MIB_TCPROW2 (Compact 2013)

3/26/2014

This structure contains information that describes an IPv4 TCP connection.

Syntax

typedef struct _MIB_TCPROW2 {
  DWORD dwState;
  DWORD dwLocalAddr;
  DWORD dwLocalPort;
  DWORD dwRemoteAddr;
  DWORD dwRemotePort;
  TCP_CONNECTION_OFFLOAD_STATE dwOffloadState;
} MIB_TCPROW2,
  *PMIB_TCPROW2;

Members

• dwState
  The state of the TCP connection. This member can be one of the values that are defined in the Iprtrmib.h header file.

  The header file organization has changed. This member can be one of the values from the MIB_TCP_STATE enumeration defined in the Tcpmib.h header file, not in the *Iprtrmib.*h header file. Note that the Tcpmib.h header file is automatically included in Iprtrmib.h, which is automatically included in the Iphlpapi.h header file. The Tcpmib.h and Iprtrmib.h header files should never be used directly.

  Value	Meaning
  MIB_TCP_STATE_CLOSED 1	The TCP connection is in the CLOSED state that represents no connection state at all.
  MIB_TCP_STATE_LISTEN 2	The TCP connection is in the LISTEN state waiting for a connection request from any remote TCP and port.
  MIB_TCP_STATE_SYN_SENT 3	The TCP connection is in the SYN-SENT state waiting for a matching connection request after having sent a connection request (SYN packet).
  MIB_TCP_STATE_SYN_RCVD 4	The TCP connection is in the SYN-RECEIVED state waiting for a confirming connection request acknowledgement after having both received and sent a connection request (SYN packet).
  MIB_TCP_STATE_ESTAB 5	The TCP connection is in the ESTABLISHED state that represents an open connection, data that is received can be delivered to the user. This is the usual state for the data transfer phase of the TCP connection.
  MIB_TCP_STATE_FIN_WAIT1 6	The TCP connection is FIN-WAIT-1 state waiting for a connection termination request from the remote TCP, or an acknowledgement of the connection termination request previously sent.
  MIB_TCP_STATE_FIN_WAIT2 7	The TCP connection is FIN-WAIT-1 state waiting for a connection termination request from the remote TCP.
  MIB_TCP_STATE_CLOSE_WAIT 8	The TCP connection is in the CLOSE-WAIT state waiting for a connection termination request from the local user.
  MIB_TCP_STATE_CLOSING 9	The TCP connection is in the CLOSING state waiting for a connection termination request acknowledgement from the remote TCP.
  MIB_TCP_STATE_LAST_ACK 10	The TCP connection is in the LAST-ACK state waiting for an acknowledgement of the connection termination request previously sent to the remote TCP (which includes an acknowledgement of its connection termination request).
  MIB_TCP_STATE_TIME_WAIT 11	The TCP connection is in the TIME-WAIT state waiting for enough time to pass to make sure that the remote TCP received the acknowledgement of its connection termination request.
  MIB_TCP_STATE_DELETE_TCB 12	The TCP connection is in the delete TCB state that represents the deletion of the Transmission Control Block (TCB), a data structure used to maintain information on each TCP entry.

• dwLocalAddr
  The local IPv4 address for the TCP connection on the local device. A value of zero indicates the listener can accept a connection on any interface.

• dwLocalPort
  The local port number in network byte order for the TCP connection on the local device.

• dwRemoteAddr
  The IPv4 address for the TCP connection on the remote computer. When the dwState member is MIB_TCP_STATE_LISTEN, this value has no meaning.

• dwRemotePort
  The remote port number in network byte order for the TCP connection on the remote device. When the dwState member is MIB_TCP_STATE_LISTEN, this member has no meaning.

• dwOffloadState
  The offload state for this TCP connection. This parameter can be one of the enumeration values for the TCP_CONNECTION_OFFLOAD_STATE defined in the Tcpmib.h header.

Remarks

The GetTcpTable2 function retrieves the IPv4 TCP connection table on the local device and returns this information in a MIB_TCPTABLE2 structure. An array of MIB_TCPROW2 structures are contained in the MIB_TCPTABLE2 structure.

The dwState member indicates the state of the TCP entry in a TCP state diagram. A TCP connection progresses through a series of states during its lifetime. The states are as follows: LISTEN, SYN-SENT, SYN-RECEIVED, ESTABLISHED, FIN-WAIT-1, FIN-WAIT-2, CLOSE-WAIT, CLOSING, LAST-ACK, TIME-WAIT, and the fictional state CLOSED. The CLOSED state is fictional because it represents the state when there is no Transmission Control Block, and therefore, no connection. The TCP protocol is described in RFC 793.

The dwLocalPort, and dwRemotePort members are in network byte order. In order to use the dwLocalPort or dwRemotePort members, the ntohs or inet_ntoa functions in Windows Sockets or similar functions may be needed. The dwLocalAddr and dwRemoteAddr members are stored as a DWORD in the same format as the in_addr structure. In order to use the dwLocalAddr or dwRemoteAddr members, the ntohl or inet_ntoa functions in Windows Sockets or similar functions may be needed.

Requirements

Header

ws2def.h, ws2ipdef.h

See Also

Reference

MIB Structures
GetTcp6Table
GetTcp6Table2
GetTcpTable
GetTcpTable2
in_addr
inet_ntoa
MIB_TCP6ROW
MIB_TCP6ROW2
MIB_TCP6TABLE
MIB_TCP6TABLE2
MIB_TCPTABLE
MIB_TCPTABLE2
ntohl
ntohs
SetTcpEntry
TCP_CONNECTION_OFFLOAD_STATE