ponsim/v2/core/ponsim_onu.go - voltha - Gitiles

 /*
  * Copyright 2017-present Open Networking Foundation

  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at

  * http://www.apache.org/licenses/LICENSE-2.0

  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 package core

 import (
 	"context"
 	"crypto/tls"
 	"github.com/golang/protobuf/ptypes/empty"
 	"github.com/google/gopacket"
 	"github.com/google/uuid"
 	"github.com/opencord/voltha/ponsim/v2/common"
 	"github.com/opencord/voltha/protos/go/ponsim"
 	"github.com/sirupsen/logrus"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
 	"strconv"
 	"strings"
 	"sync"
 	"time"
 )

 // TODO: Cleanup GRPC security config
 // TODO: Pass-in the certificate information as a structure parameter

 /*
 PonSimOnuDevice is the structure responsible for the handling of an ONU device
 */
 type PonSimOnuDevice struct {
 	PonSimDevice

 	ParentAddress string
 	ParentPort    int32
 	AssignedPort  int32
 	Conn          *grpc.ClientConn

 	oltClient ponsim.PonSimCommonClient
 	stream    ponsim.PonSimCommon_ProcessDataClient
 	monitor   chan PonSimDeviceState
 	state     PonSimDeviceState
 }

 /*
 NewPonSimOnuDevice instantiates a new ONU device structure
 */
 func NewPonSimOnuDevice(device PonSimDevice) *PonSimOnuDevice {
 	onu := &PonSimOnuDevice{PonSimDevice: device}

 	return onu
 }

 /*
 forwardToOLT defines a INGRESS function to forward a packet to the parent OLT
 */
 func (o *PonSimOnuDevice) forwardToOLT() func(int, gopacket.Packet) {
 	return func(port int, frame gopacket.Packet) {
 		ipAddress := common.GetInterfaceIP(o.InternalIf)
 		incoming := &ponsim.IncomingData{
 			Id:      "INGRESS.ONU." + ipAddress,
 			Address: ipAddress,
 			Port:    int32(port),
 			Payload: frame.Data(),
 		}
 		common.Logger().WithFields(logrus.Fields{
 			"device":    o,
 			"port":      port,
 			"frame":     frame,
 			"frameDump": frame.Dump(),
 			"incoming":  incoming,
 		}).Debug("Forwarding to OLT")

 		// Forward packet to OLT
 		if err := o.stream.Send(incoming); err != nil {
 			common.Logger().WithFields(logrus.Fields{
 				"device":    o,
 				"port":      port,
 				"frameDump": frame.Dump(),
 				"incoming":  incoming,
 			}).Fatal("A problem occurred while forwarding to OLT")
 		}
 	}
 }

 /*
 forwardToWAN defines a EGRESS function to forward a packet to the world
 */
 func (o *PonSimOnuDevice) forwardToWAN() func(int, gopacket.Packet) {
 	return func(port int, frame gopacket.Packet) {
 		var err error
 		common.Logger().WithFields(logrus.Fields{
 			"device": o,
 			"port":   port,
 			"frame":  frame,
 		}).Debug("Forwarding packet to world")
 		if err = o.ingressHandler.WritePacketData(frame.Data()); err != nil {
 			common.Logger().WithFields(logrus.Fields{
 				"device": o,
 				"port":   port,
 				"frame":  frame,
 			}).Fatal("Problem while forwarding packet to world")
 		} else {
 			common.Logger().WithFields(logrus.Fields{
 				"device": o,
 				"port":   port,
 				"frame":  frame,
 			}).Debug("Forwarded packet to world")
 		}
 	}
 }

 /*
 Start performs setup operations for an ONU device
 */
 func (o *PonSimOnuDevice) Start(ctx context.Context) {
 	// Initialize the parent
 	o.PonSimDevice.Start(ctx)

 	// Setup flow behaviours
 	// ONU -> OLT
 	o.AddLink(1, 0, o.forwardToOLT())
 	// ONU -> World
 	o.AddLink(2, 0, o.forwardToWAN())

 	go o.MonitorConnection(ctx)
 }

 /*
 Stop performs cleanup operations for an ONU device
 */
 func (o *PonSimOnuDevice) Stop(ctx context.Context) {
 	common.Logger().WithFields(logrus.Fields{
 		"device": o,
 	}).Debug("Stopping ONU")

 	o.RemoveLink(1, 0)
 	o.RemoveLink(2, 0)

 	o.PonSimDevice.Stop(ctx)
 }

 /*
 Listen waits for incoming INGRESS data on the external interface
 */
 func (o *PonSimOnuDevice) Listen(ctx context.Context) {
 	var reply *empty.Empty
 	var err error

 	if o.oltClient = ponsim.NewPonSimCommonClient(o.Conn); o.oltClient == nil {
 		common.Logger().WithFields(logrus.Fields{
 			"device": o,
 		}).Fatal("Problem establishing client connection to OLT")
 		panic("Problem establishing client connection to OLT")
 	}

 	// Establish GRPC connection with OLT
 	if o.stream, err = o.oltClient.ProcessData(ctx); err != nil {
 		common.Logger().WithFields(logrus.Fields{
 			"device": o,
 			"error":  err.Error(),
 		}).Fatal("Problem establishing stream")
 		panic(err)
 	}

 	defer o.ingressHandler.Close()
 	packetSource := gopacket.NewPacketSource(o.ingressHandler, o.ingressHandler.LinkType())
 	common.Logger().WithFields(logrus.Fields{
 		"device":    o,
 		"interface": o.ExternalIf,
 	}).Debug("Listening to incoming ONU data")

 	for packet := range packetSource.Packets() {
 		common.Logger().WithFields(logrus.Fields{
 			"device": o,
 			"packet": packet,
 		}).Debug("Received INGRESS packet")

 		o.Forward(ctx, 2, packet)
 	}

 	common.Logger().WithFields(logrus.Fields{
 		"device": o,
 	}).Debug("No more packets to process")

 	if reply, err = o.stream.CloseAndRecv(); err != nil {
 		common.Logger().Fatal("A problem occurred while closing Ingress stream", err.Error())
 	} else {
 		common.Logger().Info("Ingress stream closed", reply)
 	}
 }

 /*
 Register sends a registration request to the remote OLT
 */
 func (o *PonSimOnuDevice) Register(ctx context.Context) error {
 	var err error
 	var rreq *ponsim.RegistrationRequest
 	var rrep *ponsim.RegistrationReply
 	var client ponsim.PonSimOltClient

 	if o.Conn != nil {
 		if client = ponsim.NewPonSimOltClient(o.Conn); client != nil {
 			rreq = &ponsim.RegistrationRequest{
 				Id:      uuid.New().String(),
 				Address: common.GetInterfaceIP(o.InternalIf),
 				Port:    o.Port,
 			}
 			common.Logger().Printf("Request details %+v\n", rreq)

 			// TODO: Loop registration until an OLT becomes available??

 			rrep, err = client.Register(ctx, rreq)
 			if err != nil {
 				common.Logger().Printf("Problem with registration", err.Error())
 			} else {
 				// Save OLT address details
 				o.ParentAddress = rrep.GetParentAddress()
 				o.ParentPort = rrep.GetParentPort()
 				o.AssignedPort = rrep.GetAssignedPort()

 				common.Logger().Printf("Registration details - %+v\n", rrep)

 				o.monitor <- REGISTERED_WITH_OLT
 			}

 		} else {
 			common.Logger().Info("Client is NIL")
 		}
 	}

 	return err
 }

 /*
 MonitorConnection verifies the communication with the OLT
 */
 func (o *PonSimOnuDevice) MonitorConnection(ctx context.Context) {
 	for {
 		if o.state == DISCONNECTED_FROM_PON {
 			// Establish communication with OLT
 			o.Connect(ctx)
 		}

 		if o.state == CONNECTED_TO_PON {
 			// Just stay idle while the ONU-OLT connection is up
 			o.Conn.WaitForStateChange(ctx, o.Conn.GetState())

 			// The ONU-OLT connection was lost... need to cleanup
 			o.Disconnect(ctx)
 		}

 		time.Sleep(1 * time.Second)
 	}
 }

 /*
 Connect sets up communication and monitoring with remote OLT
 */
 func (o *PonSimOnuDevice) Connect(ctx context.Context) {
 	o.monitor = make(chan PonSimDeviceState, 1)

 	// Define a waitgroup to block the current routine until
 	// a CONNECTED state is reached
 	wg := sync.WaitGroup{}
 	wg.Add(1)

 	go o.MonitorState(ctx, &wg)

 	o.ConnectToRemoteOlt()

 	// Wait until we establish a connection to the remote PON
 	wg.Wait()
 }

 /*
 Disconnect tears down communication and monitoring with remote OLT
 */
 func (o *PonSimOnuDevice) Disconnect(ctx context.Context) {
 	if o.egressHandler != nil {
 		o.egressHandler.Close()
 		o.egressHandler = nil
 	}

 	if o.Conn != nil {
 		o.Conn.Close()
 		o.Conn = nil
 	}

 	if o.monitor != nil {
 		close(o.monitor)
 		o.monitor = nil
 		o.state = DISCONNECTED_FROM_PON
 	}
 }

 /*
 MonitorState follows the progress of the OLT connection
 */
 func (o *PonSimOnuDevice) MonitorState(ctx context.Context, wg *sync.WaitGroup) {
 	// Start a concurrent routine to handle ONU state changes
 	var ok bool
 	for {
 		select {
 		case o.state, ok = <-o.monitor:
 			if ok {
 				common.Logger().WithFields(logrus.Fields{
 					"device": o,
 					"state":  o.state,
 				}).Info("Received monitoring state")

 				switch o.state {
 				case CONNECTED_TO_PON:
 					// We have successfully connected to the OLT
 					// proceed with registration
 					wg.Done()

 					if err := o.Register(ctx); err != nil {
 						o.Disconnect(ctx)
 					}

 				case DISCONNECTED_FROM_PON:
 					// Connection to remote OLT was lost... exit
 					common.Logger().WithFields(logrus.Fields{
 						"device": o,
 					}).Warn("Exiting due to disconnection")
 					return

 				case REGISTERED_WITH_OLT:
 					// Start listening on network interfaces
 					o.connectNetworkInterfaces()
 					o.monitor <- CONNECTED_IO_INTERFACE

 				case CONNECTED_IO_INTERFACE:
 					// Start listening on local interfaces
 					go o.Listen(ctx)
 				}
 			} else {
 				common.Logger().WithFields(logrus.Fields{
 					"device": o,
 				}).Warn("Monitoring channel has closed")
 				return
 			}
 		case <-ctx.Done():
 			common.Logger().WithFields(logrus.Fields{
 				"device": o,
 			}).Warn("Received a cancellation notification")

 			return
 		}
 	}
 }

 /*
 ConnectToRemoteOlt establishes GRPC communication with the remote OLT
 */
 func (o *PonSimOnuDevice) ConnectToRemoteOlt() {
 	common.Logger().WithFields(logrus.Fields{
 		"device": o,
 	}).Debug("Connecting to remote device")

 	var err error

 	host := strings.Join([]string{
 		o.ParentAddress,
 		strconv.Itoa(int(o.ParentPort)),
 	}, ":")

 	// TODO: make it secure
 	// GRPC communication needs to be secured
 	ta := credentials.NewTLS(&tls.Config{
 		//Certificates:       []tls.Certificate{peerCert},
 		//RootCAs:            caCertPool,
 		InsecureSkipVerify: true,
 	})

 	if o.Conn, err = grpc.DialContext(
 		context.Background(), host, grpc.WithTransportCredentials(ta), grpc.WithBlock(),
 	); err != nil {
 		common.Logger().WithFields(logrus.Fields{
 			"device": o,
 			"error":  err.Error(),
 		}).Error("Problem establishing connection")
 	} else {
 		// We are now connected
 		// time to move on
 		common.Logger().WithFields(logrus.Fields{
 			"device": o,
 		}).Info("Connected to OLT")
 	}

 	o.monitor <- CONNECTED_TO_PON
 }
	/*
	* Copyright 2017-present Open Networking Foundation

	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at

	* http://www.apache.org/licenses/LICENSE-2.0

	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
	package core

	import (
	"context"
	"crypto/tls"
	"github.com/golang/protobuf/ptypes/empty"
	"github.com/google/gopacket"
	"github.com/google/uuid"
	"github.com/opencord/voltha/ponsim/v2/common"
	"github.com/opencord/voltha/protos/go/ponsim"
	"github.com/sirupsen/logrus"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials"
	"strconv"
	"strings"
	"sync"
	"time"
	)

	// TODO: Cleanup GRPC security config
	// TODO: Pass-in the certificate information as a structure parameter

	/*
	PonSimOnuDevice is the structure responsible for the handling of an ONU device
	*/
	type PonSimOnuDevice struct {
	PonSimDevice

	ParentAddress string
	ParentPort int32
	AssignedPort int32
	Conn *grpc.ClientConn

	oltClient ponsim.PonSimCommonClient
	stream ponsim.PonSimCommon_ProcessDataClient
	monitor chan PonSimDeviceState
	state PonSimDeviceState
	}

	/*
	NewPonSimOnuDevice instantiates a new ONU device structure
	*/
	func NewPonSimOnuDevice(device PonSimDevice) *PonSimOnuDevice {
	onu := &PonSimOnuDevice{PonSimDevice: device}

	return onu
	}

	/*
	forwardToOLT defines a INGRESS function to forward a packet to the parent OLT
	*/
	func (o *PonSimOnuDevice) forwardToOLT() func(int, gopacket.Packet) {
	return func(port int, frame gopacket.Packet) {
	ipAddress := common.GetInterfaceIP(o.InternalIf)
	incoming := &ponsim.IncomingData{
	Id: "INGRESS.ONU." + ipAddress,
	Address: ipAddress,
	Port: int32(port),
	Payload: frame.Data(),
	}
	common.Logger().WithFields(logrus.Fields{
	"device": o,
	"port": port,
	"frame": frame,
	"frameDump": frame.Dump(),
	"incoming": incoming,
	}).Debug("Forwarding to OLT")

	// Forward packet to OLT
	if err := o.stream.Send(incoming); err != nil {
	common.Logger().WithFields(logrus.Fields{
	"device": o,
	"port": port,
	"frameDump": frame.Dump(),
	"incoming": incoming,
	}).Fatal("A problem occurred while forwarding to OLT")
	}
	}
	}

	/*
	forwardToWAN defines a EGRESS function to forward a packet to the world
	*/
	func (o *PonSimOnuDevice) forwardToWAN() func(int, gopacket.Packet) {
	return func(port int, frame gopacket.Packet) {
	var err error
	common.Logger().WithFields(logrus.Fields{
	"device": o,
	"port": port,
	"frame": frame,
	}).Debug("Forwarding packet to world")
	if err = o.ingressHandler.WritePacketData(frame.Data()); err != nil {
	common.Logger().WithFields(logrus.Fields{
	"device": o,
	"port": port,
	"frame": frame,
	}).Fatal("Problem while forwarding packet to world")
	} else {
	common.Logger().WithFields(logrus.Fields{
	"device": o,
	"port": port,
	"frame": frame,
	}).Debug("Forwarded packet to world")
	}
	}
	}

	/*
	Start performs setup operations for an ONU device
	*/
	func (o *PonSimOnuDevice) Start(ctx context.Context) {
	// Initialize the parent
	o.PonSimDevice.Start(ctx)

	// Setup flow behaviours
	// ONU -> OLT
	o.AddLink(1, 0, o.forwardToOLT())
	// ONU -> World
	o.AddLink(2, 0, o.forwardToWAN())

	go o.MonitorConnection(ctx)
	}

	/*
	Stop performs cleanup operations for an ONU device
	*/
	func (o *PonSimOnuDevice) Stop(ctx context.Context) {
	common.Logger().WithFields(logrus.Fields{
	"device": o,
	}).Debug("Stopping ONU")

	o.RemoveLink(1, 0)
	o.RemoveLink(2, 0)

	o.PonSimDevice.Stop(ctx)
	}

	/*
	Listen waits for incoming INGRESS data on the external interface
	*/
	func (o *PonSimOnuDevice) Listen(ctx context.Context) {
	var reply *empty.Empty
	var err error

	if o.oltClient = ponsim.NewPonSimCommonClient(o.Conn); o.oltClient == nil {
	common.Logger().WithFields(logrus.Fields{
	"device": o,
	}).Fatal("Problem establishing client connection to OLT")
	panic("Problem establishing client connection to OLT")
	}

	// Establish GRPC connection with OLT
	if o.stream, err = o.oltClient.ProcessData(ctx); err != nil {
	common.Logger().WithFields(logrus.Fields{
	"device": o,
	"error": err.Error(),
	}).Fatal("Problem establishing stream")
	panic(err)
	}

	defer o.ingressHandler.Close()
	packetSource := gopacket.NewPacketSource(o.ingressHandler, o.ingressHandler.LinkType())
	common.Logger().WithFields(logrus.Fields{
	"device": o,
	"interface": o.ExternalIf,
	}).Debug("Listening to incoming ONU data")

	for packet := range packetSource.Packets() {
	common.Logger().WithFields(logrus.Fields{
	"device": o,
	"packet": packet,
	}).Debug("Received INGRESS packet")

	o.Forward(ctx, 2, packet)
	}

	common.Logger().WithFields(logrus.Fields{
	"device": o,
	}).Debug("No more packets to process")

	if reply, err = o.stream.CloseAndRecv(); err != nil {
	common.Logger().Fatal("A problem occurred while closing Ingress stream", err.Error())
	} else {
	common.Logger().Info("Ingress stream closed", reply)
	}
	}

	/*
	Register sends a registration request to the remote OLT
	*/
	func (o *PonSimOnuDevice) Register(ctx context.Context) error {
	var err error
	var rreq *ponsim.RegistrationRequest
	var rrep *ponsim.RegistrationReply
	var client ponsim.PonSimOltClient

	if o.Conn != nil {
	if client = ponsim.NewPonSimOltClient(o.Conn); client != nil {
	rreq = &ponsim.RegistrationRequest{
	Id: uuid.New().String(),
	Address: common.GetInterfaceIP(o.InternalIf),
	Port: o.Port,
	}
	common.Logger().Printf("Request details %+v\n", rreq)

	// TODO: Loop registration until an OLT becomes available??

	rrep, err = client.Register(ctx, rreq)
	if err != nil {
	common.Logger().Printf("Problem with registration", err.Error())
	} else {
	// Save OLT address details
	o.ParentAddress = rrep.GetParentAddress()
	o.ParentPort = rrep.GetParentPort()
	o.AssignedPort = rrep.GetAssignedPort()

	common.Logger().Printf("Registration details - %+v\n", rrep)

	o.monitor <- REGISTERED_WITH_OLT
	}

	} else {
	common.Logger().Info("Client is NIL")
	}
	}

	return err
	}

	/*
	MonitorConnection verifies the communication with the OLT
	*/
	func (o *PonSimOnuDevice) MonitorConnection(ctx context.Context) {
	for {
	if o.state == DISCONNECTED_FROM_PON {
	// Establish communication with OLT
	o.Connect(ctx)
	}

	if o.state == CONNECTED_TO_PON {
	// Just stay idle while the ONU-OLT connection is up
	o.Conn.WaitForStateChange(ctx, o.Conn.GetState())

	// The ONU-OLT connection was lost... need to cleanup
	o.Disconnect(ctx)
	}

	time.Sleep(1 * time.Second)
	}
	}

	/*
	Connect sets up communication and monitoring with remote OLT
	*/
	func (o *PonSimOnuDevice) Connect(ctx context.Context) {
	o.monitor = make(chan PonSimDeviceState, 1)

	// Define a waitgroup to block the current routine until
	// a CONNECTED state is reached
	wg := sync.WaitGroup{}
	wg.Add(1)

	go o.MonitorState(ctx, &wg)

	o.ConnectToRemoteOlt()

	// Wait until we establish a connection to the remote PON
	wg.Wait()
	}

	/*
	Disconnect tears down communication and monitoring with remote OLT
	*/
	func (o *PonSimOnuDevice) Disconnect(ctx context.Context) {
	if o.egressHandler != nil {
	o.egressHandler.Close()
	o.egressHandler = nil
	}

	if o.Conn != nil {
	o.Conn.Close()
	o.Conn = nil
	}

	if o.monitor != nil {
	close(o.monitor)
	o.monitor = nil
	o.state = DISCONNECTED_FROM_PON
	}
	}

	/*
	MonitorState follows the progress of the OLT connection
	*/
	func (o PonSimOnuDevice) MonitorState(ctx context.Context, wg sync.WaitGroup) {
	// Start a concurrent routine to handle ONU state changes
	var ok bool
	for {
	select {
	case o.state, ok = <-o.monitor:
	if ok {
	common.Logger().WithFields(logrus.Fields{
	"device": o,
	"state": o.state,
	}).Info("Received monitoring state")

	switch o.state {
	case CONNECTED_TO_PON:
	// We have successfully connected to the OLT
	// proceed with registration
	wg.Done()

	if err := o.Register(ctx); err != nil {
	o.Disconnect(ctx)
	}

	case DISCONNECTED_FROM_PON:
	// Connection to remote OLT was lost... exit
	common.Logger().WithFields(logrus.Fields{
	"device": o,
	}).Warn("Exiting due to disconnection")
	return

	case REGISTERED_WITH_OLT:
	// Start listening on network interfaces
	o.connectNetworkInterfaces()
	o.monitor <- CONNECTED_IO_INTERFACE

	case CONNECTED_IO_INTERFACE:
	// Start listening on local interfaces
	go o.Listen(ctx)
	}
	} else {
	common.Logger().WithFields(logrus.Fields{
	"device": o,
	}).Warn("Monitoring channel has closed")
	return
	}
	case <-ctx.Done():
	common.Logger().WithFields(logrus.Fields{
	"device": o,
	}).Warn("Received a cancellation notification")

	return
	}
	}
	}

	/*
	ConnectToRemoteOlt establishes GRPC communication with the remote OLT
	*/
	func (o *PonSimOnuDevice) ConnectToRemoteOlt() {
	common.Logger().WithFields(logrus.Fields{
	"device": o,
	}).Debug("Connecting to remote device")

	var err error

	host := strings.Join([]string{
	o.ParentAddress,
	strconv.Itoa(int(o.ParentPort)),
	}, ":")

	// TODO: make it secure
	// GRPC communication needs to be secured
	ta := credentials.NewTLS(&tls.Config{
	//Certificates: []tls.Certificate{peerCert},
	//RootCAs: caCertPool,
	InsecureSkipVerify: true,
	})

	if o.Conn, err = grpc.DialContext(
	context.Background(), host, grpc.WithTransportCredentials(ta), grpc.WithBlock(),
	); err != nil {
	common.Logger().WithFields(logrus.Fields{
	"device": o,
	"error": err.Error(),
	}).Error("Problem establishing connection")
	} else {
	// We are now connected
	// time to move on
	common.Logger().WithFields(logrus.Fields{
	"device": o,
	}).Info("Connected to OLT")
	}

	o.monitor <- CONNECTED_TO_PON
	}