forked from yamt/midonet-kubernetes
/
nodeip.go
47 lines (42 loc) · 1.45 KB
/
nodeip.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
// Copyright (C) 2018 Midokura SARL.
// All rights reserved.
//
// 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 node
import (
"net"
"github.com/containernetworking/plugins/pkg/ip"
)
// SubnetInfo contains the special IP addresses for the Node.
type SubnetInfo struct {
GatewayIP net.IPNet
NodeIP net.IPNet
Subnet net.IPNet
}
// GetSubnetInfo calculates SubnetInfo from the given podCIDR.
func GetSubnetInfo(podCIDR string) (*SubnetInfo, error) {
// Use the first IP for the gateway.
// Use the next one for the IP for the interface to connect the node.
// This should be consistent with the Node converter.
addr, subnet, err := net.ParseCIDR(podCIDR)
if err != nil {
return nil, err
}
gatewayIP := ip.NextIP(addr)
nodeIP := ip.NextIP(gatewayIP)
return &SubnetInfo{
GatewayIP: net.IPNet{IP: gatewayIP, Mask: subnet.Mask},
NodeIP: net.IPNet{IP: nodeIP, Mask: subnet.Mask},
Subnet: *subnet,
}, nil
}