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[feature]: add dummy network interface for yurthub
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| /* | ||
| Copyright 2021 The OpenYurt 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 network | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net" | ||
|
|
||
| "k8s.io/klog" | ||
|
|
||
| "github.com/vishvananda/netlink" | ||
| ) | ||
|
|
||
| type DummyInterfaceController interface { | ||
| EnsureDummyInterface(ifName string, ifIP net.IP) error | ||
| DeleteDummyInterface(ifName string) error | ||
| ListDummyInterface(ifName string) ([]net.IP, error) | ||
| } | ||
|
|
||
| type dummyInterfaceController struct { | ||
| netlink.Handle | ||
| } | ||
|
|
||
| // NewDummyInterfaceManager returns an instance for create/delete dummy net interface | ||
| func NewDummyInterfaceController() DummyInterfaceController { | ||
| return &dummyInterfaceController{ | ||
| Handle: netlink.Handle{}, | ||
| } | ||
| } | ||
|
|
||
| // EnsureDummyInterface make sure the dummy net interface with specified name and ip exist | ||
| func (dic *dummyInterfaceController) EnsureDummyInterface(ifName string, ifIP net.IP) error { | ||
| link, err := dic.LinkByName(ifName) | ||
| if err == nil { | ||
| addrs, err := dic.AddrList(link, 0) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| for _, addr := range addrs { | ||
| if addr.IP != nil && addr.IP.Equal(ifIP) { | ||
| return nil | ||
| } | ||
| } | ||
|
|
||
| klog.Infof("ip address for %s interface changed to %s", ifName, ifIP.String()) | ||
| return dic.AddrReplace(link, &netlink.Addr{IPNet: netlink.NewIPNet(ifIP)}) | ||
| } | ||
| return dic.addDummyInterface(ifName, ifIP) | ||
| } | ||
|
|
||
| // addDummyInterface creates a dummy net interface with the specified name and ip | ||
| func (dic *dummyInterfaceController) addDummyInterface(ifName string, ifIP net.IP) error { | ||
| _, err := dic.LinkByName(ifName) | ||
| if err == nil { | ||
| return fmt.Errorf("Link %s exists", ifName) | ||
| } | ||
|
|
||
| dummy := &netlink.Dummy{ | ||
| LinkAttrs: netlink.LinkAttrs{Name: ifName}, | ||
| } | ||
| err = dic.LinkAdd(dummy) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| link, err := dic.LinkByName(ifName) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return dic.AddrAdd(link, &netlink.Addr{IPNet: netlink.NewIPNet(ifIP)}) | ||
| } | ||
|
|
||
| // DeleteDummyInterface delete the dummy net interface with specified name | ||
| func (dic *dummyInterfaceController) DeleteDummyInterface(ifName string) error { | ||
| link, err := dic.LinkByName(ifName) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return dic.LinkDel(link) | ||
| } | ||
|
|
||
| // ListDummyInterface list all ips for network interface specified by ifName | ||
| func (dic *dummyInterfaceController) ListDummyInterface(ifName string) ([]net.IP, error) { | ||
| ips := make([]net.IP, 0) | ||
| link, err := dic.LinkByName(ifName) | ||
| if err != nil { | ||
| return ips, err | ||
| } | ||
|
|
||
| addrs, err := dic.AddrList(link, 0) | ||
| if err != nil { | ||
| return ips, err | ||
| } | ||
|
|
||
| for _, addr := range addrs { | ||
| if addr.IP != nil { | ||
| ips = append(ips, addr.IP) | ||
| } | ||
| } | ||
|
|
||
| return ips, nil | ||
| } |
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