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Sdewan config agent is the controller of Sdewan CRDs. With the config agent, we are able to deploy CNFs. In this page, we have the following terms, let's define them here.

...

Table of Contents

Goal

Sdewan CRD Controller (config agent) is the controller of Sdewan CRDs. With the CRD Controller, we are able to deploy Sdewan CRs to configure CNF rules. In this page, we have the following terms, let's define them here.

  • CNF Deployment: A deployment running network function process(openWRT)
  • Sdewan rule: The rule defines the CNF behaves. We have 3 classes of rules: mwan3, firewall, ipsec. Each class includes several kinds of rules. For example, mwan3 has 2 kinds: mwan3_policy and mwan3_rule. Firewall has 5 kinds: firewall_zone, firewall_snat, firewall_dnat, firewall_forwarding, firewall_rule. Ipsec has xx(ruoyu) kinds: xx, xx.
  • Sdewan rule CRD: The CRD defines each kind of sdewan rule. For each kind of Sdewan rule, we have a Sdewan rule CRD. Sdewan rule CRD is namespaced resource.
  • Sdewan rule CR: Instance of Sdewan rule CRD.
  • Sdewan controller: The controller watching Sdewan rule CRs.
  • CNF: A network function running in container.

To deploy a CNF, user needs to create one CNF deployment and some Sdewan rule CRs. In a Kubernetes namespace, there could be more than one CNF deployment and many Sdewan rule CRs. We use label to correlate one CNF with some Sdewan rule CRs. The Sdewan controller watches Sdewan rule CRs and applies them onto the correlated CNF by calling CNF REST api.

Sdwan Design Principle

  • There could be multiple tenants/namespaces in a Kubernetes cluster. User may deploy multiple CNFs in any one or more tenants.
  • The replica of CNF deployment could be more than one for active/backup purpose. We should apply rules for all the pods under CNF deployment. (This release doesn't implement VRRP between pods)
  • CNF deployment and Sdewan rule CRs can be created/updated/deleted in any order
  • The Sdewan controller and CNF process could be crash/restart at anytime for some reasons. We need to handle these scenarios
  • Each Sdewan rule CR has labels to identify the type it belongs to. 3 types are available at this time: basic, app-intent and k8s-service. We extend k8s user role permission so that we can set user permission at type level of Sdewan rule CR
  • Sdewan rule CR dependencies are checked on creating/updating/deleting. For example, if we create a mwan3_rule CR which uses policy policy-x, but no mwan3_policy CR named policy-x exists. Then we block the request

Architecture

CNF Deployment

In this section we describe what the CNF deployment should be like, as well as the pod under the deployment.

  • CNF pod should has multiple network interfaces attached. We use multus and ovn4nfv CNIs to enable multiple interfaces. So in the CNF pod yaml, we set annotations: k8s.v1.cni.cncf.io/networks, k8s.plugin.opnfv.org/nfn-network.
  • When user deploys a CNF, she/he most likely want to deploy the CNF on a specified node instead of a random node. Because some nodes may don't have provider network connected. So we set spec.nodeSelector for pod
  • CNF pod runs Sdewan CNF (based on openWRT in ICN). We use image integratedcloudnative/openwrt:dev
  • CNF pod should setup with rediness probe. Sdewan controller would check pod readiness before calling CNF REST api.

...

languageyml
titleCNF pod

...

Image Added

SDEWAN CRD Controller internally calls SDEWAN Restful API to do CNF configuration. And a remote client (e.g. SDEWAN Overlay Controller) can manage SDEWAN CNF configuration through creating/updating/deleting SDEWAN CRs. It includes below components:

  • MWAN3 Controller: monitor mwan3 related CR change then do mwan3 configuration in SDEWAN CNF
  • Firewall Controller: monitor firewall related CR change then do firewall configuration in SDEWAN CNF
  • IpSec Controller: monitor ipsec related CR change then do ipsec configuration in SDEWAN CNF
  • Service/Application Controller: configure firewall/NAT rule for in-cluster service and application
  • Runtime controller: collect runtime information of CNF include IPSec, IKE, firewall/NAT connections, DHCP leases,  DNS entries, ARP entries etc..
  • BucketPerssion/LabelValidateWebhook: do sdewan CR request permission check based on CR label and user

CNF Deployment

In this section we describe what the CNF deployment should be like, as well as the pod under the deployment.

  • CNF pod should has multiple network interfaces attached. We use multus and ovn4nfv CNIs to enable multiple interfaces. So in the CNF pod yaml, we set annotations: k8s.v1.cni.cncf.io/networks, k8s.plugin.opnfv.org/nfn-network.
  • When user deploys a CNF, she/he most likely want to deploy the CNF on a specified node instead of a random node. Because some nodes may don't have provider network connected. So we set spec.nodeSelector for pod
  • CNF pod runs Sdewan CNF (based on openWRT in ICN). We use image integratedcloudnative/openwrt:dev
  • CNF pod should setup with rediness probe. Sdewan controller would check pod readiness before calling CNF REST api.
Code Block
languageyml
titleCNF pod
apiVersion: extensions/v1beta1
kind: Deployment
metadata: 
  name: cnf-1
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:
  replicas: 1
  strategy:
    rollingUpdate:
      maxSurge: 25%
      maxUnavailable: 25%
    type: RollingUpdate
  template:
    metadata:
      annotations:
        k8s.plugin.opnfv.org/nfn-network: |-
          { "type": "ovn4nfv", "interface": [
            {
              "defaultGateway": "false",
              "interface": "net0",
              "name": "ovn-priv-net"
            },
            {
              "defaultGateway": "false",
              "interface": "net1",
              "name": "ovn-provider-net1"
            },
            {
              "defaultGateway": "false",
              "interface": "net2",
              "name": "ovn-provider-net2"
            }
          ]}
        k8s.v1.cni.cncf.io/networks: '[{ "name": "ovn-networkobj"}]'
    spec:
      containers:
      - command:
        - /bin/sh
        - /tmp/sdewan/entrypoint.sh
        image: integratedcloudnative/openwrt:dev
        name: sdewan
        readinessProbe:
          failureThreshold: 5
          httpGet:
            path: /
            port: 80
            scheme: HTTP
          initialDelaySeconds: 5
          periodSeconds: 5
          successThreshold: 1
          timeoutSeconds: 1
        securityContext:
          privileged: true
          procMount: Default
        volumeMounts:
        - mountPath: /tmp/sdewan
          name: example-sdewan
          readOnly: true
      nodeSelector:
        kubernetes.io/hostname: ubuntu18


Sdewan rule CRs

CRD defines all properties of a resource, but it's not human friendly. So we paste Sdewan rule CR samples instead of CRDs.

  • Each Sdewan rule CR has a label named sdewanPurpose to indicate which CNF should the rule be applied onto
  • Each Sdewan rule CR has the status field which indicates if the latest rule is applied and when it's applied
  • Mwan3Policy.spec.members[].network should match the networks defined in CNF pod annotation k8s.plugin.opnfv.org/nfn-network. As well as FirewallZone.spec[].network

...

  • Mwan3Policy.spec.members[].network should match the networks defined in CNF pod annotation k8s.plugin.opnfv.org/nfn-network. As well as FirewallZone.spec[].network

CR samples of Mwan3 type:

Code Block
languageyml
titleMwan3Policy CR
apiVersion: batch.sdewan.akraino.org/v1alpha1
kind: Mwan3Policy
metadata:
  name: balance1
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:  
  members:
    - network: ovn-net1
      weight: 2
      metric: 2
    - network: ovn-net2
      weight: 3
      metric: 3
status:
  appliedVersion: "2"
  appliedTime: "2020-03-29T04:21:48Z"
  inSync: True


Code Block
languageyml
titleMwan3Policy Mwan3Rule CR
apiVersion: batch.sdewan.akraino.org/v1alpha1
kind: Mwan3PolicyMwan3Rule
metadata:
  name: balance1http_rule
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:
    memberspolicy: balance1
   - network: ovn-net1
      weight: src_ip: 192.168.1.2
      metric: 2
    - network: ovn-net2
      weight: 3
      metric: 3dest_ip: 0.0.0.0/0
  dest_port: 80
  proto: tcp
status:
  appliedVersion: "2"
  appliedTime: "2020-03-29T04:21:48Z"
  inSync: True


CR samples of Firewall type:


Code Block
title
languageymlMwan3Rule CR
apiVersion: batch.sdewan.akraino.org/v1alpha1
kind: Mwan3RuleFirewallZone
metadata:
  name: http_rulelan1
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:
  policy  newtork:
 balance1   src_ip: 192.168.1.2 -  dest_ip: 0.0.0.0/0ovn-net1
    dest_portinput: 80ACCEPT
    protooutput: tcpACCEPT
status:
  appliedVersion: "2"
  appliedTime: "2020-03-29T04:21:48Z"
  inSync: True

...



 Code Block
languageyml
apiVersion: batch.sdewan.akraino.org/v1alpha1
kind: FirewallZoneFirewallRule
metadata:
  name: lan1reject_80
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:  
  newtorksrc: lan1
     - ovn-net1
 src_ip: 192.168.1.2
  src_port: 80
  inputproto: ACCEPTtcp
    outputtarget: ACCEPTREJECT
status:
  appliedVersion: "2"
  appliedTime: "2020-03-29T04:21:48Z"
  inSync: True
...
 Code Block
languageyml
apiVersion: batch.sdewan.akraino.org/v1alpha1
kind: FirewallRuleFirewallSNAT
metadata:
  name: rejectsnat_80lan1
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:  
  src: lan1
  src_ip: 192.168.1.2
  src_portdip: 801.2.3.4
  protodest: tcpwan1
  targetproto: REJECTicmp
status:
  appliedVersion: "2"
  appliedTime: "2020-03-29T04:21:48Z"
  inSync: True
...
 Code Block
languageyml
apiVersion: batch.sdewan.akraino.org/v1alpha1
kind: FirewallSNATFirewallDNAT
metadata:
  name: snatdnat_lan1wan1
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:  
  src: lan1wan1
  src_ip: 192.168.1.2dport: 19900
  dest: lan1
  srcdest_dipip: 1192.2168.31.41
  dest_port: wan122
  proto: icmptcp
status:
  appliedVersion: "2"
  appliedTime: "2020-03-29T04:21:48Z"
  inSync: True
...
 Code Block
languageyml
apiVersion: batch.sdewan.akraino.org/v1alpha1
kind: FirewallDNATFirewallForwarding
metadata:
  name: dnat_wan1 forwarding_lan_to_wan
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:  
  src: wan1
  src_dport: 19900
  dest: lan1
 
dest_ip: 192.168.1.1   dest_port: 22
  proto: tcpwan1
status:
  appliedVersion: "2"
  appliedTime: "2020-03-29T04:21:48Z"
  inSync: True

CR samples of IPSec type(ruoyu):
 Code Block
languageyml
titleIPSec Proposal CR
apiVersion: batch.sdewan sdewan.akraino.org/v1alpha1
kind: FirewallForwarding IpsecProposal
metadata:
  name: forwarding_lan_to_wan  name: test_proposal_1
  namespace: default
  labels:
    sdewanPurpose: cnf-1
specspec:
  encryption_algorithm: aes128
   srchash_algorithm: lan1sha256
  destdh_group: wan1modp3072
status:
  appliedVersion: "21"
  appliedTime: "2020-0304-29T0412T09:2128:48Z38Z"
  inSync: True
CR samples of IPSec type(ruoyu):




 Code Block
languageyml
titleIPSec Proposal Site CR
apiVersion: sdewan.akraino.org/v1alpha1
kind: IpsecProposal IpsecSite
metadata:
  name: test_proposal_1 ipsecsite-sample
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:
  encryption_algorithm: aes128 remote: xx.xx.xx.xx
  authentication_method: psk
  hashpre_shared_algorithmkey: sha256xxx
  dhlocal_public_groupcert: modp3072
status 
  local_private_cert:
  appliedVersionshared_ca:
"1"   appliedTime: "2020-04-12T09:28:38Z"local_identifier:
  remote_identifier:
  inSynccrypto_proposal: True
 
 Code Block
languageyml
titleIPSec Site CR
apiVersion: sdewan.akraino.org/v1alpha1 kind: IpsecSite metadata:   name: ipsecsite-sample- test_proposal_1
  namespaceconnections:
default   labels: - connection_name: connection_A
 sdewanPurpose: cnf-1 spec:   remotetype: xx.xx.xx.xxtunnel
  authentication_method: psk   pre_shared_keymode: xxxstart
  local_public_cert:    local_private_certsubnet: 172.12.0.0/24,  shared_ca:10.239.160.22
   local_identifier:   remote_identifier:sourceip: 172.12.0.30-172.12.0.45
      cryptoremote_proposalsubnet:
     - testcrypto_proposal_1:
   connections:     - connection_nametest_proposal_1
status:
connection_A  appliedVersion: "1"
   type: tunnel
      mode: start
      local_subnet: 172.12.0.0/24, 10.239.160.22
 appliedTime: "2020-04-12T09:28:38Z"
  inSync: True



 Code Block
languageyml
titleIPSec Host CR
apiVersion: sdewan.akraino.org/v1alpha1
kind: IpsecHost
metadata:
  name: ipsechost-sample
  namespace: default
  labels:
    remote_sourceipsdewanPurpose: 172.12.0.30-172.12.0.45cnf-1
spec:
  remote: xx.xx.xx.xx/%any
  remoteauthentication_subnetmethod: psk
     crypto_proposalpre_shared_key: xxx
  local_public_cert: 
   - test_proposal_1
statuslocal_private_cert:
  appliedVersion: "1"shared_ca:
  appliedTime: "2020-04-12T09:28:38Z"local_identifier:
  inSyncremote_identifier:
True  
 Code Block
languageyml
titleIPSec Host CR
apiVersion: sdewan.akraino.org/v1alpha1
kind: IpsecHost
metadata:
  name: ipsechost-sample
  namespace: default
  labels:
    sdewanPurpose: cnf-1
spec:
  remote: xx.xx.xx.xx/%any
  authentication_method: psk
  pre_shared_key: xxx
  local_public_cert:crypto_proposal: 
    - test_proposal_1
  connections:
    - connection_name: connection_A
      type: tunnel
      mode: start
      local_private_certsourceip: %config
 shared_ca:   local_identifier:   remote_identifiersourceip: xx.xx.xx.xx
 crypto_proposal:      - test_proposal_1
  connections:remote_subnet: xx.xx.xx.xx/xx
      - connectioncrypto_nameproposal:
connection_A       type: tunnel- test_proposal_1 
status:
   modeappliedVersion: start"1"
      local_sourceip: %config
      remote_sourceip: xx.xx.xx.xx
      remote_subnet: xx.xx.xx.xx/xx
      crypto_proposalappliedTime: "2020-04-12T09:28:38Z"
  inSync: True



CNF Service CR
.spec.fullname - The full name of the target service, with which we can get the service IP
.spec.port - The port exposed by CNF, we will do DNAT for the requests accessing this port of CNF
.spec.dport - The port exposed by target service
 Code Block
languageyml
titleCNF Service CR
apiVersion: batch.sdewan.akraino.org/v1alpha1
kind: CNFService
metadata:
  name: cnfservice-sample
  namespace: default
  labels:
    sdewanPurpose: cnf1
spec:
 - test_proposal_1  statusfullname: httpd-svc.default.svc.cluster.local
 appliedVersion   port: "12288"
   appliedTime dport: "2020-04-12T09:28:38Z8080"
  inSync: True


Sdewan rule CRD Reconcile Logic
As we have many kinds of CRDs, they have almost the same reconcile logic. So we only describe the Mwan3Rule logic.
...
 Code Block
languagepy
def Mwan3RuleReconciler.Reconcile(req ctrl.Request):
  rule_cr = k8sClient.get(req.NamespacedName)
  cnf_deployment = k8sClient.get_deployment_with_label(rule_cr.labels.sdewanPurpose)
  if rule_cr DeletionTimestamp exists:
    # The CR is being deleted. finalizer on the CR
    if cnf_deployment exists:
      if cnf_deployment is ready:
        for cnf_pod in cnf_deployment:
          err = openwrt_client.delete_rule(cnf_pod_ip, rule_cr)
          if err:
            return "re-queue req"
        rule_cr.finalizer = nil
        return "ok"
      else:
        return "re-queue req"
    else:
      # Just remove finalizer, because no CNF pod exists
      rule_cr.finalizer = nil
      return "ok"
  else:
    # The CR is not being deleted
    if cnf_deployment not exist:
      return "ok"
    else:
      if cnf_deployment not ready:
        # set appliedVersion = nil if cnf_deployment get into not_ready status
        rule_cr.status.appliedVersion = nil
        return "re-queue req"
      else:
        for cnf_pod in cnf_deployment:
          runtime_cr = openwrt_client.get_rule(cnf_pod_ip)
          if runtime_cr != rule_cr:
            err = openwrt_client.add_or_update_rule(cnf_pod_ip, rule_cr)
            if err:
              # err could be caused by dependencies not-applied or other reason
              return "re-queue req"
        # set appliedVerson only when it's applied for all the cnf pods
        rule_cr.finalizer = cnf_finalizer
        rule_cr.status.appliedVersion = rule_cr.resourceVersion
        rule_cr.status.inSync = True
        return "ok"
Unsual Cases
In the following cases, when we say "call CNF api to create/update/delte rule", it means the logic below:
...
  • A deployment(CNF) for a given purpose has two pod replicas (CNF-pod-1 and CNF-pod-2)
  • Controller is also brought yup.
  • CNF-pod-1 and CNF-pod-2 are both running with no/default configuration.
  • MWAN3 policy 1 is added
  • MWAN3 rule 1 and Rule 2 are added to use MWAN3 Policy1.
  • Since all controller, CNF-pod-1 and CNF-pod-2 are running, CNF-pod-1 and CNF-pod-2 has configuration MWAN3 Policy1, rule1 and rule2.
  • Controller is down for 10 minutes.
  • After controller goes down, CNF-pod-1 is down
     Info
    As controller is down, so no event, no reconcile.

  • MWAN3 rule 1 is deleted.
     Info
    As controller is down, so no event, no reconcile. rule1 CR is not deleted from etcd because of finalizer. Instead, DeleteTimestamp is added to rule1 CR by k8s

  • MWAN3 rule 3 added
     Info
    As controller is down, no event no reconcile. rule3 CR is added to etcd, but not applied onto CNF. rule3 status.appliedVersion and status.appliedTime and status.inSync are nil/default value.

  • For MWAN3 rule 2, we don't make any change
  • CNF-pod-1 is up
     Info
    As controller is down, so no event, no reconcile. As pod restart, CNF-pod-1 is running with no/default configuration.

  • Controller is up.
     Info
    Controller reconciles for all CRs. For rule1 CR, controller calls cnf api to delete rule1 from both CNF-pod-1 and CNF-pod-2. Then controller removes finalizer from the rule1 CR, then rule1 CR is deleted from etcd by k8s. For rule2, controller calls cnf api to update rul2 for both CNF-pod-1 and CNF-pod-2. Then set rule2 status.appliedVersion=<current-version> and status.appliedTime=<now-time> and status.inSync=true. For rule3, controller calls cnf api to add rul3 for both CNF-pod-1 and CNF-pod-2. Then set rule3 finalizer. Also set rule3 status.appliedVersion=<current-version> and status.appliedTime=<now-time> and status.inSync=true.

  • Ensure that CNF-pod-1 and CNF-pod-2 have latest configuration and there is no duplicate information.
     Info
    Once the reconcile finish, both CNF-pod-1 and CNF-pod-2 have latest configuration.

Admission Webhook Usage
We use admission webhook to implemention several features.
  1. Prevent creating more than one CNF of the same lable and the same namespace
  2. Validate CR dependencies. For example, mwan3 rule depends on mwan3 policy
  3. Extend user permission to control the operations on rule CRs. For example, we can control that ONAP can't update/delete rule CRs created by platform.
Sdewan rule CR type level Permission Implementation
8s support permission control on namespace level. For example, user1 may be able to create/update/delete one kind of resource(e.g. pod) in namespace ns1, but not namespace ns2. For Sdewan, this can't fit our requirement. We want label level control of Sdewan rule CRs. For example, user_onap can create/update/delete Mwan3Rule CR of label sdewan-bucket-type=app-intent, but not label sdewan-bucket-type=basic.
...
 Code Block
languagepy
def mwan3rule_webhook_handle_permission(req admission.Request):
  userinfo = req["userInfo]
  mwan3rule_cr = decode(req)
  roles = k8s_client.get_role_from_user(userinfo)
  for role in roles:
    if mwan3rule_cr.labels.sdewan-bucket-type in role.annotation.sdewan-bucket-type-permission.mwan3rules:
      return {"allowd": True}
  return {"allowd": False}

ServiceRule controller (For next release)
We create a controller watches the services created in the cluster. For each service, it creates a FirewallDNAT CR. On controller startup, it makes a syncup to remove unused CRs.
References
...