Method setSockOptTCP

pkg/sentry/socket/netstack/netstack.go:2232–2396

setSockOptTCP implements linux setsockopt(2) when the level is SOL_TCP.

(t *kernel.Task, ep commonEndpoint, name int, optVal []byte)

// setSockOptTCP implements linux setsockopt(2) when the level is SOL_TCP.
func (s *sock) setSockOptTCP(t *kernel.Task, ep commonEndpoint, name int, optVal []byte) *syserr.Error {
	if !socket.IsTCP(s) {
		return syserr.ErrUnknownProtocolOption
	}

	switch name {
	case linux.TCP_NODELAY:
		if len(optVal) < sizeOfInt32 {
			return syserr.ErrInvalidArgument
		}

		v := hostarch.ByteOrder.Uint32(optVal)
		ep.SocketOptions().SetDelayOption(v == 0)
		return nil

	case linux.TCP_CORK:
		if len(optVal) < sizeOfInt32 {
			return syserr.ErrInvalidArgument
		}

		v := hostarch.ByteOrder.Uint32(optVal)
		ep.SocketOptions().SetCorkOption(v != 0)
		return nil

	case linux.TCP_QUICKACK:
		if len(optVal) < sizeOfInt32 {
			return syserr.ErrInvalidArgument
		}

		v := hostarch.ByteOrder.Uint32(optVal)
		ep.SocketOptions().SetQuickAck(v != 0)
		return nil

	case linux.TCP_MAXSEG:
		if len(optVal) < sizeOfInt32 {
			return syserr.ErrInvalidArgument
		}

		v := hostarch.ByteOrder.Uint32(optVal)
		return syserr.TranslateNetstackError(ep.SetSockOptInt(tcpip.MaxSegOption, int(v)))

	case linux.TCP_KEEPIDLE:
		if len(optVal) < sizeOfInt32 {
			return syserr.ErrInvalidArgument
		}

		v := hostarch.ByteOrder.Uint32(optVal)
		if v < 1 || v > linux.MAX_TCP_KEEPIDLE {
			return syserr.ErrInvalidArgument
		}
		opt := tcpip.KeepaliveIdleOption(time.Second * time.Duration(v))
		return syserr.TranslateNetstackError(ep.SetSockOpt(&opt))

	case linux.TCP_KEEPINTVL:
		if len(optVal) < sizeOfInt32 {
			return syserr.ErrInvalidArgument
		}