5434

Committed 14 Aug 2021 12:02AM UTC coverage: 57.804%. First build

Build # 5434

Build Type

Pull #853

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Pull Request Pull Request #853: Introduce new lock to safeguard concurrent hostagent code

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75.16

/pkg/hostagent/snats.go

// Copyright 2019 Cisco Systems, Inc.
//
// 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 WARRATIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Handlers for snat updates.

package hostagent

import (
        "bytes"
        "context"
        "encoding/json"
        "fmt"
        snatglobal "github.com/noironetworks/aci-containers/pkg/snatglobalinfo/apis/aci.snat/v1"
        snatglobalclset "github.com/noironetworks/aci-containers/pkg/snatglobalinfo/clientset/versioned"
        snatpolicy "github.com/noironetworks/aci-containers/pkg/snatpolicy/apis/aci.snat/v1"
        snatpolicyclset "github.com/noironetworks/aci-containers/pkg/snatpolicy/clientset/versioned"
        "github.com/noironetworks/aci-containers/pkg/util"
        "github.com/sirupsen/logrus"
        "io/ioutil"
        appsv1 "k8s.io/api/apps/v1"
        v1 "k8s.io/api/core/v1"
        "k8s.io/apimachinery/pkg/api/meta"
        metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
        "k8s.io/apimachinery/pkg/labels"
        "k8s.io/apimachinery/pkg/runtime"
        "k8s.io/apimachinery/pkg/watch"
        "k8s.io/client-go/tools/cache"
        "k8s.io/kubernetes/pkg/controller"
        "net"
        "os"
        "path/filepath"
        "reflect"
        "sort"
        "strings"
)

// Filename used to create external service file on host
// example snat-external.service
const SnatService = "snat-external"

type ResourceType int

const (
        POD ResourceType = 1 << iota
        SERVICE
        DEPLOYMENT
        NAMESPACE
        CLUSTER
        INVALID
)

type OpflexPortRange struct {
        Start int `json:"start,omitempty"`
        End   int `json:"end,omitempty"`
}

// This structure is to write the  SnatFile
type OpflexSnatIp struct {
        Uuid          string                   `json:"uuid"`
        InterfaceName string                   `json:"interface-name,omitempty"`
        SnatIp        string                   `json:"snat-ip,omitempty"`
        InterfaceMac  string                   `json:"interface-mac,omitempty"`
        Local         bool                     `json:"local,omitempty"`
        DestIpAddress []string                 `json:"dest,omitempty"`
        PortRange     []OpflexPortRange        `json:"port-range,omitempty"`
        InterfaceVlan uint                     `json:"interface-vlan,omitempty"`
        Zone          uint                     `json:"zone,omitempty"`
        Remote        []OpflexSnatIpRemoteInfo `json:"remote,omitempty"`
}

// This Structure is to calculate remote Info
type OpflexSnatIpRemoteInfo struct {
        NodeIp     string            `json:"snat_ip,omitempty"`
        MacAddress string            `json:"mac,omitempty"`
        PortRange  []OpflexPortRange `json:"port-range,omitempty"`
        Refcount   int               `json:"ref,omitempty"`
}

type opflexSnatGlobalInfo struct {
        SnatIp         string
        MacAddress     string
        PortRange      []OpflexPortRange
        SnatIpUid      string
        SnatPolicyName string
}

type opflexSnatLocalInfo struct {
        Snatpolicies map[ResourceType][]string //Each resource can represent multiple entries
        PlcyUuids    []string                  //sorted policy uuids
}

func (agent *HostAgent) initSnatGlobalInformerFromClient(
        snatClient *snatglobalclset.Clientset) {
        agent.initSnatGlobalInformerBase(
                &cache.ListWatch{
                        ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
                                return snatClient.AciV1().SnatGlobalInfos(metav1.NamespaceAll).List(context.TODO(), options)
                        },
                        WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
                                return snatClient.AciV1().SnatGlobalInfos(metav1.NamespaceAll).Watch(context.TODO(), options)
                        },
                })
}

func (agent *HostAgent) initSnatPolicyInformerFromClient(
        snatClient *snatpolicyclset.Clientset) {
        agent.initSnatPolicyInformerBase(
                &cache.ListWatch{
                        ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
                                return snatClient.AciV1().SnatPolicies().List(context.TODO(), options)
                        },
                        WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
                                return snatClient.AciV1().SnatPolicies().Watch(context.TODO(), options)
                        },
                })
}

func writeSnat(snatfile string, snat *OpflexSnatIp) (bool, error) {
        newdata, err := json.MarshalIndent(snat, "", "  ")
        if err != nil {
                return true, err
        }
        existingdata, err := ioutil.ReadFile(snatfile)
        if err == nil && reflect.DeepEqual(existingdata, newdata) {
                return false, nil
        }

        err = ioutil.WriteFile(snatfile, newdata, 0644)
        return true, err
}

func (agent *HostAgent) FormSnatFilePath(uuid string) string {
        return filepath.Join(agent.config.OpFlexSnatDir, uuid+".snat")
}

func SnatGlobalInfoLogger(log *logrus.Logger, snat *snatglobal.SnatGlobalInfo) *logrus.Entry {
        return log.WithFields(logrus.Fields{
                "namespace": snat.ObjectMeta.Namespace,
                "name":      snat.ObjectMeta.Name,
                "spec":      snat.Spec,
        })
}

func opflexSnatIpLogger(log *logrus.Logger, snatip *OpflexSnatIp) *logrus.Entry {
        return log.WithFields(logrus.Fields{
                "uuid":           snatip.Uuid,
                "snat_ip":        snatip.SnatIp,
                "mac_address":    snatip.InterfaceMac,
                "port_range":     snatip.PortRange,
                "local":          snatip.Local,
                "interface-name": snatip.InterfaceName,
                "interfcae-vlan": snatip.InterfaceVlan,
                "remote":         snatip.Remote,
        })
}

func (agent *HostAgent) initSnatGlobalInformerBase(listWatch *cache.ListWatch) {
        agent.snatGlobalInformer = cache.NewSharedIndexInformer(
                listWatch,
                &snatglobal.SnatGlobalInfo{},
                controller.NoResyncPeriodFunc(),
                cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc},
        )
        agent.snatGlobalInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
                AddFunc: func(obj interface{}) {
                        agent.snatGlobalInfoUpdate(obj)
                },
                UpdateFunc: func(_ interface{}, obj interface{}) {
                        agent.snatGlobalInfoUpdate(obj)
                },
                DeleteFunc: func(obj interface{}) {
                        agent.snatGlobalInfoDelete(obj)
                },
        })
        agent.log.Info("Initializing SnatGlobal Info Informers")
}

func (agent *HostAgent) initSnatPolicyInformerBase(listWatch *cache.ListWatch) {
        agent.snatPolicyInformer = cache.NewSharedIndexInformer(
                listWatch,
                &snatpolicy.SnatPolicy{}, controller.NoResyncPeriodFunc(),
                cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc},
        )
        agent.snatPolicyInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
                AddFunc: func(obj interface{}) {
                        agent.snatPolicyAdded(obj)
                },
                UpdateFunc: func(oldobj interface{}, newobj interface{}) {
                        agent.snatPolicyUpdated(oldobj, newobj)
                },
                DeleteFunc: func(obj interface{}) {
                        agent.snatPolicyDeleted(obj)
                },
        })
        agent.log.Infof("Initializing Snat Policy Informers")
}

func (agent *HostAgent) snatPolicyAdded(obj interface{}) {
        agent.indexMutex.Lock()
        defer agent.indexMutex.Unlock()
        policyinfo := obj.(*snatpolicy.SnatPolicy)
        agent.log.Info("Policy Info Added: ", policyinfo.ObjectMeta.Name)
        if policyinfo.Status.State != snatpolicy.Ready {
                return
        }
        agent.snatPolicyCache[policyinfo.ObjectMeta.Name] = policyinfo
        setDestIp(agent.snatPolicyCache[policyinfo.ObjectMeta.Name].Spec.DestIp)
        agent.handleSnatUpdate(policyinfo)
}

func (agent *HostAgent) snatPolicyUpdated(oldobj interface{}, newobj interface{}) {
        agent.indexMutex.Lock()
        defer agent.indexMutex.Unlock()
        oldpolicyinfo := oldobj.(*snatpolicy.SnatPolicy)
        newpolicyinfo := newobj.(*snatpolicy.SnatPolicy)
        agent.log.Info("Policy Info Updated: ", newpolicyinfo.ObjectMeta.Name)
        agent.log.Info("Policy Status: ", newpolicyinfo.Status.State)
        if reflect.DeepEqual(oldpolicyinfo, newpolicyinfo) {
                return
        }
        //1. check if the local nodename is  present in globalinfo
        // 2. if it is not present then delete the policy from localInfo as the portinfo is not allocated  for node
        if newpolicyinfo.Status.State == snatpolicy.IpPortsExhausted {
                agent.log.Info("Ports exhausted: ", newpolicyinfo.ObjectMeta.Name)
                ginfo, ok := agent.opflexSnatGlobalInfos[agent.config.NodeName]
                present := false
                if ok {
                        for _, v := range ginfo {
                                if v.SnatPolicyName == newpolicyinfo.ObjectMeta.Name {
                                        present = true
                                }
                        }
                }
                if !ok || !present {
                        agent.deletePolicy(newpolicyinfo)
                }
                return
        }
        if newpolicyinfo.Status.State != snatpolicy.Ready {
                return
        }
        agent.snatPolicyCache[newpolicyinfo.ObjectMeta.Name] = newpolicyinfo
        setDestIp(agent.snatPolicyCache[newpolicyinfo.ObjectMeta.Name].Spec.DestIp)
        // After Validation of SnatPolicy State will be set to Ready
        if newpolicyinfo.Status.State != oldpolicyinfo.Status.State {
                agent.handleSnatUpdate(newpolicyinfo)
                return
        }
        update := true
        if !reflect.DeepEqual(oldpolicyinfo.Spec.Selector,
                newpolicyinfo.Spec.Selector) {
                var poduids []string
                // delete all the pods matching the policy
                for uuid, res := range agent.snatPods[newpolicyinfo.ObjectMeta.Name] {
                        agent.deleteSnatLocalInfo(uuid, res, newpolicyinfo.ObjectMeta.Name)
                        poduids = append(poduids, uuid)
                }
                agent.updateEpFiles(poduids)
                agent.handleSnatUpdate(newpolicyinfo)
                var matchingpods []string
                for uuid := range agent.snatPods[newpolicyinfo.ObjectMeta.Name] {
                        matchingpods = append(matchingpods, uuid)
                }
                // Nodeinfo trigger handles if handlesnatUpdate don't match any pods
                // this trigger clears the globalinfo allocated for node
                if len(poduids) > 0 && len(matchingpods) == 0 {
                        agent.scheduleSyncNodeInfo()
                } else {
                        // Epfiles needs to be updated if there are any  pods matching with newlabel
                        agent.updateEpFiles(matchingpods)
                }
                update = false
        }
        // destination update can be ignored  if labels also changed
        if !reflect.DeepEqual(oldpolicyinfo.Spec.DestIp,
                newpolicyinfo.Spec.DestIp) && update {
                // updateEpFile
                // SyncSnatFile
                var poduids []string
                for uid := range agent.snatPods[newpolicyinfo.ObjectMeta.Name] {
                        poduids = append(poduids, uid)
                }
                // This EPfiles update based on destip chanes policy order is maintained
                agent.updateEpFiles(poduids)
                agent.scheduleSyncSnats()
        }

}

func (agent *HostAgent) snatPolicyDeleted(obj interface{}) {
        agent.indexMutex.Lock()
        defer agent.indexMutex.Unlock()
        policyinfo := obj.(*snatpolicy.SnatPolicy)
        agent.deletePolicy(policyinfo)
        delete(agent.snatPolicyCache, policyinfo.ObjectMeta.Name)
}

func (agent *HostAgent) handleSnatUpdate(policy *snatpolicy.SnatPolicy) {
        // First Parse the policy and check for applicability
        // list all the Pods based on labels and namespace
        agent.log.Debug("Handle snatUpdate: ", policy)
        _, err := cache.MetaNamespaceKeyFunc(policy)
        if err != nil {
                return
        }
        // 1.List the targets matching the policy based on policy config
        uids := make(map[ResourceType][]string)
        switch {
        case len(policy.Spec.SnatIp) == 0:
                //handle policy for service pods
                var services []*v1.Service
                var poduids []string
                selector := labels.SelectorFromSet(labels.Set(policy.Spec.Selector.Labels))
                cache.ListAll(agent.serviceInformer.GetIndexer(), selector,
                        func(servobj interface{}) {
                                services = append(services, servobj.(*v1.Service))
                        })
                // list the pods and apply the policy at service target
                for _, service := range services {
                        uids, _ := agent.getPodsMatchingObjet(service, policy.ObjectMeta.Name)
                        poduids = append(poduids, uids...)
                        key, err := cache.MetaNamespaceKeyFunc(service)
                        if err == nil {
                                _, ok := agent.ReadSnatPolicyLabel(key)
                                if ok && len(policy.Spec.Selector.Labels) > 0 {
                                        agent.WriteSnatPolicyLabel(key, policy.ObjectMeta.Name, SERVICE)
                                }
                        }
                }
                uids[SERVICE] = poduids
        case reflect.DeepEqual(policy.Spec.Selector, snatpolicy.PodSelector{}):
                // This Policy will be applied at cluster level
                var poduids []string
                // handle policy for cluster
                for k := range agent.opflexEps {
                        poduids = append(poduids, k)
                }
                uids[CLUSTER] = poduids
        case len(policy.Spec.Selector.Labels) == 0:
                // This is namespace based policy
                var poduids []string
                cache.ListAllByNamespace(agent.podInformer.GetIndexer(), policy.Spec.Selector.Namespace, labels.Everything(),
                        func(podobj interface{}) {
                                pod := podobj.(*v1.Pod)
                                if pod.Spec.NodeName == agent.config.NodeName {
                                        poduids = append(poduids, string(pod.ObjectMeta.UID))
                                }
                        })
                uids[NAMESPACE] = poduids
        default:
                poduids, deppoduids, nspoduids :=
                        agent.getPodUidsMatchingLabel(policy.Spec.Selector.Namespace, policy.Spec.Selector.Labels, policy.ObjectMeta.Name)
                uids[POD] = poduids
                uids[DEPLOYMENT] = deppoduids
                uids[NAMESPACE] = nspoduids
        }
        for res, poduids := range uids {
                agent.applyPolicy(poduids, res, policy.GetName())
        }
}

func (agent *HostAgent) updateSnatPolicyLabels(obj interface{}, policyname string) (poduids []string) {
        uids, res := agent.getPodsMatchingObjet(obj, policyname)
        if len(uids) > 0 {
                key, _ := cache.MetaNamespaceKeyFunc(obj)
                if _, ok := agent.ReadSnatPolicyLabel(key); ok {
                        agent.WriteSnatPolicyLabel(key, policyname, res)
                }
        }
        return uids
}

// Get all the pods matching the Policy Selector
func (agent *HostAgent) getPodUidsMatchingLabel(namespace string, label map[string]string, policyname string) (poduids []string,
        deppoduids []string, nspoduids []string) {
        selector := labels.SelectorFromSet(labels.Set(label))
        cache.ListAll(agent.podInformer.GetIndexer(), selector,
                func(podobj interface{}) {
                        pod := podobj.(*v1.Pod)
                        if pod.Spec.NodeName == agent.config.NodeName {
                                poduids = append(poduids, agent.updateSnatPolicyLabels(podobj, policyname)...)
                        }
                })
        cache.ListAll(agent.depInformer.GetIndexer(), selector,
                func(depobj interface{}) {
                        deppoduids = append(deppoduids, agent.updateSnatPolicyLabels(depobj, policyname)...)
                })
        cache.ListAll(agent.nsInformer.GetIndexer(), selector,
                func(nsobj interface{}) {
                        nspoduids = append(nspoduids, agent.updateSnatPolicyLabels(nsobj, policyname)...)
                })
        return
}

// Apply the Policy at Resource level
func (agent *HostAgent) applyPolicy(poduids []string, res ResourceType, snatPolicyName string) {
        nodeUpdate := false
        if len(poduids) == 0 {
                return
        }
        if _, ok := agent.snatPods[snatPolicyName]; !ok {
                agent.snatPods[snatPolicyName] = make(map[string]ResourceType)
                nodeUpdate = true
        }
        for _, uid := range poduids {
                _, ok := agent.opflexSnatLocalInfos[uid]
                if !ok {
                        var localinfo opflexSnatLocalInfo
                        localinfo.Snatpolicies = make(map[ResourceType][]string)
                        localinfo.Snatpolicies[res] = append(localinfo.Snatpolicies[res], snatPolicyName)
                        agent.opflexSnatLocalInfos[uid] = &localinfo
                        agent.snatPods[snatPolicyName][uid] |= res
                        agent.log.Debug("Apply policy res: ", agent.snatPods[snatPolicyName][uid])

                } else {
                        present := false
                        for _, name := range agent.opflexSnatLocalInfos[uid].Snatpolicies[res] {
                                if name == snatPolicyName {
                                        present = true
                                }
                        }
                        if present == false {
                                agent.opflexSnatLocalInfos[uid].Snatpolicies[res] =
                                        append(agent.opflexSnatLocalInfos[uid].Snatpolicies[res], snatPolicyName)
                                agent.snatPods[snatPolicyName][uid] |= res
                                agent.log.Debug("Apply policy res: ", agent.snatPods[snatPolicyName][uid])
                        }
                }
        }
        if nodeUpdate == true {
                agent.log.Debug("Schedule the node Sync")
                agent.scheduleSyncNodeInfo()
        } else {
                // trigger update  the epfile
                agent.updateEpFiles(poduids)
        }
        return
}

// Sync the NodeInfo
func (agent *HostAgent) syncSnatNodeInfo() bool {
        if !agent.syncEnabled {
                return false
        }
        snatPolicyNames := make(map[string]bool)
        agent.indexMutex.Lock()
        for key, val := range agent.snatPods {
                if len(val) > 0 {
                        snatPolicyNames[key] = true
                }
        }
        agent.indexMutex.Unlock()
        env := agent.env.(*K8sEnvironment)
        if env == nil {
                return false
        }
        // send nodeupdate for the policy names
        if agent.InformNodeInfo(env.nodeInfo, snatPolicyNames) == false {
                agent.log.Debug("Failed to update retry: ", snatPolicyNames)
                return true
        }
        agent.log.Debug("Updated Node Info: ", snatPolicyNames)
        return false
}

func (agent *HostAgent) deletePolicy(policy *snatpolicy.SnatPolicy) {
        pods, ok := agent.snatPods[policy.GetName()]
        var poduids []string
        if !ok {
                return
        }
        for uuid, res := range pods {
                agent.deleteSnatLocalInfo(uuid, res, policy.GetName())
                poduids = append(poduids, uuid)
        }
        agent.updateEpFiles(poduids)
        delete(agent.snatPods, policy.GetName())
        agent.log.Info("SnatPolicy deleted update Nodeinfo: ", policy.GetName())
        agent.scheduleSyncNodeInfo()
        agent.DeleteMatchingSnatPolicyLabel(policy.GetName())
        return
}

func (agent *HostAgent) deleteSnatLocalInfo(poduid string, res ResourceType, plcyname string) {
        localinfo, ok := agent.opflexSnatLocalInfos[poduid]
        if ok {
                i := uint(0)
                j := uint(0)
                // loop through all the resources matching the policy
                for i < uint(res) {
                        i = 1 << j
                        j = j + 1
                        if i&uint(res) == i {
                                length := len(localinfo.Snatpolicies[ResourceType(i)])
                                deletedcount := 0
                                for k := 0; k < length; k++ {
                                        l := k - deletedcount
                                        // delete the matching policy from  policy stack
                                        if plcyname == localinfo.Snatpolicies[ResourceType(i)][l] {
                                                agent.log.Info("Delete the Policy name: ", plcyname)
                                                localinfo.Snatpolicies[ResourceType(i)] =
                                                        append(localinfo.Snatpolicies[ResourceType(i)][:l],
                                                                localinfo.Snatpolicies[ResourceType(i)][l+1:]...)
                                                deletedcount++
                                        }
                                }
                                agent.log.Debug("Opflex agent and localinfo: ", agent.opflexSnatLocalInfos[poduid], localinfo)
                                if len(localinfo.Snatpolicies[res]) == 0 {
                                        delete(localinfo.Snatpolicies, res)
                                }
                                if v, ok := agent.snatPods[plcyname]; ok {
                                        if _, ok := v[poduid]; ok {
                                                agent.snatPods[plcyname][poduid] &= ^(res) // clear the bit
                                                agent.log.Debug("Res:  ", agent.snatPods[plcyname][poduid])
                                                if agent.snatPods[plcyname][poduid] == 0 { // delete the pod if no resource is pointing for the policy
                                                        delete(agent.snatPods[plcyname], poduid)
                                                        if len(agent.snatPods[plcyname]) == 0 {
                                                                delete(agent.snatPods, plcyname)
                                                        }
                                                }
                                        }
                                }
                        }
                }
        }
}

func (agent *HostAgent) snatGlobalInfoUpdate(obj interface{}) {
        agent.indexMutex.Lock()
        defer agent.indexMutex.Unlock()
        snat := obj.(*snatglobal.SnatGlobalInfo)
        key, err := cache.MetaNamespaceKeyFunc(snat)
        if err != nil {
                SnatGlobalInfoLogger(agent.log, snat).
                        Error("Could not create key:" + err.Error())
                return
        }
        agent.log.Info("Snat Global Object added/Updated: ", snat)
        agent.doUpdateSnatGlobalInfo(key)
}

func (agent *HostAgent) doUpdateSnatGlobalInfo(key string) {
        snatobj, exists, err :=
                agent.snatGlobalInformer.GetStore().GetByKey(key)
        if err != nil {
                agent.log.Error("Could not lookup snat for " +
                        key + ": " + err.Error())
                return
        }
        if !exists || snatobj == nil {
                return
        }
        snat := snatobj.(*snatglobal.SnatGlobalInfo)
        logger := SnatGlobalInfoLogger(agent.log, snat)
        agent.snaGlobalInfoChanged(snatobj, logger)
}

func fileExists(filename string) bool {
        info, err := os.Stat(filename)
        if os.IsNotExist(err) {
                return false
        }
        return !info.IsDir()
}

func (agent *HostAgent) snaGlobalInfoChanged(snatobj interface{}, logger *logrus.Entry) {
        snat := snatobj.(*snatglobal.SnatGlobalInfo)
        syncSnat := false
        updateLocalInfo := false
        if logger == nil {
                logger = agent.log.WithFields(logrus.Fields{})
        }
        logger.Debug("Snat Global info Changed...")
        globalInfo := snat.Spec.GlobalInfos
        // This case is possible when all the pods will be deleted from that node
        if len(globalInfo) < len(agent.opflexSnatGlobalInfos) {
                for nodename := range agent.opflexSnatGlobalInfos {
                        if _, ok := globalInfo[nodename]; !ok {
                                delete(agent.opflexSnatGlobalInfos, nodename)
                                syncSnat = true
                        }
                }
        }
        for nodename, val := range globalInfo {
                var newglobalinfos []*opflexSnatGlobalInfo
                for _, v := range val {
                        portrange := make([]OpflexPortRange, 1)
                        portrange[0].Start = v.PortRanges[0].Start
                        portrange[0].End = v.PortRanges[0].End
                        nodeInfo := &opflexSnatGlobalInfo{
                                SnatIp:         v.SnatIp,
                                MacAddress:     v.MacAddress,
                                PortRange:      portrange,
                                SnatIpUid:      v.SnatIpUid,
                                SnatPolicyName: v.SnatPolicyName,
                        }
                        newglobalinfos = append(newglobalinfos, nodeInfo)
                }
                existing, ok := agent.opflexSnatGlobalInfos[nodename]
                if (ok && !reflect.DeepEqual(existing, newglobalinfos)) || !ok {
                        agent.opflexSnatGlobalInfos[nodename] = newglobalinfos
                        if nodename == agent.config.NodeName {
                                updateLocalInfo = true
                        }
                        syncSnat = true
                }
        }

        snatFileName := SnatService + ".service"
        filePath := filepath.Join(agent.config.OpFlexServiceDir, snatFileName)
        file_exists := fileExists(filePath)
        if len(agent.opflexSnatGlobalInfos) > 0 {
                // if more than one global infos, create snat ext file
                as := &opflexService{
                        Uuid:              SnatService,
                        DomainPolicySpace: agent.config.AciVrfTenant,
                        DomainName:        agent.config.AciVrf,
                        ServiceMode:       "loadbalancer",
                        ServiceMappings:   make([]opflexServiceMapping, 0),
                        InterfaceName:     agent.config.UplinkIface,
                        InterfaceVlan:     uint16(agent.config.ServiceVlan),
                        ServiceMac:        agent.config.UplinkMacAdress,
                        InterfaceIp:       agent.serviceEp.Ipv4.String(),
                }
                sm := &opflexServiceMapping{
                        Conntrack: true,
                }
                as.ServiceMappings = append(as.ServiceMappings, *sm)
                agent.opflexServices[SnatService] = as
                if !file_exists {
                        wrote, err := writeAs(filePath, as)
                        if err != nil {
                                agent.log.Debug("Unable to write snat ext service file:")
                        } else if wrote {
                                agent.log.Debug("Created snat ext service file")
                        }

                }
        } else {
                delete(agent.opflexServices, SnatService)
                // delete snat service file if no global infos exist
                if file_exists {
                        err := os.Remove(filePath)
                        if err != nil {
                                agent.log.Debug("Unable to delete snat ext service file")
                        } else {
                                agent.log.Debug("Deleted snat ext service file")
                        }
                }
        }
        if syncSnat {
                agent.scheduleSyncSnats()
        }
        if updateLocalInfo {
                var poduids []string
                for _, v := range agent.opflexSnatGlobalInfos[agent.config.NodeName] {
                        for uuid := range agent.snatPods[v.SnatPolicyName] {
                                poduids = append(poduids, uuid)
                        }
                }
                agent.log.Info("Updating EpFile GlobalInfo Context: ", poduids)
                agent.updateEpFiles(poduids)
        }
}

func (agent *HostAgent) snatGlobalInfoDelete(obj interface{}) {
        agent.log.Debug("Snat Global Info Obj Delete")
        snat := obj.(*snatglobal.SnatGlobalInfo)
        globalInfo := snat.Spec.GlobalInfos
        agent.indexMutex.Lock()
        for nodename := range globalInfo {
                if _, ok := agent.opflexSnatGlobalInfos[nodename]; ok {
                        delete(agent.opflexSnatGlobalInfos, nodename)
                }
        }
        agent.indexMutex.Unlock()
}

func (agent *HostAgent) syncSnat() bool {
        if !agent.syncEnabled {
                return false
        }
        agent.log.Debug("Syncing snats")
        agent.indexMutex.Lock()
        opflexSnatIps := make(map[string]*OpflexSnatIp)
        remoteinfo := make(map[string][]OpflexSnatIpRemoteInfo)
        // set the remote info for every snatIp
        for nodename, v := range agent.opflexSnatGlobalInfos {
                for _, ginfo := range v {
                        if nodename != agent.config.NodeName {
                                var remote OpflexSnatIpRemoteInfo
                                remote.MacAddress = ginfo.MacAddress
                                remote.PortRange = ginfo.PortRange
                                remoteinfo[ginfo.SnatIp] = append(remoteinfo[ginfo.SnatIp], remote)
                        }
                }
        }
        agent.log.Debug("RemoteInfo: ", remoteinfo)
        // set the Opflex Snat IP information
        localportrange := make(map[string][]OpflexPortRange)
        ginfos, ok := agent.opflexSnatGlobalInfos[agent.config.NodeName]

        if ok {
                for _, ginfo := range ginfos {
                        localportrange[ginfo.SnatIp] = ginfo.PortRange
                }
        }

        for _, v := range agent.opflexSnatGlobalInfos {
                for _, ginfo := range v {
                        var snatinfo OpflexSnatIp
                        // set the local portrange
                        snatinfo.InterfaceName = agent.config.UplinkIface
                        snatinfo.InterfaceVlan = agent.config.ServiceVlan
                        snatinfo.InterfaceMac = agent.config.UplinkMacAdress
                        snatinfo.Local = false
                        if _, ok := localportrange[ginfo.SnatIp]; ok {
                                snatinfo.PortRange = localportrange[ginfo.SnatIp]
                                // need to sort the order
                                if _, ok := agent.snatPolicyCache[ginfo.SnatPolicyName]; ok {
                                        if len(agent.snatPolicyCache[ginfo.SnatPolicyName].Spec.DestIp) == 0 {
                                                snatinfo.DestIpAddress = []string{"0.0.0.0/0"}
                                        } else {
                                                snatinfo.DestIpAddress =
                                                        agent.snatPolicyCache[ginfo.SnatPolicyName].Spec.DestIp
                                        }
                                }
                                snatinfo.Local = true

                        }
                        snatinfo.SnatIp = ginfo.SnatIp
                        snatinfo.Uuid = ginfo.SnatIpUid
                        snatinfo.Zone = agent.config.Zone
                        snatinfo.Remote = remoteinfo[ginfo.SnatIp]
                        opflexSnatIps[ginfo.SnatIpUid] = &snatinfo
                        agent.log.Debug("Opflex Snat data IP: ", opflexSnatIps[ginfo.SnatIpUid])
                }
        }
        agent.indexMutex.Unlock()
        files, err := ioutil.ReadDir(agent.config.OpFlexSnatDir)
        if err != nil {
                agent.log.WithFields(
                        logrus.Fields{"SnatDir: ": agent.config.OpFlexSnatDir},
                ).Error("Could not read directory " + err.Error())
                return true
        }
        seen := make(map[string]bool)
        for _, f := range files {
                uuid := f.Name()
                if strings.HasSuffix(uuid, ".snat") {
                        uuid = uuid[:len(uuid)-5]
                } else {
                        continue
                }

                snatfile := filepath.Join(agent.config.OpFlexSnatDir, f.Name())
                logger := agent.log.WithFields(
                        logrus.Fields{"Uuid": uuid})
                existing, ok := opflexSnatIps[uuid]
                if ok {
                        fmt.Printf("snatfile:%s\n", snatfile)
                        wrote, err := writeSnat(snatfile, existing)
                        if err != nil {
                                opflexSnatIpLogger(agent.log, existing).Error("Error writing snat file: ", err)
                        } else if wrote {
                                opflexSnatIpLogger(agent.log, existing).Info("Updated snat")
                        }
                        seen[uuid] = true
                } else {
                        logger.Info("Removing snat")
                        os.Remove(snatfile)
                }
        }
        for _, snat := range opflexSnatIps {
                if seen[snat.Uuid] {
                        continue
                }
                opflexSnatIpLogger(agent.log, snat).Info("Adding Snat")
                snatfile :=
                        agent.FormSnatFilePath(snat.Uuid)
                _, err = writeSnat(snatfile, snat)
                if err != nil {
                        opflexSnatIpLogger(agent.log, snat).
                                Error("Error writing snat file: ", err)
                }
        }
        agent.log.Debug("Finished snat sync")
        return false
}

// Get the Pods matching the Object selector
func (agent *HostAgent) getPodsMatchingObjet(obj interface{}, policyname string) (poduids []string, res ResourceType) {
        metadata, err := meta.Accessor(obj)
        if err != nil {
                return
        }
        if agent.isPolicyNameSpaceMatches(policyname, metadata.GetNamespace()) == false {
                return
        }
        switch obj.(type) {
        case *v1.Pod:
                pod, _ := obj.(*v1.Pod)
                poduids = append(poduids, string(pod.ObjectMeta.UID))
                agent.log.Info("Matching pod uids: ", poduids)
        case *appsv1.Deployment:
                deployment, _ := obj.(*appsv1.Deployment)
                depkey, _ :=
                        cache.MetaNamespaceKeyFunc(deployment)
                for _, podkey := range agent.depPods.GetPodForObj(depkey) {
                        podobj, exists, err := agent.podInformer.GetStore().GetByKey(podkey)
                        if err != nil {
                                agent.log.Error("Could not lookup pod: ", err)
                                continue
                        }
                        if !exists || podobj == nil {
                                agent.log.Error("Object doesn't exist yet ", podkey)
                                continue
                        }
                        poduids = append(poduids, string(podobj.(*v1.Pod).ObjectMeta.UID))
                }
                agent.log.Info("Matching deployment pod uids: ", poduids)
                res = DEPLOYMENT
        case *v1.Service:
                service, _ := obj.(*v1.Service)
                selector := labels.SelectorFromSet(labels.Set(service.Spec.Selector))
                cache.ListAllByNamespace(agent.podInformer.GetIndexer(),
                        service.ObjectMeta.Namespace, selector,
                        func(podobj interface{}) {
                                pod := podobj.(*v1.Pod)
                                if pod.Spec.NodeName == agent.config.NodeName {
                                        poduids = append(poduids, string(pod.ObjectMeta.UID))
                                }
                        })
                agent.log.Info("Matcing service pod uids: ", poduids)
                res = SERVICE
        case *v1.Namespace:
                ns, _ := obj.(*v1.Namespace)
                cache.ListAllByNamespace(agent.podInformer.GetIndexer(),
                        ns.ObjectMeta.Name, labels.Everything(),
                        func(podobj interface{}) {
                                pod := podobj.(*v1.Pod)
                                if pod.Spec.NodeName == agent.config.NodeName {
                                        poduids = append(poduids, string(pod.ObjectMeta.UID))
                                }
                        })
                agent.log.Info("Matching namespace pod uids: ", poduids)
                res = NAMESPACE
        default:
        }
        return
}

// Updates the EPFile with Snatuuid's
func (agent *HostAgent) updateEpFiles(poduids []string) {
        syncEp := false
        for _, uid := range poduids {
                localinfo, ok := agent.opflexSnatLocalInfos[uid]
                if !ok {
                        continue
                }
                var i uint = 1
                var pos uint = 0
                var policystack []string
                // 1. loop through all the resource hierarchy
                // 2. Compute the Policy Stack
                for ; i <= uint(CLUSTER); i = 1 << pos {
                        pos = pos + 1
                        seen := make(map[string]bool)
                        policies, ok := localinfo.Snatpolicies[ResourceType(i)]
                        var sortedpolicies []string
                        if ok {
                                for _, name := range policies {
                                        if _, ok := seen[name]; !ok {
                                                seen[name] = true
                                                sortedpolicies = append(sortedpolicies, name)
                                        } else {
                                                continue
                                        }
                                }
                                sort.Slice(sortedpolicies,
                                        func(i, j int) bool {
                                                return agent.compare(sortedpolicies[i], sortedpolicies[j])
                                        })
                        }
                        policystack = append(policystack, sortedpolicies...)
                }
                var uids []string
                for _, name := range policystack {
                        for _, val := range agent.opflexSnatGlobalInfos[agent.config.NodeName] {
                                if val.SnatPolicyName == name {
                                        uids = append(uids, val.SnatIpUid)
                                }
                        }
                        if len(agent.snatPolicyCache[name].Spec.DestIp) == 0 {
                                break
                        }
                }
                if !reflect.DeepEqual(agent.opflexSnatLocalInfos[uid].PlcyUuids, uids) {
                        agent.log.Debug("Update EpFile: ", uids)
                        agent.opflexSnatLocalInfos[uid].PlcyUuids = uids
                        if len(uids) == 0 {
                                delete(agent.opflexSnatLocalInfos, uid)
                        }
                        syncEp = true
                }
        }
        if syncEp {
                agent.scheduleSyncEps()
        }
        agent.scheduleSyncLocalInfo()
}

func (agent *HostAgent) compare(plcy1, plcy2 string) bool {
        sort := false
        for _, a := range agent.snatPolicyCache[plcy1].Spec.DestIp {
                ip_temp := net.ParseIP(a)
                if ip_temp != nil && ip_temp.To4() != nil {
                        a = a + "/32"
                }
                for _, b := range agent.snatPolicyCache[plcy2].Spec.DestIp {
                        ip_temp := net.ParseIP(b)
                        if ip_temp != nil && ip_temp.To4() != nil {
                                b = b + "/32"
                        }
                        // TODO need to handle if the order is reversed across the policies.
                        // order reversing is ideally a wrong config. may be we need to block at verfication level
                        if compareIps(a, b) == true {
                                sort = true
                        }
                }
        }
        return sort
}

func (agent *HostAgent) getMatchingSnatPolicy(obj interface{}) (snatPolicyNames map[string][]ResourceType) {
        snatPolicyNames = make(map[string][]ResourceType)
        _, err := cache.MetaNamespaceKeyFunc(obj)
        if err != nil {
                return
        }
        metadata, err := meta.Accessor(obj)
        if err != nil {
                return
        }
        namespace := metadata.GetNamespace()
        label := metadata.GetLabels()
        res := getResourceType(obj)
        for _, item := range agent.snatPolicyCache {
                // check for empty policy selctor
                if reflect.DeepEqual(item.Spec.Selector, snatpolicy.PodSelector{}) {
                        snatPolicyNames[item.ObjectMeta.Name] =
                                append(snatPolicyNames[item.ObjectMeta.Name], CLUSTER)
                } else if len(item.Spec.Selector.Labels) == 0 &&
                        item.Spec.Selector.Namespace == namespace { // check policy matches namespace
                        if res == SERVICE {
                                if len(item.Spec.SnatIp) == 0 {
                                        snatPolicyNames[item.ObjectMeta.Name] =
                                                append(snatPolicyNames[item.ObjectMeta.Name], SERVICE)
                                }
                        } else {
                                if len(item.Spec.SnatIp) > 0 {
                                        snatPolicyNames[item.ObjectMeta.Name] =
                                                append(snatPolicyNames[item.ObjectMeta.Name], NAMESPACE)
                                }
                        }
                } else { //Check Policy matches the labels on the Object
                        if (item.Spec.Selector.Namespace != "" &&
                                item.Spec.Selector.Namespace == namespace) ||
                                (item.Spec.Selector.Namespace == "") {
                                if util.MatchLabels(item.Spec.Selector.Labels, label) {
                                        snatPolicyNames[item.ObjectMeta.Name] =
                                                append(snatPolicyNames[item.ObjectMeta.Name], res)
                                }
                                if res == POD {
                                        if len(item.Spec.SnatIp) == 0 {
                                                var services []*v1.Service
                                                cache.ListAllByNamespace(agent.serviceInformer.GetIndexer(), namespace, labels.Everything(),
                                                        func(servobj interface{}) {
                                                                services = append(services, servobj.(*v1.Service))
                                                        })
                                                // list the pods and apply the policy at service target
                                                for _, service := range services {
                                                        if util.MatchLabels(item.Spec.Selector.Labels,
                                                                service.ObjectMeta.Labels) {
                                                                snatPolicyNames[item.ObjectMeta.Name] =
                                                                        append(snatPolicyNames[item.ObjectMeta.Name], SERVICE)
                                                                break
                                                        }

                                                }
                                        } else {
                                                podKey, _ := cache.MetaNamespaceKeyFunc(obj)
                                                for _, dpkey := range agent.depPods.GetObjForPod(podKey) {
                                                        depobj, exists, err :=
                                                                agent.depInformer.GetStore().GetByKey(dpkey)
                                                        if err != nil {
                                                                agent.log.Error("Could not lookup snat for " +
                                                                        dpkey + ": " + err.Error())
                                                                continue
                                                        }
                                                        if !exists || depobj == nil {
                                                                continue
                                                        }
                                                        if util.MatchLabels(item.Spec.Selector.Labels,
                                                                depobj.(*appsv1.Deployment).ObjectMeta.Labels) {
                                                                snatPolicyNames[item.ObjectMeta.Name] =
                                                                        append(snatPolicyNames[item.ObjectMeta.Name], DEPLOYMENT)

                                                        }
                                                }
                                                nsobj, exists, err := agent.nsInformer.GetStore().GetByKey(namespace)
                                                if err != nil {
                                                        agent.log.Error("Could not lookup snat for " +
                                                                namespace + ": " + err.Error())
                                                        continue
                                                }
                                                if !exists || nsobj == nil {
                                                        continue
                                                }
                                                if util.MatchLabels(item.Spec.Selector.Labels,
                                                        nsobj.(*v1.Namespace).ObjectMeta.Labels) {
                                                        snatPolicyNames[item.ObjectMeta.Name] =
                                                                append(snatPolicyNames[item.ObjectMeta.Name], NAMESPACE)
                                                }
                                                // check for namespace match
                                        }
                                }
                        }
                }
        }
        return
}

func (agent *HostAgent) handleObjectUpdateForSnat(obj interface{}) {
        objKey, err := cache.MetaNamespaceKeyFunc(obj)
        if err != nil {
                return
        }
        plcynames, ok := agent.ReadSnatPolicyLabel(objKey)
        if !ok {
                agent.WriteNewSnatPolicyLabel(objKey)
        }
        sync := false
        if len(plcynames) == 0 {
                polcies := agent.getMatchingSnatPolicy(obj)
                for name, resources := range polcies {
                        for _, res := range resources {
                                poduids, _ := agent.getPodsMatchingObjet(obj, name)
                                if len(agent.snatPolicyCache[name].Spec.Selector.Labels) == 0 {
                                        agent.applyPolicy(poduids, res, name)
                                } else {
                                        agent.applyPolicy(poduids, res, name)
                                        agent.WriteSnatPolicyLabel(objKey, name, res)
                                }
                                if len(poduids) > 0 {
                                        sync = true
                                }
                        }
                }

        } else {
                var delpodlist []string
                matchnames := agent.getMatchingSnatPolicy(obj)
                agent.log.Info("HandleObject matching policies: ", matchnames)
                seen := make(map[string]bool)
                for name, res := range plcynames {
                        if _, ok := matchnames[name]; !ok {
                                poduids, _ := agent.getPodsMatchingObjet(obj, name)
                                for _, uid := range poduids {
                                        agent.deleteSnatLocalInfo(uid, res, name)
                                }
                                delpodlist = append(delpodlist, poduids...)
                                agent.DeleteSnatPolicyLabelEntry(objKey, name)
                        }
                        seen[name] = true
                }
                if len(delpodlist) > 0 {
                        agent.updateEpFiles(delpodlist)
                        sync = true
                }
                for name, resources := range matchnames {
                        if seen[name] == true {
                                continue
                        }
                        for _, res := range resources {
                                poduids, _ := agent.getPodsMatchingObjet(obj, name)
                                agent.applyPolicy(poduids, res, name)
                                agent.WriteSnatPolicyLabel(objKey, name, res)
                                sync = true
                        }
                }
        }
        if sync == true {
                agent.scheduleSyncNodeInfo()
        }
}

func (agent *HostAgent) handleObjectDeleteForSnat(obj interface{}) {
        objKey, err := cache.MetaNamespaceKeyFunc(obj)
        if err != nil {
                return
        }
        plcynames := agent.getMatchingSnatPolicy(obj)
        var podidlist []string
        sync := false
        for name, resources := range plcynames {
                agent.log.Infof("Handle snatpolicy as object deleted: %s,  ObjectKey: %s", name, objKey)
                poduids, _ := agent.getPodsMatchingObjet(obj, name)
                for _, uid := range poduids {
                        if getResourceType(obj) == SERVICE {
                                agent.log.Debug("Service deleted update the localInfo: ", name)
                                for _, res := range resources {
                                        agent.deleteSnatLocalInfo(uid, res, name)
                                }
                        } else {
                                delete(agent.opflexSnatLocalInfos, uid)
                                delete(agent.snatPods[name], uid)
                        }
                }
                podidlist = append(podidlist, poduids...)
                sync = true
        }
        agent.DeleteSnatPolicyLabel(objKey)
        // Delete any Policy entries present for POD
        if getResourceType(obj) == POD {
                uid := string(obj.(*v1.Pod).ObjectMeta.UID)
                localinfo, ok := agent.opflexSnatLocalInfos[uid]
                if ok {
                        for _, policynames := range localinfo.Snatpolicies {
                                for _, name := range policynames {
                                        delete(agent.snatPods[name], uid)
                                }
                        }
                        delete(agent.opflexSnatLocalInfos, uid)
                        sync = true
                }
        }
        if sync {
                agent.scheduleSyncNodeInfo()
                if getResourceType(obj) == SERVICE {
                        agent.updateEpFiles(podidlist)
                } else {
                        agent.scheduleSyncEps()
                        agent.scheduleSyncLocalInfo()
                }
        }
}

func (agent *HostAgent) isPolicyNameSpaceMatches(policyName string, namespace string) bool {
        policy, ok := agent.snatPolicyCache[policyName]
        if ok {
                if len(policy.Spec.Selector.Namespace) == 0 || (len(policy.Spec.Selector.Namespace) > 0 &&
                        policy.Spec.Selector.Namespace == namespace) {
                        return true
                }
        }
        return false
}

func (agent *HostAgent) getSnatUuids(poduuid string) []string {
        agent.indexMutex.Lock()
        val, check := agent.opflexSnatLocalInfos[poduuid]
        agent.indexMutex.Unlock()
        if check {
                return val.PlcyUuids

        } else {
                return []string{}
        }
}

func setDestIp(destIp []string) {
        if len(destIp) > 0 {
                sort.Slice(destIp, func(i, j int) bool {
                        a := destIp[i]
                        b := destIp[j]
                        ip_temp := net.ParseIP(a)
                        if ip_temp != nil && ip_temp.To4() != nil {
                                a = a + "/32"
                        }
                        ip_temp = net.ParseIP(b)
                        if ip_temp != nil && ip_temp.To4() != nil {
                                b = b + "/32"
                        }
                        return compareIps(a, b)
                })
        }
}

func compareIps(ipa string, ipb string) bool {
        ipB, ipnetB, _ := net.ParseCIDR(ipb)
        _, ipnetA, _ := net.ParseCIDR(ipa)
        if ipnetA.Contains(ipB) {
                // if the Ipa contains the Ipb
                //the above check can be true if example IP CIDR's are 10.10.0.0/16 10.10.0.0/24
                // if ip's are equal check the masks
                if ipnetA.IP.Equal(ipnetB.IP) {
                        if bytes.Compare(ipnetA.Mask, ipnetB.Mask) > 0 {
                                return true
                        }
                }
                return false
        }
        return true
}

func getResourceType(obj interface{}) ResourceType {
        var res ResourceType
        switch obj.(type) {
        case *v1.Pod:
                res = POD
        case *appsv1.Deployment:
                res = DEPLOYMENT
        case *v1.Service:
                res = SERVICE
        case *v1.Namespace:
                res = NAMESPACE
        default:
        }
        return res
}

noironetworks / aci-containers / 5434

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