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/*
* Copyright 2020 Intel Corporation, Inc
*
* 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 nfn
import (
"context"
"fmt"
"ovn4nfv-k8s-plugin/internal/pkg/network"
"ovn4nfv-k8s-plugin/internal/pkg/ovn"
k8sv1alpha1 "ovn4nfv-k8s-plugin/pkg/apis/k8s/v1alpha1"
"strings"
pb "ovn4nfv-k8s-plugin/internal/pkg/nfnNotify/proto"
"github.com/containernetworking/plugins/pkg/ns"
"github.com/docker/docker/client"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"sigs.k8s.io/controller-runtime/pkg/client/config"
logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
)
var log = logf.Log.WithName("chaining")
type RoutingInfo struct {
Name string // Name of the pod
Namespace string // Namespace of the Pod
Id string // Container ID for pod
Node string // Hostname where Pod is scheduled
LeftNetworkRoute k8sv1alpha1.Route // TODO: Update to support multiple networks
RightNetworkRoute k8sv1alpha1.Route // TODO: Update to support multiple networks
DynamicNetworkRoutes []k8sv1alpha1.Route
}
var chainRoutingInfo []RoutingInfo
// Calcuate route to get to left and right edge networks and other networks (not adjacent) in the chain
func calculateDeploymentRoutes(namespace, label string, pos int, num int, ln []k8sv1alpha1.RoutingNetwork, rn []k8sv1alpha1.RoutingNetwork, networkList, deploymentList []string) (r RoutingInfo, err error) {
var nextLeftIP string
var nextRightIP string
r.Namespace = namespace
// Get a config to talk to the apiserver
cfg, err := config.GetConfig()
if err != nil {
return RoutingInfo{}, err
}
var k *kubernetes.Clientset
k, err = kubernetes.NewForConfig(cfg)
if err != nil {
log.Error(err, "Error building Kuberenetes clientset")
return RoutingInfo{}, err
}
lo := v1.ListOptions{LabelSelector: label}
// List the Pods matching the Labels
pods, err := k.CoreV1().Pods(namespace).List(lo)
if err != nil {
log.Error(err, "Deloyment with label not found", "label", label)
return RoutingInfo{}, err
}
// LOADBALANCER NOT YET SUPPORTED - Assuming deployment has only one Pod
if len(pods.Items) <= 0 {
log.Error(err, "Deloyment with label not found", "label", label)
return RoutingInfo{}, fmt.Errorf("Pod not found")
}
// Get the containerID of the first container
r.Id = strings.TrimPrefix(pods.Items[0].Status.ContainerStatuses[0].ContainerID, "docker://")
r.Name = pods.Items[0].GetName()
r.Node = pods.Items[0].Spec.NodeName
// Calcluate IP addresses for next neighbours on both sides
if pos == 0 {
nextLeftIP = ln[0].GatewayIP
} else {
name := strings.Split(deploymentList[pos-1], "=")
nextLeftIP, err = ovn.GetIPAdressForPod(networkList[pos-1], name[1])
if err != nil {
return RoutingInfo{}, err
}
}
if pos == num-1 {
nextRightIP = rn[0].GatewayIP
} else {
name := strings.Split(deploymentList[pos+1], "=")
nextRightIP, err = ovn.GetIPAdressForPod(networkList[pos], name[1])
if err != nil {
return RoutingInfo{}, err
}
}
// Calcuate left right Route to be inserted in Pod
r.LeftNetworkRoute.Dst = ln[0].Subnet
r.LeftNetworkRoute.GW = nextLeftIP
r.RightNetworkRoute.Dst = rn[0].Subnet
r.RightNetworkRoute.GW = nextRightIP
// For each network that is not adjacent add route
for i := 0; i < len(networkList); i++ {
if i == pos || i == pos-1 {
continue
} else {
var rt k8sv1alpha1.Route
rt.Dst, err = ovn.GetNetworkSubnet(networkList[i])
if err != nil {
return RoutingInfo{}, err
}
if i > pos {
rt.GW = nextRightIP
} else {
rt.GW = nextLeftIP
}
r.DynamicNetworkRoutes = append(r.DynamicNetworkRoutes, rt)
}
}
//Add Default Route based on Right Network
rt := k8sv1alpha1.Route{
GW: nextRightIP,
Dst: "0.0.0.0",
}
r.DynamicNetworkRoutes = append(r.DynamicNetworkRoutes, rt)
return
}
func CalculateRoutes(cr *k8sv1alpha1.NetworkChaining) ([]RoutingInfo, error) {
//
var deploymentList []string
var networkList []string
// TODO: Add Validation of Input to this function
ln := cr.Spec.RoutingSpec.LeftNetwork
rn := cr.Spec.RoutingSpec.RightNetwork
chains := strings.Split(cr.Spec.RoutingSpec.NetworkChain, ",")
i := 0
for _, chain := range chains {
if i%2 == 0 {
deploymentList = append(deploymentList, chain)
} else {
networkList = append(networkList, chain)
}
i++
}
num := len(deploymentList)
log.Info("Display the num", "num", num)
log.Info("Display the ln", "ln", ln)
log.Info("Display the rn", "rn", rn)
log.Info("Display the networklist", "networkList", networkList)
log.Info("Display the deploymentlist", "deploymentList", deploymentList)
for i, deployment := range deploymentList {
r, err := calculateDeploymentRoutes(cr.Namespace, deployment, i, num, ln, rn, networkList, deploymentList)
if err != nil {
return nil, err
}
chainRoutingInfo = append(chainRoutingInfo, r)
}
return chainRoutingInfo, nil
}
func ContainerAddRoute(containerPid int, route []*pb.RouteData) error {
str := fmt.Sprintf("/host/proc/%d/ns/net", containerPid)
hostNet, err := network.GetHostNetwork()
if err != nil {
log.Error(err, "Failed to get host network")
return err
}
nms, err := ns.GetNS(str)
if err != nil {
log.Error(err, "Failed namesapce", "containerID", containerPid)
return err
}
defer nms.Close()
err = nms.Do(func(_ ns.NetNS) error {
podGW, err := network.GetDefaultGateway()
if err != nil {
log.Error(err, "Failed to get pod default gateway")
return err
}
stdout, stderr, err := ovn.RunIP("route", "add", hostNet, "via", podGW)
if err != nil && !strings.Contains(stderr, "RTNETLINK answers: File exists") {
log.Error(err, "Failed to ip route add", "stdout", stdout, "stderr", stderr)
return err
}
for _, r := range route {
dst := r.GetDst()
gw := r.GetGw()
// Replace default route
if dst == "0.0.0.0" {
stdout, stderr, err := ovn.RunIP("route", "replace", "default", "via", gw)
if err != nil {
log.Error(err, "Failed to ip route replace", "stdout", stdout, "stderr", stderr)
return err
}
} else {
stdout, stderr, err := ovn.RunIP("route", "add", dst, "via", gw)
if err != nil && !strings.Contains(stderr, "RTNETLINK answers: File exists") {
log.Error(err, "Failed to ip route add", "stdout", stdout, "stderr", stderr)
return err
}
}
}
return nil
})
if err != nil {
log.Error(err, "Failed Netns Do", "containerID", containerPid)
return err
}
return nil
}
func GetPidForContainer(id string) (int, error) {
cli, err := client.NewEnvClient()
if err != nil {
fmt.Println("Unable to create docker client")
return 0, err
}
cli.NegotiateAPIVersion(context.Background())
cj, err := cli.ContainerInspect(context.Background(), id)
if err != nil {
fmt.Println("Unable to Inspect docker container")
return 0, err
}
if cj.State.Pid == 0 {
return 0, fmt.Errorf("Container not found %s", id)
}
return cj.State.Pid, nil
}
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