TcpOpenCommand¶

//
// Control info to be used for active or passive TCP open.
//
// localAddr, remoteAddr, localPort, remotePort should be self-explanatory.
// localAddr is optional because TCP can learn it from IP when a packet
// is received from the peer; localPort is optional because TCP supports
// ephemeral ports.
//
// The fork parameter is used with passive open, and controls what happens
// when an incoming connection is received. With fork=true, it emulates
// the Unix accept(2) syscall semantics: a new connection structure
// is created for the connection (with a new connId, see in ~TcpCommand),
// and the connection structure with the old connId remains listening.
// With fork=false, all the above does not happen: the first connection
// is accepted (with the original connId), and further incoming connections
// will be refused by TCP by sending an RST segment.
//
// The tcpAlgorithmClass field allows per-connection TCP configuration.
// The tcpAlgorithmClass field may contain name of class subclassed from
// TcpAlgorithm, respectively.
// If not set, module parameters with similar names are used.
//
// @see ~TcpCommandCode, ~ITcp
//
class TcpOpenCommand extends TcpCommand
{
    L3Address localAddr;   // may be left empty
    L3Address remoteAddr;  // required for active open
    int localPort = -1;    // required for passive open
    int remotePort = -1;   // required for active open
    bool fork = false;     // used only for passive open
    bool autoRead = true;  // true: TCPs sends up arrived data automatically. false: should use read command
    string tcpAlgorithmClass; // TCP congestion control algorithm; leave empty for default
}