func ensureLink(vxlan *netlink.Vxlan) (*netlink.Vxlan, error) { err := netlink.LinkAdd(vxlan) if err == syscall.EEXIST { // it's ok if the device already exists as long as config is similar existing, err := netlink.LinkByName(vxlan.Name) if err != nil { return nil, err } incompat := vxlanLinksIncompat(vxlan, existing) if incompat == "" { return existing.(*netlink.Vxlan), nil } // delete existing log.Warningf("%q already exists with incompatable configuration: %v; recreating device", vxlan.Name, incompat) if err = netlink.LinkDel(existing); err != nil { return nil, fmt.Errorf("failed to delete interface: %v", err) } // create new if err = netlink.LinkAdd(vxlan); err != nil { return nil, fmt.Errorf("failed to create vxlan interface: %v", err) } } else if err != nil { return nil, err } ifindex := vxlan.Index link, err := netlink.LinkByIndex(vxlan.Index) if err != nil { return nil, fmt.Errorf("can't locate created vxlan device with index %v", ifindex) } var ok bool if vxlan, ok = link.(*netlink.Vxlan); !ok { return nil, fmt.Errorf("created vxlan device with index %v is not vxlan", ifindex) } return vxlan, nil }
func (dev *vxlanDevice) Destroy() { netlink.LinkDel(dev.link) }