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pod_cidr.go
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pod_cidr.go
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package utils
import (
"fmt"
"net"
"strings"
v1core "k8s.io/api/core/v1"
netutils "k8s.io/utils/net"
)
const (
// deprecated - we now use multiple CIDRs, so it is better for users to use kube-router.io/pod-cidrs which allows
// you to express all of the cidrs you want to advertise from a given node
podCIDRAnnotation = "kube-router.io/pod-cidr"
podCIDRsAnnotation = "kube-router.io/pod-cidrs"
)
// GetPodCidrFromNodeSpec reads the pod CIDR allocated to the node from API node object and returns it
func GetPodCidrFromNodeSpec(node *v1core.Node) (string, error) {
if cidr, ok := node.Annotations[podCIDRAnnotation]; ok {
_, _, err := net.ParseCIDR(cidr)
if err != nil {
return "", fmt.Errorf("error parsing pod CIDR in node annotation: %v", err)
}
return cidr, nil
}
if node.Spec.PodCIDR == "" {
return "", fmt.Errorf("node.Spec.PodCIDR not set for node: %v", node.Name)
}
return node.Spec.PodCIDR, nil
}
// GetPodCIDRsFromNodeSpecDualStack reads the IPv4 and IPv6 pod CIDR allocated
// to the node from API node object and returns them
func GetPodCIDRsFromNodeSpecDualStack(node *v1core.Node) ([]string, []string, error) {
var podIPv4CIDRs, podIPv6CIDRs []string
if podCIDRs, ok := node.Annotations[podCIDRsAnnotation]; ok {
for _, cidr := range strings.Split(podCIDRs, ",") {
if _, _, err := net.ParseCIDR(cidr); err != nil {
return podIPv4CIDRs, podIPv6CIDRs, fmt.Errorf("error parsing pod CIDR in node annotation: %v", err)
}
if netutils.IsIPv4CIDRString(cidr) {
podIPv4CIDRs = append(podIPv4CIDRs, cidr)
}
if netutils.IsIPv6CIDRString(cidr) {
podIPv6CIDRs = append(podIPv6CIDRs, cidr)
}
}
return podIPv4CIDRs, podIPv6CIDRs, nil
}
if len(node.Spec.PodCIDRs) == 0 {
return nil, nil, fmt.Errorf("node.Spec.PodCIDRs empty for node: %v", node.Name)
}
for _, podCIDR := range node.Spec.PodCIDRs {
if netutils.IsIPv4CIDRString(podCIDR) {
podIPv4CIDRs = append(podIPv4CIDRs, podCIDR)
}
if netutils.IsIPv6CIDRString(podCIDR) {
podIPv6CIDRs = append(podIPv6CIDRs, podCIDR)
}
}
return podIPv4CIDRs, podIPv6CIDRs, nil
}