NF_STATUS nf_tcpSetSockOpt(ENDPOINT_ID id, int optname, const char* optval, int optlen)
NF_STATUS_SUCCESS on success, or other NF_STATUS error code on fail.
It is possible to change TCP/IP options for the specified active TCP connection.
This is analogue of setsockopt() function from WinSock API.
The following options are supported:
| optname | WinSock equivalent | optval type | Description |
|---|---|---|---|
| TCP_SOCKET_NODELAY=1 | TCP_NODELAY |
DWORD
(boolean) |
Enables or disables the Nagle algorithm for TCP sockets. This option is disabled (set to FALSE) by default. |
| TCP_SOCKET_KEEPALIVE=2 | SO_KEEPALIVE |
DWORD (boolean) |
Enables sending keep-alive packets for a socket connection. |
| TCP_SOCKET_OOBINLINE=3 | SO_OOBINLINE |
DWORD (boolean) |
Indicates that out-of-bound data should be returned in-line with regular data. |
| TCP_SOCKET_BSDURGENT=4 | TCP_BSDURGENT |
DWORD
(boolean) |
If TRUE, the service provider implements the Berkeley Software Distribution (BSD) style (default) for handling expedited data. This option is the inverse of the TCP_EXPEDITED_1122 option. This option can be set on the connection only once. Once this option is set on, this option cannot be turned off. This option is not required to be implemented by service providers. The option is enabled (set to TRUE) by default. |
| TCP_SOCKET_ATMARK=5 | struct TCPSocketAMInfo |
optval must point to the following structure: typedef struct TCPSocketAMInfo { ulong tsa_size; // Size of urgent data returned long tsa_offset; // Offset of urgent data returned. } TCPSocketAMInfo; The tsa_offset field indicate how far back or forward in the data stream urgent data was or will be returned. A negative value means inline urgent data has already been given to the client, -tsa_offset bytes ago. A positive value means that inline urgent data is available tsa_offset bytes down the data stream. The tsa_size field is the size in bytes of the urgent data. This call when always return a 0 size and offset if the connection is not in the urgent inline mode. |
|
| TCP_SOCKET_WINDOW=6 | DWORD | Socket window size |
| Driver type | WFP, TDI |
| Header | nfapi.h |
| Library | nfapi.lib |