mirror of https://github.com/k3s-io/k3s
62 lines
1.4 KiB
Go
62 lines
1.4 KiB
Go
|
// Copyright 2015 CNI authors
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
// you may not use this file except in compliance with the License.
|
||
|
|
// You may obtain a copy of the License at
|
||
|
|
//
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
//
|
||
|
|
// Unless required by applicable law or agreed to in writing, software
|
||
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
// See the License for the specific language governing permissions and
|
||
|
|
// limitations under the License.
|
||
|
|
|
||
|
|
package ip
|
||
|
|
|
||
|
|
import (
|
||
|
|
"math/big"
|
||
|
|
"net"
|
||
|
|
)
|
||
|
|
|
||
|
|
// NextIP returns IP incremented by 1
|
||
|
|
func NextIP(ip net.IP) net.IP {
|
||
|
|
i := ipToInt(ip)
|
||
|
|
return intToIP(i.Add(i, big.NewInt(1)))
|
||
|
|
}
|
||
|
|
|
||
|
|
// PrevIP returns IP decremented by 1
|
||
|
|
func PrevIP(ip net.IP) net.IP {
|
||
|
|
i := ipToInt(ip)
|
||
|
|
return intToIP(i.Sub(i, big.NewInt(1)))
|
||
|
|
}
|
||
|
|
|
||
|
|
// Cmp compares two IPs, returning the usual ordering:
|
||
|
|
// a < b : -1
|
||
|
|
// a == b : 0
|
||
|
|
// a > b : 1
|
||
|
|
func Cmp(a, b net.IP) int {
|
||
|
|
aa := ipToInt(a)
|
||
|
|
bb := ipToInt(b)
|
||
|
|
return aa.Cmp(bb)
|
||
|
|
}
|
||
|
|
|
||
|
|
func ipToInt(ip net.IP) *big.Int {
|
||
|
|
if v := ip.To4(); v != nil {
|
||
|
|
return big.NewInt(0).SetBytes(v)
|
||
|
|
}
|
||
|
|
return big.NewInt(0).SetBytes(ip.To16())
|
||
|
|
}
|
||
|
|
|
||
|
|
func intToIP(i *big.Int) net.IP {
|
||
|
|
return net.IP(i.Bytes())
|
||
|
|
}
|
||
|
|
|
||
|
|
// Network masks off the host portion of the IP
|
||
|
|
func Network(ipn *net.IPNet) *net.IPNet {
|
||
|
|
return &net.IPNet{
|
||
|
|
IP: ipn.IP.Mask(ipn.Mask),
|
||
|
|
Mask: ipn.Mask,
|
||
|
|
}
|
||
|
|
}
|