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/*
* Copyright 2018-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 flowdecomposition
import (
"context"
"fmt"
"github.com/gogo/protobuf/proto"
"github.com/opencord/voltha-go/rw_core/coreif"
"github.com/opencord/voltha-go/rw_core/route"
fu "github.com/opencord/voltha-lib-go/v3/pkg/flows"
"github.com/opencord/voltha-lib-go/v3/pkg/log"
ofp "github.com/opencord/voltha-protos/v3/go/openflow_13"
"github.com/opencord/voltha-protos/v3/go/voltha"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// FlowDecomposer represent flow decomposer attribute
type FlowDecomposer struct {
deviceMgr coreif.DeviceManager
}
// NewFlowDecomposer creates flow decomposer instance
func NewFlowDecomposer(deviceMgr coreif.DeviceManager) *FlowDecomposer {
var decomposer FlowDecomposer
decomposer.deviceMgr = deviceMgr
return &decomposer
}
//DecomposeRules decomposes per-device flows and flow-groups from the flows and groups defined on a logical device
func (fd *FlowDecomposer) DecomposeRules(ctx context.Context, agent coreif.LogicalDeviceAgent, flows ofp.Flows, groups ofp.FlowGroups) (*fu.DeviceRules, error) {
deviceRules := *fu.NewDeviceRules()
devicesToUpdate := make(map[string]string)
groupMap := make(map[uint32]*ofp.OfpGroupEntry)
for _, groupEntry := range groups.Items {
groupMap[groupEntry.Desc.GroupId] = groupEntry
}
for _, flow := range flows.Items {
decomposedRules, err := fd.decomposeFlow(ctx, agent, flow, groupMap)
if err != nil {
return nil, err
}
for deviceID, flowAndGroups := range decomposedRules.Rules {
deviceRules.CreateEntryIfNotExist(deviceID)
deviceRules.Rules[deviceID].AddFrom(flowAndGroups)
devicesToUpdate[deviceID] = deviceID
}
}
return deviceRules.FilterRules(devicesToUpdate), nil
}
// Handles special case of any controller-bound flow for a parent device
func (fd *FlowDecomposer) updateOutputPortForControllerBoundFlowForParentDevide(flow *ofp.OfpFlowStats,
dr *fu.DeviceRules) (*fu.DeviceRules, error) {
EAPOL := fu.EthType(0x888e)
IGMP := fu.IpProto(2)
UDP := fu.IpProto(17)
newDeviceRules := dr.Copy()
// Check whether we are dealing with a parent device
for deviceID, fg := range dr.GetRules() {
if root, _ := fd.deviceMgr.IsRootDevice(deviceID); root {
newDeviceRules.ClearFlows(deviceID)
for i := 0; i < fg.Flows.Len(); i++ {
f := fg.GetFlow(i)
UpdateOutPortNo := false
for _, field := range fu.GetOfbFields(f) {
UpdateOutPortNo = (field.String() == EAPOL.String())
UpdateOutPortNo = UpdateOutPortNo || (field.String() == IGMP.String())
UpdateOutPortNo = UpdateOutPortNo || (field.String() == UDP.String())
if UpdateOutPortNo {
break
}
}
if UpdateOutPortNo {
f = fu.UpdateOutputPortByActionType(f, uint32(ofp.OfpInstructionType_OFPIT_APPLY_ACTIONS),
uint32(ofp.OfpPortNo_OFPP_CONTROLLER))
}
// Update flow Id as a change in the instruction field will result in a new flow ID
//var err error
//if f.Id, err = fu.HashFlowStats(f); err != nil {
//return nil, err
//}
newDeviceRules.AddFlow(deviceID, (proto.Clone(f)).(*ofp.OfpFlowStats))
}
}
}
return newDeviceRules, nil
}
//processControllerBoundFlow decomposes trap flows
func (fd *FlowDecomposer) processControllerBoundFlow(ctx context.Context, agent coreif.LogicalDeviceAgent, path []route.Hop,
inPortNo uint32, outPortNo uint32, flow *ofp.OfpFlowStats) (*fu.DeviceRules, error) {
logger.Debugw("trap-flow", log.Fields{"inPortNo": inPortNo, "outPortNo": outPortNo, "flow": flow})
deviceRules := fu.NewDeviceRules()
meterID := fu.GetMeterIdFromFlow(flow)
metadataFromwriteMetadata := fu.GetMetadataFromWriteMetadataAction(flow)
ingressHop := path[0]
egressHop := path[1]
//case of packet_in from NNI port rule
if agent.GetDeviceRoutes().IsRootPort(inPortNo) {
// Trap flow for NNI port
logger.Debug("trap-nni")
fa := &fu.FlowArgs{
KV: fu.OfpFlowModArgs{"priority": uint64(flow.Priority), "cookie": flow.Cookie},
MatchFields: []*ofp.OfpOxmOfbField{
fu.InPort(egressHop.Egress),
},
Actions: fu.GetActions(flow),
}
// Augment the matchfields with the ofpfields from the flow
fg := fu.NewFlowsAndGroups()
fa.MatchFields = append(fa.MatchFields, fu.GetOfbFields(flow, fu.IN_PORT)...)
fs, err := fu.MkFlowStat(fa)
if err != nil {
return nil, err
}
fg.AddFlow(fs)
deviceRules.AddFlowsAndGroup(egressHop.DeviceID, fg)
} else {
// Trap flow for UNI port
logger.Debug("trap-uni")
//inPortNo is 0 for wildcard input case, do not include upstream port for controller bound flow in input
var inPorts []uint32
if inPortNo == 0 {
inPorts = agent.GetWildcardInputPorts(egressHop.Egress) // exclude egress_hop.egress_port.port_no
} else {
inPorts = []uint32{inPortNo}
}
for _, inputPort := range inPorts {
// Upstream flow on parent (olt) device
faParent := &fu.FlowArgs{
KV: fu.OfpFlowModArgs{"priority": uint64(flow.Priority), "cookie": flow.Cookie, "meter_id": uint64(meterID), "write_metadata": metadataFromwriteMetadata},
MatchFields: []*ofp.OfpOxmOfbField{
fu.InPort(egressHop.Ingress),
fu.TunnelId(uint64(inputPort)),
},
Actions: []*ofp.OfpAction{
fu.Output(egressHop.Egress),
},
}
// Augment the matchfields with the ofpfields from the flow
faParent.MatchFields = append(faParent.MatchFields, fu.GetOfbFields(flow, fu.IN_PORT)...)
fgParent := fu.NewFlowsAndGroups()
fs, err := fu.MkFlowStat(faParent)
if err != nil {
return nil, err
}
fgParent.AddFlow(fs)
deviceRules.AddFlowsAndGroup(egressHop.DeviceID, fgParent)
logger.Debugw("parent-trap-flow-set", log.Fields{"flow": faParent})
// Upstream flow on child (onu) device
var actions []*ofp.OfpAction
setvid := fu.GetVlanVid(flow)
if setvid != nil {
// have this child push the vlan the parent is matching/trapping on above
actions = []*ofp.OfpAction{
fu.PushVlan(0x8100),
fu.SetField(fu.VlanVid(*setvid)),
fu.Output(ingressHop.Egress),
}
} else {
// otherwise just set the egress port
actions = []*ofp.OfpAction{
fu.Output(ingressHop.Egress),
}
}
faChild := &fu.FlowArgs{
KV: fu.OfpFlowModArgs{"priority": uint64(flow.Priority), "cookie": flow.Cookie, "meter_id": uint64(meterID), "write_metadata": metadataFromwriteMetadata},
MatchFields: []*ofp.OfpOxmOfbField{
fu.InPort(ingressHop.Ingress),
fu.TunnelId(uint64(inputPort)),
},
Actions: actions,
}
// Augment the matchfields with the ofpfields from the flow.
// If the parent has a match vid and the child is setting that match vid exclude the the match vlan
// for the child given it will be setting that vlan and the parent will be matching on it
if setvid != nil {
faChild.MatchFields = append(faChild.MatchFields, fu.GetOfbFields(flow, fu.IN_PORT, fu.VLAN_VID)...)
} else {
faChild.MatchFields = append(faChild.MatchFields, fu.GetOfbFields(flow, fu.IN_PORT)...)
}
fgChild := fu.NewFlowsAndGroups()
fs, err = fu.MkFlowStat(faChild)
if err != nil {
return nil, err
}
fgChild.AddFlow(fs)
deviceRules.AddFlowsAndGroup(ingressHop.DeviceID, fgChild)
logger.Debugw("child-trap-flow-set", log.Fields{"flow": faChild})
}
}
return deviceRules, nil
}
// processUpstreamNonControllerBoundFlow processes non-controller bound flow. We assume that anything that is
// upstream needs to get Q-in-Q treatment and that this is expressed via two flow rules, the first using the
// goto-statement. We also assume that the inner tag is applied at the ONU, while the outer tag is
// applied at the OLT
func (fd *FlowDecomposer) processUpstreamNonControllerBoundFlow(ctx context.Context,
path []route.Hop, inPortNo uint32, outPortNo uint32, flow *ofp.OfpFlowStats) (*fu.DeviceRules, error) {
logger.Debugw("upstream-non-controller-bound-flow", log.Fields{"inPortNo": inPortNo, "outPortNo": outPortNo})
deviceRules := fu.NewDeviceRules()
meterID := fu.GetMeterIdFromFlow(flow)
metadataFromwriteMetadata := fu.GetMetadataFromWriteMetadataAction(flow)
ingressHop := path[0]
egressHop := path[1]
if flow.TableId == 0 && fu.HasNextTable(flow) {
logger.Debugw("decomposing-onu-flow-in-upstream-has-next-table", log.Fields{"table_id": flow.TableId})
if outPortNo != 0 {
logger.Warnw("outPort-should-not-be-specified", log.Fields{"outPortNo": outPortNo})
return deviceRules, nil
}
fa := &fu.FlowArgs{
KV: fu.OfpFlowModArgs{"priority": uint64(flow.Priority), "cookie": flow.Cookie, "meter_id": uint64(meterID), "write_metadata": metadataFromwriteMetadata},
MatchFields: []*ofp.OfpOxmOfbField{
fu.InPort(ingressHop.Ingress),
fu.TunnelId(uint64(inPortNo)),
},
Actions: fu.GetActions(flow),
}
// Augment the matchfields with the ofpfields from the flow
fa.MatchFields = append(fa.MatchFields, fu.GetOfbFields(flow, fu.IN_PORT)...)
// Augment the Actions
fa.Actions = append(fa.Actions, fu.Output(ingressHop.Egress))
fg := fu.NewFlowsAndGroups()
fs, err := fu.MkFlowStat(fa)
if err != nil {
return nil, err
}
fg.AddFlow(fs)
deviceRules.AddFlowsAndGroup(ingressHop.DeviceID, fg)
} else if flow.TableId == 1 && outPortNo != 0 {
logger.Debugw("decomposing-olt-flow-in-upstream-has-next-table", log.Fields{"table_id": flow.TableId})
fa := &fu.FlowArgs{
KV: fu.OfpFlowModArgs{"priority": uint64(flow.Priority), "cookie": flow.Cookie, "meter_id": uint64(meterID), "write_metadata": metadataFromwriteMetadata},
MatchFields: []*ofp.OfpOxmOfbField{
fu.InPort(egressHop.Ingress),
fu.TunnelId(uint64(inPortNo)),
},
}
// Augment the matchfields with the ofpfields from the flow
fa.MatchFields = append(fa.MatchFields, fu.GetOfbFields(flow, fu.IN_PORT)...)
//Augment the actions
filteredAction := fu.GetActions(flow, fu.OUTPUT)
filteredAction = append(filteredAction, fu.Output(egressHop.Egress))
fa.Actions = filteredAction
fg := fu.NewFlowsAndGroups()
fs, err := fu.MkFlowStat(fa)
if err != nil {
return nil, err
}
fg.AddFlow(fs)
deviceRules.AddFlowsAndGroup(egressHop.DeviceID, fg)
}
return deviceRules, nil
}
// processDownstreamFlowWithNextTable decomposes downstream flows containing next table ID instructions
func (fd *FlowDecomposer) processDownstreamFlowWithNextTable(ctx context.Context, agent coreif.LogicalDeviceAgent, path []route.Hop,
inPortNo uint32, outPortNo uint32, flow *ofp.OfpFlowStats) (*fu.DeviceRules, error) {
logger.Debugw("decomposing-olt-flow-in-downstream-flow-with-next-table", log.Fields{"inPortNo": inPortNo, "outPortNo": outPortNo})
deviceRules := fu.NewDeviceRules()
meterID := fu.GetMeterIdFromFlow(flow)
metadataFromwriteMetadata := fu.GetMetadataFromWriteMetadataAction(flow)
if outPortNo != 0 {
logger.Warnw("outPort-should-not-be-specified", log.Fields{"outPortNo": outPortNo})
return deviceRules, nil
}
if flow.TableId != 0 {
logger.Warnw("This is not olt pipeline table, so skipping", log.Fields{"tableId": flow.TableId})
return deviceRules, nil
}
ingressHop := path[0]
egressHop := path[1]
if metadataFromwriteMetadata != 0 {
logger.Debugw("creating-metadata-flow", log.Fields{"flow": flow})
portNumber := fu.GetEgressPortNumberFromWriteMetadata(flow)
if portNumber != 0 {
recalculatedRoute, err := agent.GetRoute(ctx, inPortNo, portNumber)
if err != nil {
logger.Errorw("no-route-double-tag", log.Fields{"inPortNo": inPortNo, "outPortNo": outPortNo, "metadata": metadataFromwriteMetadata, "error": err})
return deviceRules, nil
}
switch len(recalculatedRoute) {
case 0:
logger.Errorw("no-route-double-tag", log.Fields{"inPortNo": inPortNo, "outPortNo": portNumber, "comment": "deleting-flow", "metadata": metadataFromwriteMetadata})
//TODO: Delete flow
return deviceRules, nil
case 2:
logger.Debugw("route-found", log.Fields{"ingressHop": ingressHop, "egressHop": egressHop})
default:
logger.Errorw("invalid-route-length", log.Fields{"routeLen": len(path)})
return deviceRules, nil
}
ingressHop = recalculatedRoute[0]
}
innerTag := fu.GetInnerTagFromMetaData(flow)
if innerTag == 0 {
logger.Errorw("no-inner-route-double-tag", log.Fields{"inPortNo": inPortNo, "outPortNo": portNumber, "comment": "deleting-flow", "metadata": metadataFromwriteMetadata})
//TODO: Delete flow
return deviceRules, nil
}
fa := &fu.FlowArgs{
KV: fu.OfpFlowModArgs{"priority": uint64(flow.Priority), "cookie": flow.Cookie, "meter_id": uint64(meterID), "write_metadata": metadataFromwriteMetadata},
MatchFields: []*ofp.OfpOxmOfbField{
fu.InPort(ingressHop.Ingress),
fu.Metadata_ofp(uint64(innerTag)),
fu.TunnelId(uint64(portNumber)),
},
Actions: fu.GetActions(flow),
}
// Augment the matchfields with the ofpfields from the flow
fa.MatchFields = append(fa.MatchFields, fu.GetOfbFields(flow, fu.IN_PORT, fu.METADATA)...)
// Augment the Actions
fa.Actions = append(fa.Actions, fu.Output(ingressHop.Egress))
fg := fu.NewFlowsAndGroups()
fs, err := fu.MkFlowStat(fa)
if err != nil {
return nil, err
}
fg.AddFlow(fs)
deviceRules.AddFlowsAndGroup(ingressHop.DeviceID, fg)
} else { // Create standard flow
logger.Debugw("creating-standard-flow", log.Fields{"flow": flow})
fa := &fu.FlowArgs{
KV: fu.OfpFlowModArgs{"priority": uint64(flow.Priority), "cookie": flow.Cookie, "meter_id": uint64(meterID), "write_metadata": metadataFromwriteMetadata},
MatchFields: []*ofp.OfpOxmOfbField{
fu.InPort(ingressHop.Ingress),
fu.TunnelId(uint64(inPortNo)),
},
Actions: fu.GetActions(flow),
}
// Augment the matchfields with the ofpfields from the flow
fa.MatchFields = append(fa.MatchFields, fu.GetOfbFields(flow, fu.IN_PORT)...)
// Augment the Actions
fa.Actions = append(fa.Actions, fu.Output(ingressHop.Egress))
fg := fu.NewFlowsAndGroups()
fs, err := fu.MkFlowStat(fa)
if err != nil {
return nil, err
}
fg.AddFlow(fs)
deviceRules.AddFlowsAndGroup(ingressHop.DeviceID, fg)
}
return deviceRules, nil
}
// processUnicastFlow decomposes unicast flows
func (fd *FlowDecomposer) processUnicastFlow(ctx context.Context, path []route.Hop,
inPortNo uint32, outPortNo uint32, flow *ofp.OfpFlowStats) (*fu.DeviceRules, error) {
logger.Debugw("decomposing-onu-flow-in-downstream-unicast-flow", log.Fields{"inPortNo": inPortNo, "outPortNo": outPortNo})
deviceRules := fu.NewDeviceRules()
egressHop := path[1]
meterID := fu.GetMeterIdFromFlow(flow)
metadataFromwriteMetadata := fu.GetMetadataFromWriteMetadataAction(flow)
fa := &fu.FlowArgs{
KV: fu.OfpFlowModArgs{"priority": uint64(flow.Priority), "cookie": flow.Cookie, "meter_id": uint64(meterID), "write_metadata": metadataFromwriteMetadata},
MatchFields: []*ofp.OfpOxmOfbField{
fu.InPort(egressHop.Ingress),
},
}
// Augment the matchfields with the ofpfields from the flow
fa.MatchFields = append(fa.MatchFields, fu.GetOfbFields(flow, fu.IN_PORT)...)
// Augment the Actions
filteredAction := fu.GetActions(flow, fu.OUTPUT)
filteredAction = append(filteredAction, fu.Output(egressHop.Egress))
fa.Actions = filteredAction
fg := fu.NewFlowsAndGroups()
fs, err := fu.MkFlowStat(fa)
if err != nil {
return nil, err
}
fg.AddFlow(fs)
deviceRules.AddFlowsAndGroup(egressHop.DeviceID, fg)
return deviceRules, nil
}
// processMulticastFlow decompose multicast flows
func (fd *FlowDecomposer) processMulticastFlow(ctx context.Context, path []route.Hop,
inPortNo uint32, outPortNo uint32, flow *ofp.OfpFlowStats, grpID uint32,
groupMap map[uint32]*ofp.OfpGroupEntry) *fu.DeviceRules {
logger.Debugw("multicast-flow", log.Fields{"inPortNo": inPortNo, "outPortNo": outPortNo})
deviceRules := fu.NewDeviceRules()
//having no Group yet is the same as having a Group with no buckets
var grp *ofp.OfpGroupEntry
var ok bool
if grp, ok = groupMap[grpID]; !ok {
logger.Warnw("Group-id-not-present-in-map", log.Fields{"grpId": grpID, "groupMap": groupMap})
return deviceRules
}
if grp == nil || grp.Desc == nil {
logger.Warnw("Group-or-desc-nil", log.Fields{"grpId": grpID, "grp": grp})
return deviceRules
}
deviceRules.CreateEntryIfNotExist(path[0].DeviceID)
fg := fu.NewFlowsAndGroups()
fg.AddFlow(flow)
//return the multicast flow without decomposing it
deviceRules.AddFlowsAndGroup(path[0].DeviceID, fg)
return deviceRules
}
// decomposeFlow decomposes a flow for a logical device into flows for each physical device
func (fd *FlowDecomposer) decomposeFlow(ctx context.Context, agent coreif.LogicalDeviceAgent, flow *ofp.OfpFlowStats,
groupMap map[uint32]*ofp.OfpGroupEntry) (*fu.DeviceRules, error) {
inPortNo := fu.GetInPort(flow)
if fu.HasGroup(flow) && inPortNo == 0 {
//if no in-port specified for a multicast flow, put NNI port as in-port
//so that a valid path can be found for the flow
nniPorts := agent.GetNNIPorts()
if len(nniPorts) > 0 {
inPortNo = nniPorts[0]
logger.Debugw("assigning-nni-port-as-in-port-for-multicast-flow", log.Fields{"nni": nniPorts[0], "flow:": flow})
}
}
outPortNo := fu.GetOutPort(flow)
deviceRules := fu.NewDeviceRules()
path, err := agent.GetRoute(ctx, inPortNo, outPortNo)
if err != nil {
return deviceRules, err
}
switch len(path) {
case 0:
return deviceRules, fmt.Errorf("no route from:%d to:%d :%w", inPortNo, outPortNo, route.ErrNoRoute)
case 2:
logger.Debugw("route-found", log.Fields{"ingressHop": path[0], "egressHop": path[1]})
default:
return deviceRules, fmt.Errorf("invalid route length %d :%w", len(path), route.ErrNoRoute)
}
// Process controller bound flow
if outPortNo != 0 && (outPortNo&0x7fffffff) == uint32(ofp.OfpPortNo_OFPP_CONTROLLER) {
deviceRules, err = fd.processControllerBoundFlow(ctx, agent, path, inPortNo, outPortNo, flow)
if err != nil {
return nil, err
}
} else {
var ingressDevice *voltha.Device
var err error
if ingressDevice, err = fd.deviceMgr.GetDevice(ctx, &voltha.ID{Id: path[0].DeviceID}); err != nil {
// This can happen in a race condition where a device is deleted right after we obtain a
// route involving the device (GetRoute() above). Handle it as a no route event as well.
return deviceRules, fmt.Errorf("get-device-error :%v :%w", err, route.ErrNoRoute)
}
isUpstream := !ingressDevice.Root
if isUpstream { // Unicast OLT and ONU UL
logger.Debug("process-olt-nd-onu-upstream-noncontrollerbound-unicast-flows", log.Fields{"flows": flow})
deviceRules, err = fd.processUpstreamNonControllerBoundFlow(ctx, path, inPortNo, outPortNo, flow)
if err != nil {
return nil, err
}
} else if fu.HasNextTable(flow) && flow.TableId == 0 { // Unicast OLT flow DL
logger.Debugw("process-olt-downstream-noncontrollerbound-flow-with-nexttable", log.Fields{"flows": flow})
deviceRules, err = fd.processDownstreamFlowWithNextTable(ctx, agent, path, inPortNo, outPortNo, flow)
if err != nil {
return nil, err
}
} else if flow.TableId == 1 && outPortNo != 0 { // Unicast ONU flow DL
logger.Debugw("process-onu-downstream-unicast-flow", log.Fields{"flows": flow})
deviceRules, err = fd.processUnicastFlow(ctx, path, inPortNo, outPortNo, flow)
if err != nil {
return nil, err
}
} else if grpID := fu.GetGroup(flow); grpID != 0 && flow.TableId == 0 { //Multicast
logger.Debugw("process-multicast-flow", log.Fields{"flows": flow})
deviceRules = fd.processMulticastFlow(ctx, path, inPortNo, outPortNo, flow, grpID, groupMap)
} else {
return deviceRules, status.Errorf(codes.Aborted, "unknown downstream flow %v", *flow)
}
}
deviceRules, err = fd.updateOutputPortForControllerBoundFlowForParentDevide(flow, deviceRules)
return deviceRules, err
}