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cidr.go
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cidr.go
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package cidr
import (
"net"
"github.com/spf13/pflag"
k8sutilnet "k8s.io/utils/net"
)
var (
_, PrivateIPv4Net1, _ = net.ParseCIDR("10.0.0.0/8")
_, PrivateIPv4Net2, _ = net.ParseCIDR("172.16.0.0/12")
_, PrivateIPv4Net3, _ = net.ParseCIDR("192.168.0.0/16")
_, PrivateIPv6Net, _ = net.ParseCIDR("fc00::/7")
PrivateIPv4Nets = []*net.IPNet{PrivateIPv4Net1, PrivateIPv4Net2, PrivateIPv4Net3}
PrivateIPv4NetsString = []string{"10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16"}
PrivateIPv6Nets = []*net.IPNet{PrivateIPv6Net}
PrivateIPv6NetsString = []string{"fc00::/7"}
_, IPv4ZeroCIDR, _ = net.ParseCIDR("0.0.0.0/0")
_, IPv6ZeroCIDR, _ = net.ParseCIDR("::/0")
_, LinkLocalCIDR, _ = net.ParseCIDR("169.254.0.0/16")
// subnetAvailableIndex Which index IP address is available in a subnet
// In BCE Cloud, the index is 2
// In a private cloud, the number may be 4
subnetAvailableIndex = 2
)
func RegisterCIDRFlags(pset *pflag.FlagSet) {
pset.IntVar(&subnetAvailableIndex, "subnet-available-index", subnetAvailableIndex, "Which index IP address is available in a subnet")
}
func IsUnicastIP(ip net.IP, subnet string) bool {
if !ip.IsGlobalUnicast() {
return false
}
cidrs, err := k8sutilnet.ParseCIDRs([]string{subnet})
if err != nil {
return false
}
for _, ranges := range cidrs {
if !ranges.Contains(ip) {
return false
}
}
reservedIPs := ListFirtstAndLastIPStringFromCIDR(subnet)
for _, reserved := range reservedIPs {
if ip.Equal(reserved) {
return false
}
}
return true
}
func ListIPsFromCIDR(cidr *net.IPNet) []net.IP {
var ipList []net.IP
size := k8sutilnet.RangeSize(cidr)
if size == 0 {
return []net.IP{cidr.IP}
}
var i int64
for i = 0; i < size; i++ {
ip, err := k8sutilnet.GetIndexedIP(cidr, int(i))
if err != nil {
continue
}
ipList = append(ipList, ip)
}
return ipList
}
func ListIPsFromCIDRString(cidr string) []net.IP {
cidrs, err := k8sutilnet.ParseCIDRs([]string{cidr})
if err != nil {
return []net.IP{}
}
return ListIPsFromCIDR(cidrs[0])
}
func ListIPsStringFromCIDR(cidr string) []string {
var ipList []string
cidrs, err := k8sutilnet.ParseCIDRs([]string{cidr})
if err != nil {
return ipList
}
for _, cidr := range cidrs {
ips := ListIPsFromCIDR(cidr)
for _, ip := range ips {
ipList = append(ipList, ip.String())
}
}
return ipList
}
func ListFirtstAndLastIPStringFromCIDR(cidr string) []net.IP {
var ipList []net.IP
cidrs, err := k8sutilnet.ParseCIDRs([]string{cidr})
if err != nil {
return ipList
}
for _, cidr := range cidrs {
size := k8sutilnet.RangeSize(cidr)
if size == 0 {
return []net.IP{cidr.IP}
}
// Exclude first ip
// The first IP address of the subnet is usually the gateway address
for i := 0; i < subnetAvailableIndex && i < int(size); i++ {
ip, err := k8sutilnet.GetIndexedIP(cidr, i)
if err == nil {
ipList = append(ipList, ip)
}
}
ip, err := k8sutilnet.GetIndexedIP(cidr, int(size-1))
if err == nil {
ipList = append(ipList, ip)
}
}
return ipList
}