1 files changed, 290 insertions, 0 deletions
diff --git a/cmd/ovn4nfvk8s-cni/ovn4nfvk8s-cni.go b/cmd/ovn4nfvk8s-cni/ovn4nfvk8s-cni.go
new file mode 100644
index 0000000..923363b
--- /dev/null
+++ b/cmd/ovn4nfvk8s-cni/ovn4nfvk8s-cni.go
@@ -0,0 +1,290 @@
+// +build linux
+
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"net"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/sirupsen/logrus"
+	"github.com/urfave/cli"
+
+	"github.com/containernetworking/cni/pkg/skel"
+	"github.com/containernetworking/cni/pkg/types"
+	"github.com/containernetworking/cni/pkg/types/current"
+	"github.com/containernetworking/cni/pkg/version"
+	"k8s.io/apimachinery/pkg/util/wait"
+
+	kexec "k8s.io/utils/exec"
+	"ovn4nfv-k8s-plugin/internal/pkg/kube"
+
+	"ovn4nfv-k8s-plugin/cmd/ovn4nfvk8s-cni/app"
+	"ovn4nfv-k8s-plugin/internal/pkg/config"
+)
+
+func argString2Map(args string) (map[string]string, error) {
+	argsMap := make(map[string]string)
+
+	pairs := strings.Split(args, ";")
+	for _, pair := range pairs {
+		kv := strings.Split(pair, "=")
+		if len(kv) != 2 {
+			return nil, fmt.Errorf("ARGS: invalid pair %q", pair)
+		}
+		keyString := kv[0]
+		valueString := kv[1]
+		argsMap[keyString] = valueString
+	}
+
+	return argsMap, nil
+}
+
+func parseOvnNetworkObject(ovnnetwork string) ([]map[string]string, error) {
+	var ovnNet []map[string]string
+
+	if ovnnetwork == "" {
+		return nil, fmt.Errorf("parseOvnNetworkObject:error")
+	}
+
+	if err := json.Unmarshal([]byte(ovnnetwork), &ovnNet); err != nil {
+		return nil, fmt.Errorf("parseOvnNetworkObject: failed to load ovn network err: %v | ovn network: %v", err, ovnnetwork)
+	}
+
+	return ovnNet, nil
+}
+
+func mergeWithResult(srcObj, dstObj types.Result) (types.Result, error) {
+
+	if dstObj == nil {
+		return srcObj, nil
+	}
+	src, err := current.NewResultFromResult(srcObj)
+	if err != nil {
+		return nil, fmt.Errorf("Couldn't convert old result to current version: %v", err)
+	}
+	dst, err := current.NewResultFromResult(dstObj)
+	if err != nil {
+		return nil, fmt.Errorf("Couldn't convert old result to current version: %v", err)
+	}
+
+	ifacesLength := len(dst.Interfaces)
+
+	for _, iface := range src.Interfaces {
+		dst.Interfaces = append(dst.Interfaces, iface)
+	}
+	for _, ip := range src.IPs {
+		if ip.Interface != nil && *(ip.Interface) != -1 {
+			ip.Interface = current.Int(*(ip.Interface) + ifacesLength)
+		}
+		dst.IPs = append(dst.IPs, ip)
+	}
+	for _, route := range src.Routes {
+		dst.Routes = append(dst.Routes, route)
+	}
+
+	for _, ns := range src.DNS.Nameservers {
+		dst.DNS.Nameservers = append(dst.DNS.Nameservers, ns)
+	}
+	for _, s := range src.DNS.Search {
+		dst.DNS.Search = append(dst.DNS.Search, s)
+	}
+	for _, opt := range src.DNS.Options {
+		dst.DNS.Options = append(dst.DNS.Options, opt)
+	}
+	// TODO: what about DNS.domain?
+	return dst, nil
+}
+
+func prettyPrint(i interface{}) string {
+	s, _ := json.MarshalIndent(i, "", "\t")
+	return string(s)
+}
+
+func addMultipleInterfaces(args *skel.CmdArgs, ovnAnnotation, namespace, podName string) types.Result {
+	logrus.Infof("ovn4nfvk8s-cni: addMultipleInterfaces ")
+
+	var ovnAnnotatedMap []map[string]string
+	ovnAnnotatedMap, err := parseOvnNetworkObject(ovnAnnotation)
+	if err != nil {
+		logrus.Errorf("addLogicalPort : Error Parsing Ovn Network List %v", ovnAnnotatedMap)
+		return nil
+	}
+	if namespace == "" || podName == "" {
+		logrus.Errorf("required CNI variable missing")
+		return nil
+	}
+	var interfacesArray []*current.Interface
+	var index int
+	var result *current.Result
+	var dstResult types.Result
+	for _, ovnNet := range ovnAnnotatedMap {
+		ipAddress := ovnNet["ip_address"]
+		macAddress := ovnNet["mac_address"]
+		gatewayIP := ovnNet["gateway_ip"]
+		defaultGateway := ovnNet["defaultGateway"]
+
+		if ipAddress == "" || macAddress == "" || gatewayIP == "" {
+			logrus.Errorf("failed in pod annotation key extract")
+			return nil
+		}
+
+		index++
+		interfaceName := ovnNet["interface"]
+		if interfaceName == "" {
+			logrus.Errorf("addMultipleInterfaces: interface can't be null")
+			return nil
+		}
+		logrus.Debugf("addMultipleInterfaces: ipAddress %v %v", ipAddress, interfaceName)
+		interfacesArray, err = app.ConfigureInterface(args, namespace, podName, macAddress, ipAddress, gatewayIP, interfaceName, defaultGateway, config.Default.MTU)
+		if err != nil {
+			logrus.Errorf("Failed to configure interface in pod: %v", err)
+			return nil
+		}
+		addr, addrNet, err := net.ParseCIDR(ipAddress)
+		if err != nil {
+			logrus.Errorf("failed to parse IP address %q: %v", ipAddress, err)
+			return nil
+		}
+		ipVersion := "6"
+		if addr.To4() != nil {
+			ipVersion = "4"
+		}
+		var routes types.Route
+		if defaultGateway == "true" {
+			defaultAddr, defaultAddrNet, _ := net.ParseCIDR("0.0.0.0/0")
+			routes = types.Route{Dst: net.IPNet{IP: defaultAddr, Mask: defaultAddrNet.Mask}, GW: net.ParseIP(gatewayIP)}
+
+			result = &current.Result{
+				Interfaces: interfacesArray,
+				IPs: []*current.IPConfig{
+					{
+						Version:   ipVersion,
+						Interface: current.Int(1),
+						Address:   net.IPNet{IP: addr, Mask: addrNet.Mask},
+						Gateway:   net.ParseIP(gatewayIP),
+					},
+				},
+				Routes: []*types.Route{&routes},
+			}
+		} else {
+			result = &current.Result{
+				Interfaces: interfacesArray,
+				IPs: []*current.IPConfig{
+					{
+						Version:   ipVersion,
+						Interface: current.Int(1),
+						Address:   net.IPNet{IP: addr, Mask: addrNet.Mask},
+						Gateway:   net.ParseIP(gatewayIP),
+					},
+				},
+			}
+
+		}
+		// Build the result structure to pass back to the runtime
+		dstResult, err = mergeWithResult(types.Result(result), dstResult)
+		if err != nil {
+			logrus.Errorf("Failed to merge results: %v", err)
+			return nil
+		}
+	}
+	logrus.Infof("addMultipleInterfaces:  %s", prettyPrint(dstResult))
+	return dstResult
+}
+
+func cmdAdd(args *skel.CmdArgs) error {
+	logrus.Infof("ovn4nfvk8s-cni: cmdAdd ")
+	conf := &types.NetConf{}
+	if err := json.Unmarshal(args.StdinData, conf); err != nil {
+		return fmt.Errorf("failed to load netconf: %v", err)
+	}
+
+	argsMap, err := argString2Map(args.Args)
+	if err != nil {
+		return err
+	}
+
+	namespace := argsMap["K8S_POD_NAMESPACE"]
+	podName := argsMap["K8S_POD_NAME"]
+	if namespace == "" || podName == "" {
+		return fmt.Errorf("required CNI variable missing")
+	}
+
+	clientset, err := config.NewClientset(&config.Kubernetes)
+	if err != nil {
+		return fmt.Errorf("Could not create clientset for kubernetes: %v", err)
+	}
+	kubecli := &kube.Kube{KClient: clientset}
+
+	// Get the IP address and MAC address from the API server.
+	var annotationBackoff = wait.Backoff{Duration: 1 * time.Second, Steps: 14, Factor: 1.5, Jitter: 0.1}
+	var annotation map[string]string
+	if err := wait.ExponentialBackoff(annotationBackoff, func() (bool, error) {
+		annotation, err = kubecli.GetAnnotationsOnPod(namespace, podName)
+		if err != nil {
+			// TODO: check if err is non recoverable
+			logrus.Warningf("Error while obtaining pod annotations - %v", err)
+			return false, nil
+		}
+		if _, ok := annotation["ovnIfaceList"]; ok {
+			return true, nil
+		}
+		return false, nil
+	}); err != nil {
+		return fmt.Errorf("failed to get pod annotation - %v", err)
+	}
+	logrus.Infof("ovn4nfvk8s-cni: Annotation Found ")
+	ovnAnnotation, ok := annotation["ovnIfaceList"]
+	if !ok {
+		return fmt.Errorf("Error while obtaining pod annotations")
+	}
+	result := addMultipleInterfaces(args, ovnAnnotation, namespace, podName)
+	return result.Print()
+}
+
+func cmdDel(args *skel.CmdArgs) error {
+	logrus.Infof("ovn4nfvk8s-cni: cmdDel ")
+	for i := 0; i < 10; i++ {
+		ifaceName := args.ContainerID[:14] + strconv.Itoa(i)
+		done, err := app.PlatformSpecificCleanup(ifaceName)
+		if err != nil {
+			logrus.Errorf("Teardown error: %v", err)
+		}
+		if done {
+			break
+		}
+	}
+	return nil
+}
+
+func main() {
+	logrus.Infof("ovn4nfvk8s-cni CNI Invoked by Multus")
+	c := cli.NewApp()
+	c.Name = "ovn4nfvk8s-cni"
+	c.Usage = "a CNI plugin to set up or tear down a additional interfaces with OVN"
+	c.Version = "0.0.2"
+	c.Flags = config.Flags
+
+	exec := kexec.New()
+	c.Action = func(ctx *cli.Context) error {
+		if _, err := config.InitConfig(ctx, exec, nil); err != nil {
+			return err
+		}
+
+		skel.PluginMain(cmdAdd, cmdDel, version.All)
+		return nil
+	}
+
+	if err := c.Run(os.Args); err != nil {
+		// Print the error to stdout in conformance with the CNI spec
+		e, ok := err.(*types.Error)
+		if !ok {
+			e = &types.Error{Code: 100, Msg: err.Error()}
+		}
+		e.Print()
+	}
+}