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openstack_routes.go
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openstack_routes.go
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/*
Copyright 2016 The Kubernetes 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 openstack
import (
"errors"
"github.com/gophercloud/gophercloud"
"github.com/gophercloud/gophercloud/openstack/compute/v2/servers"
"github.com/gophercloud/gophercloud/openstack/networking/v2/extensions/layer3/routers"
neutronports "github.com/gophercloud/gophercloud/openstack/networking/v2/ports"
"github.com/golang/glog"
"k8s.io/apimachinery/pkg/types"
"k8s.io/kubernetes/pkg/cloudprovider"
)
var ErrNoRouterId = errors.New("router-id not set in cloud provider config")
type Routes struct {
compute *gophercloud.ServiceClient
network *gophercloud.ServiceClient
opts RouterOpts
}
func NewRoutes(compute *gophercloud.ServiceClient, network *gophercloud.ServiceClient, opts RouterOpts) (cloudprovider.Routes, error) {
if opts.RouterId == "" {
return nil, ErrNoRouterId
}
return &Routes{
compute: compute,
network: network,
opts: opts,
}, nil
}
func (r *Routes) ListRoutes(clusterName string) ([]*cloudprovider.Route, error) {
glog.V(4).Infof("ListRoutes(%v)", clusterName)
nodeNamesByAddr := make(map[string]types.NodeName)
err := foreachServer(r.compute, servers.ListOpts{}, func(srv *servers.Server) (bool, error) {
addrs, err := nodeAddresses(srv)
if err != nil {
return false, err
}
name := mapServerToNodeName(srv)
for _, addr := range addrs {
nodeNamesByAddr[addr.Address] = name
}
return true, nil
})
if err != nil {
return nil, err
}
router, err := routers.Get(r.network, r.opts.RouterId).Extract()
if err != nil {
return nil, err
}
var routes []*cloudprovider.Route
for _, item := range router.Routes {
nodeName, foundNode := nodeNamesByAddr[item.NextHop]
route := cloudprovider.Route{
Name: item.DestinationCIDR,
TargetNode: nodeName, //empty if NextHop is unknown
Blackhole: !foundNode,
DestinationCIDR: item.DestinationCIDR,
}
routes = append(routes, &route)
}
return routes, nil
}
func updateRoutes(network *gophercloud.ServiceClient, router *routers.Router, newRoutes []routers.Route) (func(), error) {
origRoutes := router.Routes // shallow copy
_, err := routers.Update(network, router.ID, routers.UpdateOpts{
Routes: newRoutes,
}).Extract()
if err != nil {
return nil, err
}
unwinder := func() {
glog.V(4).Info("Reverting routes change to router ", router.ID)
_, err := routers.Update(network, router.ID, routers.UpdateOpts{
Routes: origRoutes,
}).Extract()
if err != nil {
glog.Warning("Unable to reset routes during error unwind: ", err)
}
}
return unwinder, nil
}
func updateAllowedAddressPairs(network *gophercloud.ServiceClient, port *neutronports.Port, newPairs []neutronports.AddressPair) (func(), error) {
origPairs := port.AllowedAddressPairs // shallow copy
_, err := neutronports.Update(network, port.ID, neutronports.UpdateOpts{
AllowedAddressPairs: &newPairs,
}).Extract()
if err != nil {
return nil, err
}
unwinder := func() {
glog.V(4).Info("Reverting allowed-address-pairs change to port ", port.ID)
_, err := neutronports.Update(network, port.ID, neutronports.UpdateOpts{
AllowedAddressPairs: &origPairs,
}).Extract()
if err != nil {
glog.Warning("Unable to reset allowed-address-pairs during error unwind: ", err)
}
}
return unwinder, nil
}
func (r *Routes) CreateRoute(clusterName string, nameHint string, route *cloudprovider.Route) error {
glog.V(4).Infof("CreateRoute(%v, %v, %v)", clusterName, nameHint, route)
onFailure := NewCaller()
addr, err := getAddressByName(r.compute, route.TargetNode)
if err != nil {
return err
}
glog.V(4).Infof("Using nexthop %v for node %v", addr, route.TargetNode)
router, err := routers.Get(r.network, r.opts.RouterId).Extract()
if err != nil {
return err
}
routes := router.Routes
for _, item := range routes {
if item.DestinationCIDR == route.DestinationCIDR && item.NextHop == addr {
glog.V(4).Infof("Skipping existing route: %v", route)
return nil
}
}
routes = append(routes, routers.Route{
DestinationCIDR: route.DestinationCIDR,
NextHop: addr,
})
unwind, err := updateRoutes(r.network, router, routes)
if err != nil {
return err
}
defer onFailure.Call(unwind)
// get the port of addr on target node.
portID, err := getPortIDByIP(r.compute, route.TargetNode, addr)
if err != nil {
return err
}
port, err := getPortByID(r.network, portID)
if err != nil {
return err
}
found := false
for _, item := range port.AllowedAddressPairs {
if item.IPAddress == route.DestinationCIDR {
glog.V(4).Info("Found existing allowed-address-pair: ", item)
found = true
break
}
}
if !found {
newPairs := append(port.AllowedAddressPairs, neutronports.AddressPair{
IPAddress: route.DestinationCIDR,
})
unwind, err := updateAllowedAddressPairs(r.network, port, newPairs)
if err != nil {
return err
}
defer onFailure.Call(unwind)
}
glog.V(4).Infof("Route created: %v", route)
onFailure.Disarm()
return nil
}
func (r *Routes) DeleteRoute(clusterName string, route *cloudprovider.Route) error {
glog.V(4).Infof("DeleteRoute(%v, %v)", clusterName, route)
onFailure := NewCaller()
addr, err := getAddressByName(r.compute, route.TargetNode)
if err != nil {
return err
}
router, err := routers.Get(r.network, r.opts.RouterId).Extract()
if err != nil {
return err
}
routes := router.Routes
index := -1
for i, item := range routes {
if item.DestinationCIDR == route.DestinationCIDR && item.NextHop == addr {
index = i
break
}
}
if index == -1 {
glog.V(4).Infof("Skipping non-existent route: %v", route)
return nil
}
// Delete element `index`
routes[index] = routes[len(routes)-1]
routes = routes[:len(routes)-1]
unwind, err := updateRoutes(r.network, router, routes)
if err != nil {
return err
}
defer onFailure.Call(unwind)
// get the port of addr on target node.
portID, err := getPortIDByIP(r.compute, route.TargetNode, addr)
if err != nil {
return err
}
port, err := getPortByID(r.network, portID)
if err != nil {
return err
}
addr_pairs := port.AllowedAddressPairs
index = -1
for i, item := range addr_pairs {
if item.IPAddress == route.DestinationCIDR {
index = i
break
}
}
if index != -1 {
// Delete element `index`
addr_pairs[index] = addr_pairs[len(addr_pairs)-1]
addr_pairs = addr_pairs[:len(addr_pairs)-1]
unwind, err := updateAllowedAddressPairs(r.network, port, addr_pairs)
if err != nil {
return err
}
defer onFailure.Call(unwind)
}
glog.V(4).Infof("Route deleted: %v", route)
onFailure.Disarm()
return nil
}
func getPortIDByIP(compute *gophercloud.ServiceClient, targetNode types.NodeName, ipAddress string) (string, error) {
srv, err := getServerByName(compute, targetNode, true)
if err != nil {
return "", err
}
interfaces, err := getAttachedInterfacesByID(compute, srv.ID)
if err != nil {
return "", err
}
for _, intf := range interfaces {
for _, fixedIP := range intf.FixedIPs {
if fixedIP.IPAddress == ipAddress {
return intf.PortID, nil
}
}
}
return "", ErrNotFound
}
func getPortByID(client *gophercloud.ServiceClient, portID string) (*neutronports.Port, error) {
targetPort, err := neutronports.Get(client, portID).Extract()
if err != nil {
return nil, err
}
if targetPort == nil {
return nil, ErrNotFound
}
return targetPort, nil
}