www.pudn.com > TcpIpOn8051.rar > TCP.H

/* ***** TCP (Transmission Control Protocol) header ***** */ 
typedef struct 
{ 
    WORD  sport,            // Source port  
          dport;            // Destination port  
    DWORD seq,              // Sequence number  
          ack;              // Ack number  
    BYTE  hlen,             // TCP header len (num of bytes << 2)  
          flags;            // Option flags  
    WORD  window,           // Flow control credit (num of bytes)  
          check,            // Checksum  
          urgent;           // Urgent data pointer  
}tcpheader; 
#define TFIN        0x01    // Option flags: no more data  
#define TSYN        0x02    //           sync sequence nums  
#define TRST        0x04    //           reset connection  
#define TPUSH       0x08    //           push buffered data  
#define TACK        0x10    //           acknowledgement  
#define TURGE       0x20    //          urgent  
 
/* ***** TCP packet ('segment') ***** */ 
typedef struct 
{ 
    ipheader   i;              // IP header  
    tcpheader  t;              // TCP header  
    BYTE       tcpdata[MAXDATA];  // Data area (oversized)  
}tcppacket; 
 
// TCP definitions for 'Creating TCP/IP from scratch'  
 
// Well-known TCP port numbers  
#define echoport    7       // Echo  
#define dayport     13      // Daytime  
//#define charport    19      // Character generator  
#define telport     23      // Telnet remote login  
#define httpport    80    	// HTTP  
#define mineport    1024    // Start of ephemeral (temporary) port numbers  
#define maxeport    5000    // Max ephemeral port number  
 
// Dummy values for the segment data length  
#define DLEN_NODATA -1      // Segment received, but no data  
#define CBUFFLEN 0x400 
typedef struct 
{ 
    WORD len;                   // Length of data (must be first)  
    DWORD in;                   // Incoming data  
    DWORD out;                  // Outgoing data  
    DWORD trial;                // Outgoing data 'on trial'  
//send data buffer para 
	BYTE yesornot;				//flag of send data or not,tx and rx 
	BYTE flags;					//tcp flags,only use in tx 
	DWORD seqnum;				//seq number,tx 
	DWORD acknum;				//acknumber,tx 
	WORD spoint;				//the start addr of send data 
	WORD dlen;					//length of data to send,tx and rx 
//data 
    BYTE tdata[CBUFFLEN];      // Buffer  
} CBUFF; 
 
typedef enum { 
    // Passive open & close  
    TCP_CLOSED,             // Closed  
    TCP_SYNR,               // SYN recvd: send SYN ACK  
    TCP_EST,                // Established: connection OK  
    TCP_CLWAIT,             // Close wait: FIN recvd, send data then FIN ACK  
    TCP_LASTACK,            // Last ACK: waiting for ACK of my FIN  
    TCP_RSTR,               // Reset received  
    // Active open and close  
	TCP_AOPEN, 
    TCP_SYNS,               // SYN sent: awaiting SYN ACK  
                            // Established: same as for passive open  
    TCP_ACLOSE,             // Active close: send FIN  
    TCP_FINWT1,             // FIN wait 1: FIN sent, waiting for ACK  
    TCP_FINWT2,             // FIN wait 2: receiving data, waiting for FIN  
    TCP_CLING,              // Closing: awaiting final ACK  
    TCP_TWAIT               // Timed wait  
} TCP_STATE; 
 
// Simplified connection states for applications  
typedef enum { 
    TCP_IDLE,               // Idle  
    TCP_OPEN,               // Opening connection  
    TCP_CONN,               // Connected  
    TCP_DATA,               // Connected, data received  
    TCP_NODATA,             // Connected, no data received  
    TCP_CLOSE               // Closing connection  
} CONN_STATE; 
 
// Storage structure for a single TCP socket 
// The positions of the first 3 items are fixed to simplify initialisation  
typedef struct { 
    WORD        index;          // Index number - must be first 
    CBUFF      	rxbuf;         	// Receive & transmit circular buffers  
    CBUFF      	txbuf;        	// (must be 2nd and 3rd) 
    ip          remip;          // remote ip  
	WORD 		locport;		//local port 
	WORD		remport;		//remote port 
    TCP_STATE   state;          // Current connection state  
    WORD        server;         // Flag to identify server socket  
    DWORD       time;           // Time at last state change (msec)  
    WORD        timeout,        // Timeout value (0=no timeout)  
                retries;        // Number of retries left  
    WORD        txmss,          // Max seg data size for my transmit  
                rxwin,          // Current Rx & Tx window sizes  
                txwin; 
    DWORD       rxseq,          // Seq & ack values in latest Rx segment  
                rxack; 
    BYTE        txflags,        // Latest Tx flags  
                connflags;      // Extra Tx connection flags (push/urgent)  
    WORD        txdlen;         // Latest transmit data length   
    void        *app;           // Pointer to application-specific data  
} TCP_SOCK; 
#define nsocks 2  
// Telnet option byte values (subset)  
#define TEL_IAC     255         // Interpret As Command  
#define TEL_DONT    254         // Don't do it  
#define TEL_DO      253         // Do it  
#define TEL_WONT    252         // Won't do it  
#define TEL_WILL    251         // Will do it  
#define TEL_ECHO    1           // Echo option  
#define TEL_SGA     3           // Suppress Go-Ahead option  
#define TEL_AUTH    37          // Authentication option