0becca2e96
CNI is developed by more than just CoreOS, Inc and the copyright is retained by all CNI contributors (for their respective contributed code).
52 lines
1.2 KiB
Go
52 lines
1.2 KiB
Go
// Copyright 2015 CNI authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ip
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import (
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"math/big"
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"net"
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)
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// NextIP returns IP incremented by 1
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func NextIP(ip net.IP) net.IP {
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i := ipToInt(ip)
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return intToIP(i.Add(i, big.NewInt(1)))
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}
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// PrevIP returns IP decremented by 1
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func PrevIP(ip net.IP) net.IP {
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i := ipToInt(ip)
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return intToIP(i.Sub(i, big.NewInt(1)))
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}
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func ipToInt(ip net.IP) *big.Int {
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if v := ip.To4(); v != nil {
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return big.NewInt(0).SetBytes(v)
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}
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return big.NewInt(0).SetBytes(ip.To16())
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}
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func intToIP(i *big.Int) net.IP {
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return net.IP(i.Bytes())
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}
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// Network masks off the host portion of the IP
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func Network(ipn *net.IPNet) *net.IPNet {
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return &net.IPNet{
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IP: ipn.IP.Mask(ipn.Mask),
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Mask: ipn.Mask,
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}
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}
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