[BUG] ipv4 subnet cidr 0.0.0.0/0 should be checked as a invalid cidr

[bobz965]

Kube-OVN Version

master

Kubernetes Version

1.21

Operation-system/Kernel Version

4.19

Description

# k get subnet autoapi-vxlan-4385 -o yaml
apiVersion: kubeovn.io/v1
kind: Subnet
metadata:
  annotations:
    cluster.ecloud.cmss.com/resource: "true"
  creationTimestamp: "2024-08-08T02:29:21Z"
  generation: 2
  labels:
    eis.io/creator: admin
  name: autoapi-vxlan-4385
  resourceVersion: "245557324"
  uid: 1181f275-fa69-4f36-84d2-a9b7eacc17ee
spec:
  cidrBlock: 0.0.0.0/0
  default: false
  disableGatewayCheck: true
  disableInterConnection: true
  enableLb: false
  excludeIps:
  - 0.0.0.1
  gateway: 0.0.0.1
  gatewayNode: ""
  gatewayType: distributed
  natOutgoing: true
  private: false
  protocol: IPv4
  provider: ovn
  vpc: autoapi-vpc8313
status:
  activateGateway: ""
  conditions:
  - lastTransitionTime: "2024-08-08T02:29:21Z"
    lastUpdateTime: "2024-08-08T02:29:21Z"
    message: 0.0.0.0/0 conflict with v4 broadcast cidr 255.255.255.255/32
    reason: ValidateLogicalSwitchFailed
    status: "True"
    type: Error
  - lastTransitionTime: "2024-08-08T02:29:21Z"
    lastUpdateTime: "2024-08-08T02:29:21Z"
    message: 0.0.0.0/0 conflict with v4 broadcast cidr 255.255.255.255/32
    reason: ValidateLogicalSwitchFailed
    status: "False"
    type: Validated
  - lastTransitionTime: "2024-08-08T02:29:21Z"
    lastUpdateTime: "2024-08-08T02:29:21Z"
    message: 0.0.0.0/0 conflict with v4 broadcast cidr 255.255.255.255/32
    reason: ValidateLogicalSwitchFailed
    status: "False"
    type: Ready
  dhcpV4OptionsUUID: ""
  dhcpV6OptionsUUID: ""
  u2oInterconnectionIP: ""
  u2oInterconnectionMAC: ""
  u2oInterconnectionVPC: ""
  v4availableIPrange: 0.0.0.2-255.255.255.254
  v4availableIPs: 4294967293
  v4usingIPrange: ""
  v4usingIPs: 0
  v6availableIPrange: ""
  v6availableIPs: 0
  v6usingIPrange: ""
  v6usingIPs: 0

Steps To Reproduce

1. create a subnet ipv4 cidr is 0.0.0.0/0

Current Behavior

0.0.0.0/0 conflict with v4 broadcast cidr 255.255.255.255/32

Expected Behavior

0.0.0.0/0 is an invalid subnet cidr, it is used in some special case, can not used in subnet cidr