TcpOption.h

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#ifndef _TCP_OPTION_H_
#define _TCP_OPTION_H_
 
//
// Supported TCP option types and their length.
//
#define TCP_OPTION_EOP             0  
#define TCP_OPTION_NOP             1  
#define TCP_OPTION_MSS             2  
#define TCP_OPTION_WS              3  
#define TCP_OPTION_TS              8  
#define TCP_OPTION_MSS_LEN         4  
#define TCP_OPTION_WS_LEN          3  
#define TCP_OPTION_TS_LEN          10 
#define TCP_OPTION_WS_ALIGNED_LEN  4  
#define TCP_OPTION_TS_ALIGNED_LEN  12 
 
//
// recommend format of timestamp window scale
// option for fast process.
//
#define TCP_OPTION_TS_FAST  ((TCP_OPTION_NOP << 24) |\
                            (TCP_OPTION_NOP << 16) | \
                            (TCP_OPTION_TS << 8)   | \
                            (TCP_OPTION_TS_LEN))
 
#define TCP_OPTION_WS_FAST  ((TCP_OPTION_NOP << 24) |  \
                              (TCP_OPTION_WS << 16)  | \
                              (TCP_OPTION_WS_LEN << 8))
 
#define TCP_OPTION_MSS_FAST  ((TCP_OPTION_MSS << 24) | (TCP_OPTION_MSS_LEN << 16))
 
//
// Other misc definitions
//
#define TCP_OPTION_RCVD_MSS  0x01
#define TCP_OPTION_RCVD_WS   0x02
#define TCP_OPTION_RCVD_TS   0x04
#define TCP_OPTION_MAX_WS    14            
#define TCP_OPTION_MAX_WIN   0xffff        
 
typedef struct _TCP_OPTION {
  UINT8     Flag;     
  UINT8     WndScale; 
  UINT16    Mss;      
  UINT32    TSVal;    
  UINT32    TSEcr;    
} TCP_OPTION;
 
UINT8
TcpComputeScale (
  IN TCP_CB  *Tcb
  );
 
UINT16
TcpSynBuildOption (
  IN TCP_CB   *Tcb,
  IN NET_BUF  *Nbuf
  );
 
UINT16
TcpBuildOption (
  IN TCP_CB   *Tcb,
  IN NET_BUF  *Nbuf
  );
 
INTN
TcpParseOption (
  IN     TCP_HEAD    *Tcp,
  IN OUT TCP_OPTION  *Option
  );
 
#endif