This commit enables Kilo to work as an independent networking provider. This is done by leveraging CNI. Kilo brings the necessary CNI plugins to operate and takes care of all networking. Add-on compatibility for Calico, Flannel, etc, will be re-introduced shortly.
452 lines
13 KiB
Go
452 lines
13 KiB
Go
// Copyright 2019 the Kilo 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 k8s
|
|
|
|
import (
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"net"
|
|
"path"
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
|
|
crdutils "github.com/ant31/crd-validation/pkg"
|
|
v1 "k8s.io/api/core/v1"
|
|
"k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
|
|
apiextensions "k8s.io/apiextensions-apiserver/pkg/client/clientset/clientset"
|
|
apierrors "k8s.io/apimachinery/pkg/api/errors"
|
|
"k8s.io/apimachinery/pkg/labels"
|
|
"k8s.io/apimachinery/pkg/types"
|
|
"k8s.io/apimachinery/pkg/util/strategicpatch"
|
|
v1informers "k8s.io/client-go/informers/core/v1"
|
|
"k8s.io/client-go/kubernetes"
|
|
v1listers "k8s.io/client-go/listers/core/v1"
|
|
"k8s.io/client-go/tools/cache"
|
|
|
|
"github.com/squat/kilo/pkg/k8s/apis/kilo/v1alpha1"
|
|
kiloclient "github.com/squat/kilo/pkg/k8s/clientset/versioned"
|
|
v1alpha1informers "github.com/squat/kilo/pkg/k8s/informers/kilo/v1alpha1"
|
|
v1alpha1listers "github.com/squat/kilo/pkg/k8s/listers/kilo/v1alpha1"
|
|
"github.com/squat/kilo/pkg/mesh"
|
|
"github.com/squat/kilo/pkg/wireguard"
|
|
)
|
|
|
|
const (
|
|
// Backend is the name of this mesh backend.
|
|
Backend = "kubernetes"
|
|
externalIPAnnotationKey = "kilo.squat.ai/external-ip"
|
|
forceExternalIPAnnotationKey = "kilo.squat.ai/force-external-ip"
|
|
internalIPAnnotationKey = "kilo.squat.ai/internal-ip"
|
|
keyAnnotationKey = "kilo.squat.ai/key"
|
|
lastSeenAnnotationKey = "kilo.squat.ai/last-seen"
|
|
leaderAnnotationKey = "kilo.squat.ai/leader"
|
|
locationAnnotationKey = "kilo.squat.ai/location"
|
|
regionLabelKey = "failure-domain.beta.kubernetes.io/region"
|
|
jsonPatchSlash = "~1"
|
|
jsonRemovePatch = `{"op": "remove", "path": "%s"}`
|
|
)
|
|
|
|
type backend struct {
|
|
nodes *nodeBackend
|
|
peers *peerBackend
|
|
}
|
|
|
|
// Nodes implements the mesh.Backend interface.
|
|
func (b *backend) Nodes() mesh.NodeBackend {
|
|
return b.nodes
|
|
}
|
|
|
|
// Peers implements the mesh.Backend interface.
|
|
func (b *backend) Peers() mesh.PeerBackend {
|
|
return b.peers
|
|
}
|
|
|
|
type nodeBackend struct {
|
|
client kubernetes.Interface
|
|
events chan *mesh.NodeEvent
|
|
informer cache.SharedIndexInformer
|
|
lister v1listers.NodeLister
|
|
}
|
|
|
|
type peerBackend struct {
|
|
client kiloclient.Interface
|
|
extensionsClient apiextensions.Interface
|
|
events chan *mesh.PeerEvent
|
|
informer cache.SharedIndexInformer
|
|
lister v1alpha1listers.PeerLister
|
|
}
|
|
|
|
// New creates a new instance of a mesh.Backend.
|
|
func New(c kubernetes.Interface, kc kiloclient.Interface, ec apiextensions.Interface) mesh.Backend {
|
|
ni := v1informers.NewNodeInformer(c, 5*time.Minute, nil)
|
|
pi := v1alpha1informers.NewPeerInformer(kc, 5*time.Minute, nil)
|
|
|
|
return &backend{
|
|
&nodeBackend{
|
|
client: c,
|
|
events: make(chan *mesh.NodeEvent),
|
|
informer: ni,
|
|
lister: v1listers.NewNodeLister(ni.GetIndexer()),
|
|
},
|
|
&peerBackend{
|
|
client: kc,
|
|
extensionsClient: ec,
|
|
events: make(chan *mesh.PeerEvent),
|
|
informer: pi,
|
|
lister: v1alpha1listers.NewPeerLister(pi.GetIndexer()),
|
|
},
|
|
}
|
|
}
|
|
|
|
// CleanUp removes configuration applied to the backend.
|
|
func (nb *nodeBackend) CleanUp(name string) error {
|
|
patch := []byte("[" + strings.Join([]string{
|
|
fmt.Sprintf(jsonRemovePatch, path.Join("/metadata", "annotations", strings.Replace(externalIPAnnotationKey, "/", jsonPatchSlash, 1))),
|
|
fmt.Sprintf(jsonRemovePatch, path.Join("/metadata", "annotations", strings.Replace(internalIPAnnotationKey, "/", jsonPatchSlash, 1))),
|
|
fmt.Sprintf(jsonRemovePatch, path.Join("/metadata", "annotations", strings.Replace(keyAnnotationKey, "/", jsonPatchSlash, 1))),
|
|
fmt.Sprintf(jsonRemovePatch, path.Join("/metadata", "annotations", strings.Replace(lastSeenAnnotationKey, "/", jsonPatchSlash, 1))),
|
|
}, ",") + "]")
|
|
if _, err := nb.client.CoreV1().Nodes().Patch(name, types.JSONPatchType, patch); err != nil {
|
|
return fmt.Errorf("failed to patch node: %v", err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Get gets a single Node by name.
|
|
func (nb *nodeBackend) Get(name string) (*mesh.Node, error) {
|
|
n, err := nb.lister.Get(name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return translateNode(n), nil
|
|
}
|
|
|
|
// Init initializes the backend; for this backend that means
|
|
// syncing the informer cache.
|
|
func (nb *nodeBackend) Init(stop <-chan struct{}) error {
|
|
go nb.informer.Run(stop)
|
|
if ok := cache.WaitForCacheSync(stop, func() bool {
|
|
return nb.informer.HasSynced()
|
|
}); !ok {
|
|
return errors.New("failed to sync node cache")
|
|
}
|
|
nb.informer.AddEventHandler(
|
|
cache.ResourceEventHandlerFuncs{
|
|
AddFunc: func(obj interface{}) {
|
|
n, ok := obj.(*v1.Node)
|
|
if !ok {
|
|
// Failed to decode Node; ignoring...
|
|
return
|
|
}
|
|
nb.events <- &mesh.NodeEvent{Type: mesh.AddEvent, Node: translateNode(n)}
|
|
},
|
|
UpdateFunc: func(_, obj interface{}) {
|
|
n, ok := obj.(*v1.Node)
|
|
if !ok {
|
|
// Failed to decode Node; ignoring...
|
|
return
|
|
}
|
|
nb.events <- &mesh.NodeEvent{Type: mesh.UpdateEvent, Node: translateNode(n)}
|
|
},
|
|
DeleteFunc: func(obj interface{}) {
|
|
n, ok := obj.(*v1.Node)
|
|
if !ok {
|
|
// Failed to decode Node; ignoring...
|
|
return
|
|
}
|
|
nb.events <- &mesh.NodeEvent{Type: mesh.DeleteEvent, Node: translateNode(n)}
|
|
},
|
|
},
|
|
)
|
|
return nil
|
|
}
|
|
|
|
// List gets all the Nodes in the cluster.
|
|
func (nb *nodeBackend) List() ([]*mesh.Node, error) {
|
|
ns, err := nb.lister.List(labels.Everything())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
nodes := make([]*mesh.Node, len(ns))
|
|
for i := range ns {
|
|
nodes[i] = translateNode(ns[i])
|
|
}
|
|
return nodes, nil
|
|
}
|
|
|
|
// Set sets the fields of a node.
|
|
func (nb *nodeBackend) Set(name string, node *mesh.Node) error {
|
|
old, err := nb.lister.Get(name)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to find node: %v", err)
|
|
}
|
|
n := old.DeepCopy()
|
|
n.ObjectMeta.Annotations[externalIPAnnotationKey] = node.ExternalIP.String()
|
|
n.ObjectMeta.Annotations[internalIPAnnotationKey] = node.InternalIP.String()
|
|
n.ObjectMeta.Annotations[keyAnnotationKey] = string(node.Key)
|
|
n.ObjectMeta.Annotations[lastSeenAnnotationKey] = strconv.FormatInt(node.LastSeen, 10)
|
|
oldData, err := json.Marshal(old)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
newData, err := json.Marshal(n)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
patch, err := strategicpatch.CreateTwoWayMergePatch(oldData, newData, v1.Node{})
|
|
if err != nil {
|
|
return fmt.Errorf("failed to create patch for node %q: %v", n.Name, err)
|
|
}
|
|
if _, err = nb.client.CoreV1().Nodes().Patch(name, types.StrategicMergePatchType, patch); err != nil {
|
|
return fmt.Errorf("failed to patch node: %v", err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Watch returns a chan of node events.
|
|
func (nb *nodeBackend) Watch() <-chan *mesh.NodeEvent {
|
|
return nb.events
|
|
}
|
|
|
|
// translateNode translates a Kubernetes Node to a mesh.Node.
|
|
func translateNode(node *v1.Node) *mesh.Node {
|
|
if node == nil {
|
|
return nil
|
|
}
|
|
_, subnet, err := net.ParseCIDR(node.Spec.PodCIDR)
|
|
// The subnet should only ever fail to parse if the pod CIDR has not been set,
|
|
// so in this case set the subnet to nil and let the node be updated.
|
|
if err != nil {
|
|
subnet = nil
|
|
}
|
|
_, leader := node.ObjectMeta.Annotations[leaderAnnotationKey]
|
|
// Allow the region to be overridden by an explicit location.
|
|
location, ok := node.ObjectMeta.Annotations[locationAnnotationKey]
|
|
if !ok {
|
|
location = node.ObjectMeta.Labels[regionLabelKey]
|
|
}
|
|
// Allow the external IP to be overridden.
|
|
externalIP, ok := node.ObjectMeta.Annotations[forceExternalIPAnnotationKey]
|
|
if !ok {
|
|
externalIP = node.ObjectMeta.Annotations[externalIPAnnotationKey]
|
|
}
|
|
var lastSeen int64
|
|
if ls, ok := node.ObjectMeta.Annotations[lastSeenAnnotationKey]; !ok {
|
|
lastSeen = 0
|
|
} else {
|
|
if lastSeen, err = strconv.ParseInt(ls, 10, 64); err != nil {
|
|
lastSeen = 0
|
|
}
|
|
}
|
|
return &mesh.Node{
|
|
// ExternalIP and InternalIP should only ever fail to parse if the
|
|
// remote node's agent has not yet set its IP address;
|
|
// in this case the IP will be nil and
|
|
// the mesh can wait for the node to be updated.
|
|
ExternalIP: normalizeIP(externalIP),
|
|
InternalIP: normalizeIP(node.ObjectMeta.Annotations[internalIPAnnotationKey]),
|
|
Key: []byte(node.ObjectMeta.Annotations[keyAnnotationKey]),
|
|
LastSeen: lastSeen,
|
|
Leader: leader,
|
|
Location: location,
|
|
Name: node.Name,
|
|
Subnet: subnet,
|
|
}
|
|
}
|
|
|
|
// translatePeer translates a Peer CRD to a mesh.Peer.
|
|
func translatePeer(peer *v1alpha1.Peer) *mesh.Peer {
|
|
if peer == nil {
|
|
return nil
|
|
}
|
|
var aips []*net.IPNet
|
|
for _, aip := range peer.Spec.AllowedIPs {
|
|
aip := normalizeIP(aip)
|
|
// Skip any invalid IPs.
|
|
if aip == nil {
|
|
continue
|
|
}
|
|
aips = append(aips, aip)
|
|
}
|
|
var endpoint *wireguard.Endpoint
|
|
if peer.Spec.Endpoint != nil {
|
|
ip := net.ParseIP(peer.Spec.Endpoint.IP)
|
|
if ip4 := ip.To4(); ip4 != nil {
|
|
ip = ip4
|
|
} else {
|
|
ip = ip.To16()
|
|
}
|
|
if peer.Spec.Endpoint.Port > 0 && ip != nil {
|
|
endpoint = &wireguard.Endpoint{
|
|
IP: ip,
|
|
Port: peer.Spec.Endpoint.Port,
|
|
}
|
|
}
|
|
}
|
|
var key []byte
|
|
if len(peer.Spec.PublicKey) > 0 {
|
|
key = []byte(peer.Spec.PublicKey)
|
|
}
|
|
var pka int
|
|
if peer.Spec.PersistentKeepalive > 0 {
|
|
pka = peer.Spec.PersistentKeepalive
|
|
}
|
|
return &mesh.Peer{
|
|
Name: peer.Name,
|
|
Peer: wireguard.Peer{
|
|
AllowedIPs: aips,
|
|
Endpoint: endpoint,
|
|
PublicKey: key,
|
|
PersistentKeepalive: pka,
|
|
},
|
|
}
|
|
}
|
|
|
|
// CleanUp removes configuration applied to the backend.
|
|
func (pb *peerBackend) CleanUp(name string) error {
|
|
return nil
|
|
}
|
|
|
|
// Get gets a single Peer by name.
|
|
func (pb *peerBackend) Get(name string) (*mesh.Peer, error) {
|
|
p, err := pb.lister.Get(name)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return translatePeer(p), nil
|
|
}
|
|
|
|
// Init initializes the backend; for this backend that means
|
|
// syncing the informer cache.
|
|
func (pb *peerBackend) Init(stop <-chan struct{}) error {
|
|
// Register CRD.
|
|
crd := crdutils.NewCustomResourceDefinition(crdutils.Config{
|
|
SpecDefinitionName: "github.com/squat/kilo/pkg/k8s/apis/kilo/v1alpha1.Peer",
|
|
EnableValidation: true,
|
|
ResourceScope: string(v1beta1.ClusterScoped),
|
|
Group: v1alpha1.GroupName,
|
|
Kind: v1alpha1.PeerKind,
|
|
Version: v1alpha1.SchemeGroupVersion.Version,
|
|
Plural: v1alpha1.PeerPlural,
|
|
ShortNames: v1alpha1.PeerShortNames,
|
|
GetOpenAPIDefinitions: v1alpha1.GetOpenAPIDefinitions,
|
|
})
|
|
crd.Spec.Subresources.Scale = nil
|
|
crd.Spec.Subresources.Status = nil
|
|
|
|
_, err := pb.extensionsClient.ApiextensionsV1beta1().CustomResourceDefinitions().Create(crd)
|
|
if err != nil && !apierrors.IsAlreadyExists(err) {
|
|
return fmt.Errorf("failed to create CRD: %v", err)
|
|
}
|
|
|
|
go pb.informer.Run(stop)
|
|
if ok := cache.WaitForCacheSync(stop, func() bool {
|
|
return pb.informer.HasSynced()
|
|
}); !ok {
|
|
return errors.New("failed to sync peer cache")
|
|
}
|
|
pb.informer.AddEventHandler(
|
|
cache.ResourceEventHandlerFuncs{
|
|
AddFunc: func(obj interface{}) {
|
|
p, ok := obj.(*v1alpha1.Peer)
|
|
if !ok || p.Validate() != nil {
|
|
// Failed to decode Peer; ignoring...
|
|
return
|
|
}
|
|
pb.events <- &mesh.PeerEvent{Type: mesh.AddEvent, Peer: translatePeer(p)}
|
|
},
|
|
UpdateFunc: func(_, obj interface{}) {
|
|
p, ok := obj.(*v1alpha1.Peer)
|
|
if !ok || p.Validate() != nil {
|
|
// Failed to decode Peer; ignoring...
|
|
return
|
|
}
|
|
pb.events <- &mesh.PeerEvent{Type: mesh.UpdateEvent, Peer: translatePeer(p)}
|
|
},
|
|
DeleteFunc: func(obj interface{}) {
|
|
p, ok := obj.(*v1alpha1.Peer)
|
|
if !ok || p.Validate() != nil {
|
|
// Failed to decode Peer; ignoring...
|
|
return
|
|
}
|
|
pb.events <- &mesh.PeerEvent{Type: mesh.DeleteEvent, Peer: translatePeer(p)}
|
|
},
|
|
},
|
|
)
|
|
return nil
|
|
}
|
|
|
|
// List gets all the Peers in the cluster.
|
|
func (pb *peerBackend) List() ([]*mesh.Peer, error) {
|
|
ps, err := pb.lister.List(labels.Everything())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
peers := make([]*mesh.Peer, len(ps))
|
|
for i := range ps {
|
|
// Skip invalid peers.
|
|
if ps[i].Validate() != nil {
|
|
continue
|
|
}
|
|
peers[i] = translatePeer(ps[i])
|
|
}
|
|
return peers, nil
|
|
}
|
|
|
|
// Set sets the fields of a peer.
|
|
func (pb *peerBackend) Set(name string, peer *mesh.Peer) error {
|
|
old, err := pb.lister.Get(name)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to find peer: %v", err)
|
|
}
|
|
p := old.DeepCopy()
|
|
p.Spec.AllowedIPs = make([]string, len(peer.AllowedIPs))
|
|
for i := range peer.AllowedIPs {
|
|
p.Spec.AllowedIPs[i] = peer.AllowedIPs[i].String()
|
|
}
|
|
if peer.Endpoint != nil {
|
|
p.Spec.Endpoint = &v1alpha1.PeerEndpoint{
|
|
IP: peer.Endpoint.IP.String(),
|
|
Port: peer.Endpoint.Port,
|
|
}
|
|
}
|
|
p.Spec.PersistentKeepalive = peer.PersistentKeepalive
|
|
p.Spec.PublicKey = string(peer.PublicKey)
|
|
if _, err = pb.client.KiloV1alpha1().Peers().Update(p); err != nil {
|
|
return fmt.Errorf("failed to update peer: %v", err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Watch returns a chan of peer events.
|
|
func (pb *peerBackend) Watch() <-chan *mesh.PeerEvent {
|
|
return pb.events
|
|
}
|
|
|
|
func normalizeIP(ip string) *net.IPNet {
|
|
i, ipNet, err := net.ParseCIDR(ip)
|
|
if err != nil || ipNet == nil {
|
|
return nil
|
|
}
|
|
if ip4 := i.To4(); ip4 != nil {
|
|
ipNet.IP = ip4
|
|
return ipNet
|
|
}
|
|
ipNet.IP = i.To16()
|
|
return ipNet
|
|
}
|