Module sockopt

Socket options as used by setsockopt and getsockopt.

Structs

AcceptConn

Returns a value indicating whether or not this socket has been marked to accept connections with listen(2).

AlgSetAeadAuthSize

AlgSetKey

AttachReusePortCbpf

To be used with ReusePort, we can then attach a BPF (classic) to set how the packets are assigned to the socket (e.g. cpu distribution).

BindToDevice

Bind this socket to a particular device like “eth0”.

Broadcast

Set or get the broadcast flag.

DontRoute

Set or get the don’t route flag.

Ip6tOriginalDst

IpMtu

Fetch the current system-estimated Path MTU.

Ipv4RecvErr

Enable extended reliable error message passing.

Ipv4Ttl

Set or retrieve the current time-to-live field that is used in every packet sent from this socket.

Ipv6DontFrag

Set “don’t fragment packet” flag on the IPv6 packet.

Ipv6RecvErr

Control receiving of asynchronous error options.

Ipv6Ttl

Set the unicast hop limit for the socket.

KeepAlive

Enable sending of keep-alive messages on connection-oriented sockets.

Linger

When enabled, a close(2) or shutdown(2) will not return until all queued messages for the socket have been successfully sent or the linger timeout has been reached.

Mark

Set the mark for each packet sent through this socket (similar to the netfilter MARK target but socket-based).

OobInline

If this option is enabled, out-of-band data is directly placed into the receive data stream.

PassCred

Enable or disable the receiving of the SCM_CREDENTIALS control message.

PeerCredentials

Return the credentials of the foreign process connected to this socket.

PeerPidfd

Return the pidfd of the foreign process connected to this socket.

RcvBuf

Sets or gets the maximum socket receive buffer in bytes.

RcvBufForce

Using this socket option, a privileged (CAP_NET_ADMIN) process can perform the same task as SO_RCVBUF, but the rmem_max limit can be overridden.

ReceiveTimeout

Specify the receiving timeout until reporting an error.

ReceiveTimestamp

Enable or disable the receiving of the SO_TIMESTAMP control message.

ReceiveTimestampns

Enable or disable the receiving of the SO_TIMESTAMPNS control message.

ReuseAddr

Enables local address reuse

ReusePort

Permits multiple AF_INET or AF_INET6 sockets to be bound to an identical socket address.

RxqOvfl

Indicates that an unsigned 32-bit value ancillary message (cmsg) should be attached to received skbs indicating the number of packets dropped by the socket since its creation.

SendTimeout

Specify the sending timeout until reporting an error.

SndBuf

Sets or gets the maximum socket send buffer in bytes.

SndBufForce

Using this socket option, a privileged (CAP_NET_ADMIN) process can perform the same task as SO_SNDBUF, but the wmem_max limit can be overridden.

SockType

Gets the socket type as an integer.

SocketError

Get and clear the pending socket error.

TcpMaxSeg

The maximum segment size for outgoing TCP packets.

TcpNoDelay

Used to disable Nagle’s algorithm.

TcpRepair

TcpTlsRx

Set the Kernel TLS read parameters on the TCP socket.

TcpTlsTx

Set the Kernel TLS write parameters on the TCP socket.

TcpUlp

Set the Upper Layer Protocol (ULP) on the TCP socket.

Timestamping

Specifies exact type of timestamping information collected by the kernel Further reading

TxTime

Configures the behavior of time-based transmission of packets, for use with the TxTime control message.

Enums

TlsCryptoInfo

Value used with the TcpTlsTx and TcpTlsRx socket options.