/
ipfamily.go
85 lines (73 loc) · 2.03 KB
/
ipfamily.go
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// SPDX-License-Identifier:Apache-2.0
package ipfamily // import "go.universe.tf/metallb/internal/ipfamily"
import (
"fmt"
"net"
v1 "k8s.io/api/core/v1"
)
// IP family helps identifying single stack IPv4/IPv6 vs Dual-stack ["IPv4", "IPv6"] or ["IPv6", "Ipv4"].
type Family string
func (f Family) String() string {
return string(f)
}
const (
IPv4 Family = "ipv4"
IPv6 Family = "ipv6"
DualStack Family = "dual"
Unknown Family = "unknown"
)
// ForAddresses returns the address family given list of addresses strings.
func ForAddresses(ips []string) (Family, error) {
switch len(ips) {
case 1:
ip := net.ParseIP(ips[0])
if ip.To4() != nil {
return IPv4, nil
} else {
return IPv6, nil
}
case 2:
ip1 := net.ParseIP(ips[0])
ip2 := net.ParseIP(ips[1])
if ip1 == nil || ip2 == nil {
return Unknown, fmt.Errorf("IPFamilyForAddresses: Invalid address %q", ips)
}
if (ip1.To4() == nil) == (ip2.To4() == nil) {
return Unknown, fmt.Errorf("IPFamilyForAddresses: same address family %q", ips)
}
return DualStack, nil
default:
return Unknown, fmt.Errorf("IPFamilyForAddresses: invalid ips length %d %q", len(ips), ips)
}
}
// ForAddressesIPs returns the address family from a given list of addresses IPs.
func ForAddressesIPs(ips []net.IP) (Family, error) {
ipsStrings := []string{}
for _, ip := range ips {
ipsStrings = append(ipsStrings, ip.String())
}
return ForAddresses(ipsStrings)
}
// ForCIDR returns the address family from a given CIDR.
func ForCIDR(cidr *net.IPNet) Family {
if cidr.IP.To4() == nil {
return IPv6
}
return IPv4
}
// ForAddress returns the address family for a given address.
func ForAddress(ip net.IP) Family {
if ip.To4() == nil {
return IPv6
}
return IPv4
}
// ForService returns the address family of a given service.
func ForService(svc *v1.Service) (Family, error) {
if len(svc.Spec.ClusterIPs) > 0 {
return ForAddresses(svc.Spec.ClusterIPs)
}
// fallback to clusterip if clusterips are not set
addresses := []string{svc.Spec.ClusterIP}
return ForAddresses(addresses)
}