 |
// status transmissions
|
| 1647 |
ps->Flags.bTimer2Enabled = 0;
|
| 1648 |
ps->Flags.bTXASAP = 0;
|
| 1649 |
ps->Flags.bDelayedACKTimerEnabled = 0;
|
| 1650 |
ps->Flags.bOneSegmentReceived = 0;
|
| 1651 |
|
| 1652 |
// Make sure that we can write to the MAC transmit area
|
| 1653 |
while(!IPIsTxReady());
|
| 1654 |
|
| 1655 |
// Put all socket application data in the TX space
|
| 1656 |
if(flags & SYN)
|
| 1657 |
{
|
| 1658 |
// Don't put any data for SYN messages
|
| 1659 |
len = 0;
|
| 1660 |
}
|
| 1661 |
else
|
| 1662 |
{
|
| 1663 |
// Begin copying any application data over to the TX space
|
| 1664 |
if(ps->txHead == MyTCB.txUnackedTail)
|
| 1665 |
{
|
| 1666 |
len = 0;
|
| 1667 |
}
|
| 1668 |
else if(ps->txHead > MyTCB.txUnackedTail)
|
| 1669 |
{
|
| 1670 |
len = ps->txHead - MyTCB.txUnackedTail;
|
| 1671 |
wEffectiveWindow = MyTCB.remoteWindow;
|
| 1672 |
if(MyTCB.txUnackedTail >= ps->txTail)
|
| 1673 |
wEffectiveWindow -= MyTCB.txUnackedTail - ps->txTail;
|
| 1674 |
else
|
| 1675 |
wEffectiveWindow -= (ps->bufferRxStart - ps->bufferTxStart) - (ps->txTail - MyTCB.txUnackedTail);
|
| 1676 |
|
| 1677 |
if(len > wEffectiveWindow)
|
| 1678 |
len = wEffectiveWindow;
|
| 1679 |
|
| 1680 |
if(len > 576)
|
| 1681 |
{
|
| 1682 |
len = 576;
|
| 1683 |
ps->Flags.bTXASAP = 1;
|
| 1684 |
}
|
| 1685 |
|
| 1686 |
MACMemCopyAsync(BASE_TX_ADDR+sizeof(ETHER_HEADER)+sizeof(IP_HEADER)+sizeof(TCP_HEADER), MyTCB.txUnackedTail, len);
|
| 1687 |
MyTCB.txUnackedTail += len;
|
| 1688 |
}
|
| 1689 |
else
|
| 1690 |
{
|
| 1691 |
pseudoHeader.TCPLength = ps->bufferRxStart - MyTCB.txUnackedTail;
|
| 1692 |
len = pseudoHeader.TCPLength + ps->txHead - ps->bufferTxStart;
|
| 1693 |
|
| 1694 |
wEffectiveWindow = MyTCB.remoteWindow;
|
| 1695 |
if(MyTCB.txUnackedTail >= ps->txTail)
|
| 1696 |
wEffectiveWindow -= MyTCB.txUnackedTail - ps->txTail;
|
| 1697 |
else
|
| 1698 |
wEffectiveWindow -= (ps->bufferRxStart - ps->bufferTxStart) - (ps->txTail - MyTCB.txUnackedTail);
|
| 1699 |
|
| 1700 |
if(len > wEffectiveWindow)
|
| 1701 |
len = wEffectiveWindow;
|
| 1702 |
|
| 1703 |
if(len > 576)
|
| 1704 |
{
|
| 1705 |
len = 576;
|
| 1706 |
ps->Flags.bTXASAP = 1;
|
| 1707 |
}
|
| 1708 |
|
| 1709 |
if(pseudoHeader.TCPLength > wEffectiveWindow)
|
| 1710 |
pseudoHeader.TCPLength = wEffectiveWindow;
|
| 1711 |
|
| 1712 |
if(pseudoHeader.TCPLength > 576)
|
| 1713 |
pseudoHeader.TCPLength = 576;
|
| 1714 |
|
| 1715 |
MACMemCopyAsync(BASE_TX_ADDR+sizeof(ETHER_HEADER)+sizeof(IP_HEADER)+sizeof(TCP_HEADER), MyTCB.txUnackedTail, pseudoHeader.TCPLength);
|
| 1716 |
pseudoHeader.TCPLength = len - pseudoHeader.TCPLength;
|
| 1717 |
|
| 1718 |
// Copy any left over chunks of application data over
|
| 1719 |
if(pseudoHeader.TCPLength)
|
| 1720 |
{
|
| 1721 |
MACMemCopyAsync(BASE_TX_ADDR+sizeof(ETHER_HEADER)+sizeof(IP_HEADER)+sizeof(TCP_HEADER)+(ps->bufferRxStart-MyTCB.txUnackedTail), ps->bufferTxStart, pseudoHeader.TCPLength);
|
| 1722 |
}
|
| 1723 |
|
| 1724 |
MyTCB.txUnackedTail += len;
|
| 1725 |
if(MyTCB.txUnackedTail >= ps->bufferRxStart)
|
| 1726 |
MyTCB.txUnackedTail -= ps->bufferRxStart-ps->bufferTxStart;
|
| 1727 |
}
|
| 1728 |
}
|
| 1729 |
|
| 1730 |
header.SourcePort = MyTCB.localPort.Val;
|
| 1731 |
header.DestPort = MyTCB.remotePort.Val;
|
| 1732 |
if(flags & (SYN | FIN))
|
| 1733 |
header.SeqNumber = MyTCB.MySEQ-1;
|
| 1734 |
else
|
| 1735 |
header.SeqNumber = MyTCB.MySEQ;
|
| 1736 |
header.AckNumber = MyTCB.RemoteSEQ;
|
| 1737 |
header.Flags.bits.Reserved2 = 0;
|
| 1738 |
header.DataOffset.Reserved3 = 0;
|
| 1739 |
header.Flags.byte = flags;
|
| 1740 |
header.UrgentPointer = 0;
|
| 1741 |
|
| 1742 |
// For next time
|
| 1743 |
MyTCB.MySEQ += (DWORD)len;
|
| 1744 |
|
| 1745 |
// Calculate the amount of free space in the RX buffer area of this socket
|
| 1746 |
if(ps->rxHead >= ps->rxTail)
|
| 1747 |
header.Window = (ps->bufferEnd - ps->bufferRxStart) - (ps->rxHead - ps->rxTail);
|
| 1748 |
else
|
| 1749 |
header.Window = ps->rxTail - ps->rxHead - 1;
|
| 1750 |
|
| 1751 |
// Calculate the amount of free space in the MAC RX buffer area and adjust window if needed
|
| 1752 |
wVal.Val = MACGetFreeRxSize()-64;
|
| 1753 |
if((SHORT)wVal.Val < (SHORT)0)
|
| 1754 |
wVal.Val = 0;
|
| 1755 |
// Force the remote node to throttle back if we are running low on general RX buffer space
|
| 1756 |
// if(header.Window > wVal.Val)
|
| 1757 |
if((header.Window > wVal.Val) && (wVal.Val < 2000))
|
| 1758 |
header.Window = wVal.Val;
|
| 1759 |
|
| 1760 |
SwapTCPHeader(&header);
|
| 1761 |
|
| 1762 |
|
| 1763 |
len += sizeof(header);
|
| 1764 |
|
| 1765 |
header.DataOffset.Val = sizeof(header) >> 2;
|
| 1766 |
if(flags & SYN)
|
| 1767 |
{
|
| 1768 |
len += sizeof(options);
|
| 1769 |
options.Kind = TCP_OPTIONS_MAX_SEG_SIZE;
|
| 1770 |
options.Length = 0x04;
|
| 1771 |
|
| 1772 |
// Load MSS and swap to big endian
|
| 1773 |
options.MaxSegSize.Val = 0x4002; // 576
|
| 1774 |
|
| 1775 |
header.DataOffset.Val += sizeof(options) >> 2;
|
| 1776 |
}
|
| 1777 |
|
| 1778 |
// Calculate IP pseudoheader checksum.
|
| 1779 |
pseudoHeader.SourceAddress = AppConfig.MyIPAddr;
|
| 1780 |
pseudoHeader.DestAddress = MyTCB.remote.IPAddr;
|
| 1781 |
pseudoHeader.Zero = 0x0;
|
| 1782 |
pseudoHeader.Protocol = IP_PROT_TCP;
|
| 1783 |
pseudoHeader.TCPLength = len;
|
| 1784 |
|
| 1785 |
SwapPseudoTCPHeader(pseudoHeader);
|
| 1786 |
|
| 1787 |
header.Checksum = ~CalcIPChecksum((BYTE*)&pseudoHeader, sizeof(pseudoHeader));
|
| 1788 |
|
| 1789 |
MACSetWritePtr(BASE_TX_ADDR + sizeof(ETHER_HEADER));
|
| 1790 |
|
| 1791 |
// Write IP header.
|
| 1792 |
IPPutHeader(&MyTCB.remote, IP_PROT_TCP, len);
|
| 1793 |
MACPutArray((BYTE*)&header, sizeof(header));
|
| 1794 |
if(flags & SYN)
|
| 1795 |
MACPutArray((BYTE*)&options, sizeof(options));
|
| 1796 |
|
| 1797 |
MACSetReadPtr(BASE_TX_ADDR + sizeof(ETHER_HEADER) + sizeof(IP_HEADER));
|
| 1798 |
wVal.Val = CalcIPBufferChecksum(len);
|
| 1799 |
|
| 1800 |
// Update the TCP checksum and begin transmission of the packet
|
| 1801 |
MACSetWritePtr(BASE_TX_ADDR + sizeof(ETHER_HEADER) + sizeof(IP_HEADER) + 16);
|
| 1802 |
MACPutArray((BYTE*)&wVal, sizeof(WORD));
|
| 1803 |
|
| 1804 |
while(!MACIsMemCopyDone());
|
| 1805 |
MACFlush();
|
| 1806 |
}
|
| 1807 |
|
| 1808 |
|
| 1809 |
|
| 1810 |
/*********************************************************************
|
| 1811 |
* Function: static TCP_SOCKET FindMatchingSocket(TCP_HEADER *h,
|
| 1812 |
* NODE_INFO* remote)
|
| 1813 |
*
|
| 1814 |
* PreCondition: TCPInit() is already called
|
| 1815 |
*
|
| 1816 |
* Input: h - TCP Header to be matched against.
|
| 1817 |
* remote - Node who sent this header.
|
| 1818 |
*
|
| 1819 |
* Output: A socket that matches with given header and remote
|
| 1820 |
* node is searched.
|
| 1821 |
* If such socket is found, its index is returned
|
| 1822 |
* else INVALID_SOCKET is returned.
|
| 1823 |
*
|
| 1824 |
* Side Effects: None
|
| 1825 |
*
|
| 1826 |
* Overview: None
|
| 1827 |
*
|
| 1828 |
* Note: None
|
| 1829 |
********************************************************************/
|
| 1830 |
static TCP_SOCKET FindMatchingSocket(TCP_HEADER *h, NODE_INFO *remote)
|
| 1831 |
{
|
| 1832 |
TCB_STUB *ps;
|
| 1833 |
TCP_SOCKET hTCP;
|
| 1834 |
TCP_SOCKET partialMatch;
|
| 1835 |
WORD hash;
|
| 1836 |
|
| 1837 |
partialMatch = INVALID_SOCKET;
|
| 1838 |
hash = (remote->IPAddr.w[1]+remote->IPAddr.w[0] + h->SourcePort) ^ h->DestPort;
|
| 1839 |
|
| 1840 |
for(hTCP = 0; hTCP < MAX_TCP_SOCKETS; hTCP++ )
|
| 1841 |
{
|
| 1842 |
ps = &TCBStubs[hTCP];
|
| 1843 |
|
| 1844 |
if(ps->smState == TCP_CLOSED)
|
| 1845 |
{
|
| 1846 |
continue;
|
| 1847 |
}
|
| 1848 |
else if(ps->smState == TCP_LISTEN)
|
| 1849 |
{
|
| 1850 |
if(ps->remoteHash.Val == h->DestPort)
|
| 1851 |
partialMatch = hTCP;
|
| 1852 |
continue;
|
| 1853 |
}
|
| 1854 |
else if(ps->remoteHash.Val != hash)
|
| 1855 |
{
|
| 1856 |
continue;
|
| 1857 |
}
|
| 1858 |
|
| 1859 |
LoadTCB(hTCP);
|
| 1860 |
if( h->DestPort == MyTCB.localPort.Val &&
|
| 1861 |
h->SourcePort == MyTCB.remotePort.Val &&
|
| 1862 |
remote->IPAddr.Val == MyTCB.remote.IPAddr.Val)
|
| 1863 |
{
|
| 1864 |
return hTCP;
|
| 1865 |
}
|
| 1866 |
}
|
| 1867 |
|
| 1868 |
// We are not listening on this port, nor is a socket using it
|
| 1869 |
if(partialMatch == INVALID_SOCKET)
|
| 1870 |
return INVALID_SOCKET;
|
| 1871 |
|
| 1872 |
// Set up the extended TCB with the info needed to establish a
|
| 1873 |
// connection and return this socket to the caller
|
| 1874 |
ps = &TCBStubs[partialMatch];
|
| 1875 |
|
| 1876 |
ps->remoteHash.Val = hash;
|
| 1877 |
ps->txHead = ps->bufferTxStart;
|
| 1878 |
ps->txTail = ps->bufferTxStart;
|
| 1879 |
ps->rxHead = ps->bufferRxStart;
|
| 1880 |
ps->rxTail = ps->bufferRxStart;
|
| 1881 |
ps->Flags.bTimerEnabled = FALSE;
|
| 1882 |
|
| 1883 |
memcpy((void*)&MyTCB.remote, (void*)remote, sizeof(NODE_INFO));
|
| 1884 |
MyTCB.remotePort.Val = h->SourcePort;
|
| 1885 |
MyTCB.localPort.Val = h->DestPort;
|
| 1886 |
((DWORD_VAL*)(&MyTCB.MySEQ))->w[0] = rand();
|
| 1887 |
((DWORD_VAL*)(&MyTCB.MySEQ))->w[1] = rand();
|
| 1888 |
MyTCB.txUnackedTail = ps->bufferTxStart;
|
| 1889 |
|
| 1890 |
return partialMatch;
|
| 1891 |
}
|
| 1892 |
|
| 1893 |
|
| 1894 |
|
| 1895 |
/*********************************************************************
|
| 1896 |
* Function: static void SwapTCPHeader(TCP_HEADER* header)
|
| 1897 |
*
|
| 1898 |
* PreCondition: None
|
| 1899 |
*
|
| 1900 |
* Input: header - TCP Header to be swapped.
|
| 1901 |
*
|
| 1902 |
* Output: Given header is swapped.
|
| 1903 |
*
|
| 1904 |
* Side Effects: None
|
| 1905 |
*
|
| 1906 |
* Overview: None
|
| 1907 |
*
|
| 1908 |
* Note: None
|
| 1909 |
********************************************************************/
|
| 1910 |
static void SwapTCPHeader(TCP_HEADER* header)
|
| 1911 |
{
|
| 1912 |
header->SourcePort = swaps(header->SourcePort);
|
| 1913 |
header->DestPort = swaps(header->DestPort);
|
| 1914 |
header->SeqNumber = swapl(header->SeqNumber);
|
| 1915 |
header->AckNumber = swapl(header->AckNumber);
|
| 1916 |
header->Window = swaps(header->Window);
|
| 1917 |
header->Checksum = swaps(header->Checksum);
|
| 1918 |
header->UrgentPointer = swaps(header->UrgentPointer);
|
| 1919 |
}
|
| 1920 |
|
| 1921 |
|
| 1922 |
|
| 1923 |
/*********************************************************************
|
| 1924 |
* Function: static void CloseSocket(TCP_SOCKET hTCP)
|
| 1925 |
*
|
| 1926 |
* PreCondition: TCPInit() is already called
|
| 1927 |
* LoadTCB() must be called with the value of hTCP
|
| 1928 |
*
|
| 1929 |
* Input: hTCP - Handle of socket to close/reinitialize
|
| 1930 |
*
|
| 1931 |
* Output: Given socket information is reset and any
|
| 1932 |
* buffered bytes held by this socket are discarded.
|
| 1933 |
*
|
| 1934 |
* Side Effects: None
|
| 1935 |
*
|
| 1936 |
* Overview: None
|
| 1937 |
*
|
| 1938 |
* Note: Function does not save the MyTCB data. It is
|
| 1939 |
* the caller's responsibility to save it.
|
| 1940 |
********************************************************************/
|
| 1941 |
static void CloseSocket(TCP_SOCKET hTCP)
|
| 1942 |
{
|
| 1943 |
TCB_STUB *ps;
|
| 1944 |
|
| 1945 |
ps = &TCBStubs[hTCP];
|
| 1946 |
|
| 1947 |
ps->smState = ps->Flags.bServer ? TCP_LISTEN : TCP_CLOSED;
|
| 1948 |
ps->Flags.bTimerEnabled = FALSE;
|
| 1949 |
ps->Flags.bTimer2Enabled = FALSE;
|
| 1950 |
ps->Flags.bDelayedACKTimerEnabled = FALSE;
|
| 1951 |
ps->Flags.bOneSegmentReceived = FALSE;
|
| 1952 |
ps->Flags.bHalfFullFlush = FALSE;
|
| 1953 |
ps->Flags.bTXASAP = FALSE;
|
| 1954 |
ps->remoteHash.Val = MyTCB.localPort.Val;
|
| 1955 |
ps->txTail = ps->bufferTxStart;
|
| 1956 |
ps->txHead = ps->bufferTxStart;
|
| 1957 |
ps->rxTail = ps->bufferRxStart;
|
| 1958 |
ps->rxHead = ps->bufferRxStart;
|
| 1959 |
MyTCB.txUnackedTail = ps->bufferTxStart;
|
| 1960 |
((DWORD_VAL*)(&MyTCB.MySEQ))->w[0] = rand();
|
| 1961 |
((DWORD_VAL*)(&MyTCB.MySEQ))->w[1] = rand();
|
| 1962 |
}
|
| 1963 |
|
| 1964 |
|
| 1965 |
|
| 1966 |
/*********************************************************************
|
| 1967 |
* Function: static void HandleTCPSeg(TCP_SOCKET hTCP, TCP_HEADER *h, WORD len)
|
| 1968 |
*
|
| 1969 |
* PreCondition: TCPInit() is already called AND
|
| 1970 |
* TCPProcess() is the caller.
|
| 1971 |
*
|
| 1972 |
* Input: hTCP - Socket that owns this segment
|
| 1973 |
* h - TCP Header
|
| 1974 |
* len - Total buffer length.
|
| 1975 |
*
|
| 1976 |
* Output: TCP FSM is executed on given socket with
|
| 1977 |
* given TCP segment.
|
| 1978 |
*
|
| 1979 |
* Side Effects: None
|
| 1980 |
*
|
| 1981 |
* Overview: None
|
| 1982 |
*
|
| 1983 |
* Note: None
|
| 1984 |
********************************************************************/
|
| 1985 |
static void HandleTCPSeg(TCP_SOCKET hTCP, TCP_HEADER *h, WORD len)
|
| 1986 |
{
|
| 1987 |
DWORD dwTemp;
|
| 1988 |
WORD wTemp;
|
| 1989 |
LONG lMissingBytes;
|
| 1990 |
WORD wMissingBytes;
|
| 1991 |
WORD wFreeSpace;
|
| 1992 |
TCB_STUB *ps;
|
| 1993 |
BYTE flags;
|
| 1994 |
|
| 1995 |
ps = &TCBStubs[hTCP];
|
| 1996 |
flags = 0x00;
|
| 1997 |
|
| 1998 |
|
| 1999 |
// Reset FSM, if RST is received.
|
| 2000 |
if(h->Flags.bits.flagRST)
|
| 2001 |
{
|
| 2002 |
SendTCP(hTCP, RST);
|
| 2003 |
CloseSocket(hTCP);
|
| 2004 |
MACDiscardRx();
|
| 2005 |
return;
|
| 2006 |
}
|
| 2007 |
|
| 2008 |
// Update the local stored copy of the RemoteWindow
|
| 2009 |
// If previously we had a zero window, and now we don't
|
| 2010 |
// immediately send whatever was panding
|
| 2011 |
if((MyTCB.remoteWindow == 0u) && h->Window)
|
| 2012 |
ps->Flags.bTXASAP = 1;
|
| 2013 |
MyTCB.remoteWindow = h->Window;
|
| 2014 |
|
| 2015 |
|
| 2016 |
switch(ps->smState)
|
| 2017 |
{
|
| 2018 |
case TCP_LISTEN:
|
| 2019 |
if(!h->Flags.bits.flagSYN)
|
| 2020 |
{
|
| 2021 |
SendTCP(hTCP, RST);
|
| 2022 |
CloseSocket(hTCP);
|
| 2023 |
break;
|
| 2024 |
}
|
| 2025 |
|
| 2026 |
flags = SYN | ACK;
|
| 2027 |
ps->smState = TCP_SYN_RECEIVED;
|
| 2028 |
|
| 2029 |
// Clear timeout info
|
| 2030 |
MyTCB.retryCount = 0;
|
| 2031 |
MyTCB.retryInterval = TCP_START_TIMEOUT_VAL;
|
| 2032 |
ps->eventTime = TickGet() + TCP_START_TIMEOUT_VAL;
|
| 2033 |
ps->Flags.bTimerEnabled = TRUE;
|
| 2034 |
|
| 2035 |
// We now have a sequence number for the remote node
|
| 2036 |
MyTCB.RemoteSEQ = h->SeqNumber + 1;
|
| 2037 |
|
| 2038 |
break;
|
| 2039 |
|
| 2040 |
case TCP_SYN_SENT:
|
| 2041 |
if(!h->Flags.bits.flagSYN)
|
| 2042 |
break;
|
| 2043 |
|
| 2044 |
if(h->Flags.bits.flagACK)
|
| 2045 |
{
|
| 2046 |
// If SYN+ACK, we may need to go to TCP_ESTABLISHED state
|
| 2047 |
if(h->AckNumber == MyTCB.MySEQ)
|
| 2048 |
{
|
| 2049 |
flags = ACK;
|
| 2050 |
ps->smState = TCP_ESTABLISHED;
|
| 2051 |
ps->Flags.bTimerEnabled = FALSE;
|
| 2052 |
|
| 2053 |
// Check for application data and make it
|
| 2054 |
// available, if present
|
| 2055 |
flags |= ProcessRXBytes(ps, h, len);
|
| 2056 |
}
|
| 2057 |
else
|
| 2058 |
{
|
| 2059 |
// ACK number incorrect: ignore this packet
|
| 2060 |
flags = RST;
|
| 2061 |
break;
|
| 2062 |
}
|
| 2063 |
}
|
| 2064 |
else
|
| 2065 |
{
|
| 2066 |
// Got SYN without ACK, need to go to TCP_SYN_RECEIVED state
|
| 2067 |
flags = SYN | ACK;
|
| 2068 |
ps->smState = TCP_SYN_RECEIVED;
|
| 2069 |
|
| 2070 |
// Clear timeout info
|
| 2071 |
MyTCB.retryCount = 0;
|
| 2072 |
MyTCB.retryInterval = TCP_START_TIMEOUT_VAL;
|
| 2073 |
ps->eventTime = TickGet() + TCP_START_TIMEOUT_VAL;
|
| 2074 |
}
|
| 2075 |
|
| 2076 |
// We now have a sequence number for the remote node
|
| 2077 |
MyTCB.RemoteSEQ = h->SeqNumber + 1;
|
| 2078 |
|
| 2079 |
break;
|
| 2080 |
|
| 2081 |
case TCP_SYN_RECEIVED:
|
| 2082 |
if(h->Flags.bits.flagACK && (h->AckNumber == MyTCB.MySEQ))
|
| 2083 |
{
|
| 2084 |
ps->smState = TCP_ESTABLISHED;
|
| 2085 |
ps->Flags.bTimerEnabled = FALSE;
|
| 2086 |
|
| 2087 |
// Check for application data and make it
|
| 2088 |
// available, if present
|
| 2089 |
flags |= ProcessRXBytes(ps, h, len);
|
| 2090 |
}
|
| 2091 |
|
| 2092 |
break;
|
| 2093 |
|
| 2094 |
case TCP_ESTABLISHED:
|
| 2095 |
// Check for application data and make it
|
| 2096 |
// available, if present
|
| 2097 |
flags |= ProcessRXBytes(ps, h, len);
|
| 2098 |
|
| 2099 |
// Handle any requests to close the connection
|
| 2100 |
if(h->Flags.bits.flagFIN)
|
| 2101 |
{
|
| 2102 |
MyTCB.RemoteSEQ++;
|
| 2103 |
|
| 2104 |
if(len == 0u)
|
| 2105 |
{
|
| 2106 |
flags = FIN | ACK;
|
| 2107 |
MyTCB.MySEQ++;
|
| 2108 |
ps->smState = TCP_LAST_ACK;
|
| 2109 |
}
|
| 2110 |
else
|
| 2111 |
{
|
| 2112 |
// Don't send a FIN back immediately. The application
|
| 2113 |
// may want to send a little bit more data before closing
|
| 2114 |
// the socket.
|
| 2115 |
flags = ACK;
|
| 2116 |
ps->smState = TCP_CLOSE_WAIT;
|
| 2117 |
}
|
| 2118 |
|
| 2119 |
// Clear timeout info
|
| 2120 |
MyTCB.retryCount = 0;
|
| 2121 |
MyTCB.retryInterval = TCP_START_TIMEOUT_VAL;
|
| 2122 |
ps->eventTime = TickGet() + TCP_START_TIMEOUT_VAL;
|
| 2123 |
ps->Flags.bTimerEnabled = TRUE;
|
| 2124 |
}
|
| 2125 |
|
| 2126 |
break;
|
| 2127 |
|
| 2128 |
case TCP_FIN_WAIT_1:
|
| 2129 |
if(h->Flags.bits.flagFIN && h->Flags.bits.flagACK && (h->AckNumber == MyTCB.MySEQ))
|
| 2130 |
{
|
| 2131 |
MyTCB.RemoteSEQ++;
|
| 2132 |
flags = ACK;
|
| 2133 |
ps->smState = TCP_TIME_WAIT;
|
| 2134 |
ps->eventTime = TickGet() + TCP_TIME_WAIT_TIMEOUT_VAL;
|
| 2135 |
}
|
| 2136 |
else if(h->Flags.bits.flagACK && (h->AckNumber == MyTCB.MySEQ))
|
| 2137 |
{
|
| 2138 |
ps->smState = TCP_FIN_WAIT_2;
|
| 2139 |
}
|
| 2140 |
else if(h->Flags.bits.flagFIN)
|
| 2141 |
{
|
| 2142 |
MyTCB.RemoteSEQ++;
|
| 2143 |
flags = ACK;
|
| 2144 |
ps->smState = TCP_CLOSING;
|
| 2145 |
|
| 2146 |
// Clear timeout info
|
| 2147 |
MyTCB.retryCount = 0;
|
| 2148 |
MyTCB.retryInterval = TCP_START_TIMEOUT_VAL;
|
| 2149 |
ps->eventTime = TickGet() + TCP_START_TIMEOUT_VAL;
|
| 2150 |
}
|
| 2151 |
|
| 2152 |
// Check for application data and make it
|
| 2153 |
// available, if present
|
| 2154 |
flags |= ProcessRXBytes(ps, h, len);
|
| 2155 |
|
| 2156 |
break;
|
| 2157 |
|
| 2158 |
case TCP_FIN_WAIT_2:
|
| 2159 |
if(h->Flags.bits.flagFIN)
|
| 2160 |
{
|
| 2161 |
MyTCB.RemoteSEQ++;
|
| 2162 |
flags = ACK;
|
| 2163 |
ps->smState = TCP_TIME_WAIT;
|
| 2164 |
ps->eventTime = TickGet() + TCP_TIME_WAIT_TIMEOUT_VAL;
|
| 2165 |
}
|
| 2166 |
|
| 2167 |
// Check for application data and make it
|
| 2168 |
// available, if present
|
| 2169 |
flags |= ProcessRXBytes(ps, h, len);
|
| 2170 |
|
| 2171 |
break;
|
| 2172 |
|
| 2173 |
case TCP_CLOSING:
|
| 2174 |
if(h->Flags.bits.flagACK && (h->AckNumber == MyTCB.MySEQ))
|
| 2175 |
{
|
| 2176 |
ps->smState = TCP_TIME_WAIT;
|
| 2177 |
ps->eventTime = TickGet() + TCP_TIME_WAIT_TIMEOUT_VAL;
|
| 2178 |
}
|
| 2179 |
|
| 2180 |
// Check for application data and make it
|
| 2181 |
// available, if present
|
| 2182 |
flags |= ProcessRXBytes(ps, h, len);
|
| 2183 |
|
| 2184 |
break;
|
| 2185 |
|
| 2186 |
case TCP_CLOSE_WAIT:
|
| 2187 |
flags = ACK;
|
| 2188 |
break;
|
| 2189 |
|
| 2190 |
case TCP_LAST_ACK:
|
| 2191 |
if(h->Flags.bits.flagACK && (h->AckNumber == MyTCB.MySEQ))
|
| 2192 |
{
|
| 2193 |
CloseSocket(hTCP);
|
| 2194 |
}
|
| 2195 |
break;
|
| 2196 |
|
| 2197 |
case TCP_TIME_WAIT:
|
| 2198 |
flags = RST;
|
| 2199 |
break;
|
| 2200 |
}
|
| 2201 |
|
| 2202 |
|
| 2203 |
// Throw away all ACKnowledged TX data
|
| 2204 |
if(h->Flags.bits.flagACK && (ps->smState != TCP_CLOSED) && (ps->smState != TCP_LISTEN))
|
| 2205 |
{
|
| 2206 |
// Calculate what the last acknowledged sequence number was
|
| 2207 |
dwTemp = MyTCB.MySEQ - (LONG)(SHORT)(MyTCB.txUnackedTail - ps->txTail);
|
| 2208 |
if(MyTCB.txUnackedTail < ps->txTail)
|
| 2209 |
dwTemp -= ps->bufferRxStart - ps->bufferTxStart;
|
| 2210 |
|
| 2211 |
// Calcluate how many bytes were ACKed with this packet
|
| 2212 |
dwTemp = h->AckNumber - dwTemp;
|
| 2213 |
if(((LONG)(dwTemp) > 0) && (dwTemp <= ps->bufferRxStart - ps->bufferTxStart))
|
| 2214 |
{
|
| 2215 |
ps->Flags.bHalfFullFlush = FALSE;
|
| 2216 |
|
| 2217 |
// Bytes ACKed, free up the TX FIFO space
|
| 2218 |
ps->txTail += dwTemp;
|
| 2219 |
if(ps->txTail >= ps->bufferRxStart)
|
| 2220 |
{
|
| 2221 |
ps->txTail -= ps->bufferRxStart - ps->bufferTxStart;
|
| 2222 |
}
|
| 2223 |
|
| 2224 |
// No need to keep our retransmit timer going if we having nothing that needs ACKing anymore
|
| 2225 |
if((ps->smState == TCP_ESTABLISHED) && (ps->txTail == MyTCB.txUnackedTail))
|
| 2226 |
ps->Flags.bTimerEnabled = FALSE;
|
| 2227 |
}
|
| 2228 |
}
|
| 2229 |
|
| 2230 |
|
| 2231 |
while(!MACIsMemCopyDone());
|
| 2232 |
MACDiscardRx();
|
| 2233 |
|
| 2234 |
if(flags)
|
| 2235 |
SendTCP(hTCP, flags);
|
| 2236 |
}
|
| 2237 |
|
| 2238 |
/*********************************************************************
|
| 2239 |
* Function: static BYTE ProcessRXBytes(TCB_STUB *ps, TCP_HEADER *h, WORD len)
|
| 2240 |
*
|
| 2241 |
* PreCondition: None
|
| 2242 |
*
|
| 2243 |
* Input: *ps: Pointer to the current TCB_STUB which needs processing
|
| 2244 |
* *h: Pointer to the TCP_HEADER of the TCP packet we received
|
| 2245 |
* len: Number of TCP application layer bytes available
|
| 2246 |
*
|
| 2247 |
* Output: BYTE: Flags that should be transmitted back
|
| 2248 |
*
|
| 2249 |
* Side Effects: None
|
| 2250 |
*
|
| 2251 |
* Overview: None
|
| 2252 |
*
|
| 2253 |
* Note: This is an internal TCP layer function only.
|
| 2254 |
********************************************************************/
|
| 2255 |
static BYTE ProcessRXBytes(TCB_STUB *ps, TCP_HEADER *h, WORD len)
|
| 2256 |
{
|
| 2257 |
WORD wTemp;
|
| 2258 |
LONG lMissingBytes;
|
| 2259 |
WORD wMissingBytes;
|
| 2260 |
WORD wFreeSpace;
|
| 2261 |
|
| 2262 |
// Check for application data and make it
|
| 2263 |
// available, if present
|
| 2264 |
if(!len)
|
| 2265 |
return 0x00;
|
| 2266 |
|
| 2267 |
// Calculate the number of bytes ahead of our head pointer this segment skips
|
| 2268 |
lMissingBytes = h->SeqNumber - MyTCB.RemoteSEQ;
|
| 2269 |
wMissingBytes = (WORD)lMissingBytes;
|
| 2270 |
|
| 2271 |
// Calculate the RX FIFO space
|
| 2272 |
if(ps->rxHead >= ps->rxTail)
|
| 2273 |
wFreeSpace = (ps->bufferEnd - ps->bufferRxStart) - (ps->rxHead - ps->rxTail);
|
| 2274 |
else
|
| 2275 |
wFreeSpace = ps->rxTail - ps->rxHead - 1;
|
| 2276 |
|
| 2277 |
// See if any of the segment data is within our RX window
|
| 2278 |
if(((LONG)wFreeSpace > lMissingBytes) && ((SHORT)wMissingBytes + (SHORT)len > (SHORT)0))
|
| 2279 |
{
|
| 2280 |
// See if there are bytes we must skip
|
| 2281 |
if((SHORT)wMissingBytes <= 0)
|
| 2282 |
{
|
| 2283 |
// Position packet read pointer to start of useful data area.
|
| 2284 |
IPSetRxBuffer((h->DataOffset.Val << 2) - wMissingBytes);
|
| 2285 |
len += wMissingBytes;
|
| 2286 |
MyTCB.RemoteSEQ += (DWORD)len;
|
| 2287 |
|
| 2288 |
// Copy the application data from the packet into the socket RX FIFO
|
| 2289 |
// See if we need a two part copy (spans bufferEnd->bufferRxStart)
|
| 2290 |
if(ps->rxHead + len > ps->bufferEnd)
|
| 2291 |
{
|
| 2292 |
wTemp = ps->bufferEnd - ps->rxHead + 1;
|
| 2293 |
MACMemCopyAsync(ps->rxHead, -1, wTemp);
|
| 2294 |
MACMemCopyAsync(ps->bufferRxStart, -1, len - wTemp);
|
| 2295 |
ps->rxHead = ps->bufferRxStart + (len - wTemp);
|
| 2296 |
}
|
| 2297 |
else
|
| 2298 |
{
|
| 2299 |
MACMemCopyAsync(ps->rxHead, -1, len);
|
| 2300 |
ps->rxHead += len;
|
| 2301 |
}
|
| 2302 |
|
| 2303 |
// See if we have a hole and other data waiting already in the RX FIFO
|
| 2304 |
if(MyTCB.sHoleSize != -1)
|
| 2305 |
{
|
| 2306 |
MyTCB.sHoleSize -= len;
|
| 2307 |
wTemp = MyTCB.wFutureDataSize + MyTCB.sHoleSize;
|
| 2308 |
|
| 2309 |
// See if we just closed up a hole, and if so, advance head pointer
|
| 2310 |
if((SHORT)wTemp < (SHORT)0)
|
| 2311 |
{
|
| 2312 |
MyTCB.sHoleSize = -1;
|
| 2313 |
}
|
| 2314 |
else if(MyTCB.sHoleSize <= 0)
|
| 2315 |
{
|
| 2316 |
MyTCB.RemoteSEQ += wTemp;
|
| 2317 |
ps->rxHead += wTemp;
|
| 2318 |
if(ps->rxHead > ps->bufferEnd)
|
| 2319 |
ps->rxHead -= ps->bufferEnd - ps->bufferRxStart + 1;
|
| 2320 |
MyTCB.sHoleSize = -1;
|
| 2321 |
}
|
| 2322 |
}
|
| 2323 |
} // This packet is out of order or we lost a packet, see if we can generate a hole to accomodate it
|
| 2324 |
else if((SHORT)wMissingBytes > 0)
|
| 2325 |
{
|
| 2326 |
// Position packet read pointer to start of useful data area.
|
| 2327 |
IPSetRxBuffer(h->DataOffset.Val << 2);
|
| 2328 |
|
| 2329 |
// See if we need a two part copy (spans bufferEnd->bufferRxStart)
|
| 2330 |
if(ps->rxHead + wMissingBytes + len > ps->bufferEnd)
|
| 2331 |
{
|
| 2332 |
// Calculate number of data bytes to copy before wraparound
|
| 2333 |
wTemp = ps->bufferEnd - ps->rxHead + 1 - wMissingBytes;
|
| 2334 |
if((SHORT)wTemp >= 0)
|
| 2335 |
{
|
| 2336 |
MACMemCopyAsync(ps->rxHead + wMissingBytes, -1, wTemp);
|
| 2337 |
MACMemCopyAsync(ps->bufferRxStart, -1, len - wTemp);
|
| 2338 |
}
|
| 2339 |
else
|
| 2340 |
{
|
| 2341 |
MACMemCopyAsync(ps->rxHead + wMissingBytes - (ps->bufferEnd - ps->bufferRxStart + 1), -1, len);
|
| 2342 |
}
|
| 2343 |
}
|
| 2344 |
else
|
| 2345 |
{
|
| 2346 |
MACMemCopyAsync(ps->rxHead + wMissingBytes, -1, len);
|
| 2347 |
}
|
| 2348 |
|
| 2349 |
// Record the hole is here
|
| 2350 |
if(MyTCB.sHoleSize == -1)
|
| 2351 |
{
|
| 2352 |
MyTCB.sHoleSize = wMissingBytes;
|
| 2353 |
MyTCB.wFutureDataSize = len;
|
| 2354 |
}
|
| 2355 |
else
|
| 2356 |
{
|
| 2357 |
// We already have a hole, see if we can shrink the hole
|
| 2358 |
// or extend the future data size
|
| 2359 |
if(wMissingBytes < (WORD)MyTCB.sHoleSize)
|
| 2360 |
{
|
| 2361 |
if((wMissingBytes + len > (WORD)MyTCB.sHoleSize + MyTCB.wFutureDataSize) || (wMissingBytes + len < (WORD)MyTCB.sHoleSize))
|
| 2362 |
MyTCB.wFutureDataSize = len;
|
| 2363 |
else
|
| 2364 |
MyTCB.wFutureDataSize = (WORD)MyTCB.sHoleSize + MyTCB.wFutureDataSize - wMissingBytes;
|
| 2365 |
MyTCB.sHoleSize = wMissingBytes;
|
| 2366 |
}
|
| 2367 |
else if(wMissingBytes + len > (WORD)MyTCB.sHoleSize + MyTCB.wFutureDataSize)
|
| 2368 |
{
|
| 2369 |
MyTCB.wFutureDataSize += wMissingBytes + len - (WORD)MyTCB.sHoleSize - MyTCB.wFutureDataSize;
|
| 2370 |
}
|
| 2371 |
|
| 2372 |
}
|
| 2373 |
|
| 2374 |
// Request a fast retransmit from remote node by sending three duplicate ACKs
|
| 2375 |
//SendTCP(hTCP, ACK);
|
| 2376 |
//while(!MACIsTxReady());
|
| 2377 |
//MACFlush();
|
| 2378 |
//while(!MACIsTxReady());
|
| 2379 |
//MACFlush();
|
| 2380 |
}
|
| 2381 |
}
|
| 2382 |
|
| 2383 |
// Make sure that we immediately send back an ack for the
|
| 2384 |
// second segment received
|
| 2385 |
if(ps->Flags.bOneSegmentReceived)
|
| 2386 |
return ACK;
|
| 2387 |
|
| 2388 |
ps->Flags.bOneSegmentReceived = TRUE;
|
| 2389 |
|
| 2390 |
// Do not send an ACK immediately back. Instead, we will
|
| 2391 |
// perform delayed acknowledgements. To do this, we will
|
| 2392 |
// just start a timer
|
| 2393 |
if(!ps->Flags.bDelayedACKTimerEnabled)
|
| 2394 |
{
|
| 2395 |
ps->Flags.bDelayedACKTimerEnabled = TRUE;
|
| 2396 |
ps->delayedACKTime = (WORD)TickGet() + (WORD)(TICK_SECOND/5);
|
| 2397 |
}
|
| 2398 |
|
| 2399 |
return 0;
|
| 2400 |
}
|
| 2401 |
|
| 2402 |
#endif //#if defined(STACK_USE_TCP)
|
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