88377fa346
This adds basic plugins. "main" types: veth, bridge, macvlan "ipam" type: host-local The code has been ported over from github.com/coreos/rkt project and adapted to fit the CNI spec.
87 lines
1.9 KiB
Go
87 lines
1.9 KiB
Go
// Copyright 2015 CoreOS, Inc.
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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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"encoding/json"
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"math/big"
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"net"
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)
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// ParseCIDR takes a string like "10.2.3.1/24" and
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// return IPNet with "10.2.3.1" and /24 mask
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func ParseCIDR(s string) (*net.IPNet, error) {
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ip, ipn, err := net.ParseCIDR(s)
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if err != nil {
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return nil, err
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}
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ipn.IP = ip
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return ipn, nil
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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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// like net.IPNet but adds JSON marshalling and unmarshalling
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type IPNet net.IPNet
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func (n IPNet) MarshalJSON() ([]byte, error) {
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return json.Marshal((*net.IPNet)(&n).String())
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}
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func (n *IPNet) UnmarshalJSON(data []byte) error {
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var s string
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if err := json.Unmarshal(data, &s); err != nil {
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return err
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}
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tmp, err := ParseCIDR(s)
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if err != nil {
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return err
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}
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*n = IPNet(*tmp)
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return nil
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}
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