/
helpers.go
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/
helpers.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Cilium
package groups
import (
"context"
"fmt"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
cilium_v2 "github.com/cilium/cilium/pkg/k8s/apis/cilium.io/v2"
"github.com/cilium/cilium/pkg/k8s/client"
slimv1 "github.com/cilium/cilium/pkg/k8s/slim/k8s/apis/meta/v1"
"github.com/cilium/cilium/pkg/policy/api"
)
const (
cnpKindName = "derivative"
parentCNP = "io.cilium.network.policy.parent.uuid"
cnpKindKey = "io.cilium.network.policy.kind"
)
func getDerivativeName(obj v1.Object) string {
return obj.GetName() + "-togroups-" + string(obj.GetUID())
}
// createDerivativeCNP will return a new CNP based on the given rule.
func createDerivativeCNP(ctx context.Context, cnp *cilium_v2.CiliumNetworkPolicy) (*cilium_v2.CiliumNetworkPolicy, error) {
// CNP informer may provide a CNP object without APIVersion or Kind.
// Setting manually to make sure that the derivative policy works ok.
derivativeCNP := &cilium_v2.CiliumNetworkPolicy{
ObjectMeta: v1.ObjectMeta{
Name: getDerivativeName(cnp),
Namespace: cnp.ObjectMeta.Namespace,
OwnerReferences: []v1.OwnerReference{{
APIVersion: cilium_v2.SchemeGroupVersion.String(),
Kind: cilium_v2.CNPKindDefinition,
Name: cnp.ObjectMeta.Name,
UID: cnp.ObjectMeta.UID,
}},
Labels: map[string]string{
parentCNP: string(cnp.ObjectMeta.UID),
cnpKindKey: cnpKindName,
},
},
}
var (
rules api.Rules
err error
)
rules, err = cnp.Parse()
if err != nil {
// We return a valid pointer for derivative policy here instead of nil.
// This object is used to get generated name for the derivative policy
// when updating the status of the network policy.
return derivativeCNP, fmt.Errorf("cannot parse CNP: %v", err)
}
derivativeCNP.Specs, err = createAPIRules(ctx, rules)
return derivativeCNP, err
}
// createDerivativeCCNP will return a new CCNP based on the given rule.
func createDerivativeCCNP(ctx context.Context, cnp *cilium_v2.CiliumNetworkPolicy) (*cilium_v2.CiliumClusterwideNetworkPolicy, error) {
ccnp := &cilium_v2.CiliumClusterwideNetworkPolicy{
TypeMeta: cnp.TypeMeta,
ObjectMeta: cnp.ObjectMeta,
Spec: cnp.Spec,
Specs: cnp.Specs,
Status: cnp.Status,
}
// CCNP informer may provide a CCNP object without APIVersion or Kind.
// Setting manually to make sure that the derivative policy works ok.
derivativeCCNP := &cilium_v2.CiliumClusterwideNetworkPolicy{
ObjectMeta: v1.ObjectMeta{
Name: getDerivativeName(ccnp),
Namespace: ccnp.ObjectMeta.Namespace,
OwnerReferences: []v1.OwnerReference{{
APIVersion: cilium_v2.SchemeGroupVersion.String(),
Kind: cilium_v2.CCNPKindDefinition,
Name: ccnp.ObjectMeta.Name,
UID: ccnp.ObjectMeta.UID,
}},
Labels: map[string]string{
parentCNP: string(ccnp.ObjectMeta.UID),
cnpKindKey: cnpKindName,
},
},
}
var (
rules api.Rules
err error
)
rules, err = ccnp.Parse()
if err != nil {
// We return a valid pointer for derivative policy here instead of nil.
// This object is used to get generated name for the derivative policy
// when updating the status of the network policy.
return derivativeCCNP, fmt.Errorf("cannot parse CCNP: %v", err)
}
derivativeCCNP.Specs, err = createAPIRules(ctx, rules)
return derivativeCCNP, err
}
func createAPIRules(ctx context.Context, rules api.Rules) (api.Rules, error) {
specRules := make(api.Rules, len(rules))
for i, rule := range rules {
if rule.RequiresDerivative() {
specRules[i] = denyEgressRule()
}
}
for i, rule := range rules {
if !rule.RequiresDerivative() {
specRules[i] = rule
continue
}
newRule, err := rule.CreateDerivative(ctx)
if err != nil {
return specRules, err
}
specRules[i] = newRule
}
return specRules, nil
}
func denyEgressRule() *api.Rule {
return &api.Rule{
Egress: []api.EgressRule{},
}
}
func updateOrCreateCNP(clientset client.Clientset, cnp *cilium_v2.CiliumNetworkPolicy) (*cilium_v2.CiliumNetworkPolicy, error) {
k8sCNP, err := clientset.CiliumV2().CiliumNetworkPolicies(cnp.ObjectMeta.Namespace).
Get(context.TODO(), cnp.ObjectMeta.Name, v1.GetOptions{})
if err == nil {
k8sCNP.ObjectMeta.Labels = cnp.ObjectMeta.Labels
k8sCNP.Spec = cnp.Spec
k8sCNP.Specs = cnp.Specs
k8sCNP.Status = cilium_v2.CiliumNetworkPolicyStatus{}
return clientset.CiliumV2().CiliumNetworkPolicies(cnp.ObjectMeta.Namespace).Update(context.TODO(), k8sCNP, v1.UpdateOptions{})
}
return clientset.CiliumV2().CiliumNetworkPolicies(cnp.ObjectMeta.Namespace).Create(context.TODO(), cnp, v1.CreateOptions{})
}
func updateOrCreateCCNP(clientset client.Clientset, ccnp *cilium_v2.CiliumClusterwideNetworkPolicy) (*cilium_v2.CiliumClusterwideNetworkPolicy, error) {
k8sCCNP, err := clientset.CiliumV2().CiliumClusterwideNetworkPolicies().
Get(context.TODO(), ccnp.ObjectMeta.Name, v1.GetOptions{})
if err == nil {
k8sCCNP.ObjectMeta.Labels = ccnp.ObjectMeta.Labels
k8sCCNP.Spec = ccnp.Spec
k8sCCNP.Specs = ccnp.Specs
k8sCCNP.Status = cilium_v2.CiliumNetworkPolicyStatus{}
return clientset.CiliumV2().CiliumClusterwideNetworkPolicies().Update(context.TODO(), k8sCCNP, v1.UpdateOptions{})
}
return clientset.CiliumV2().CiliumClusterwideNetworkPolicies().
Create(context.TODO(), ccnp, v1.CreateOptions{})
}
func updateDerivativeStatus(clientset client.Clientset, cnp *cilium_v2.CiliumNetworkPolicy, derivativeName string, err error, clusterScoped bool) error {
status := cilium_v2.CiliumNetworkPolicyNodeStatus{
LastUpdated: slimv1.Now(),
Enforcing: false,
}
if err != nil {
status.OK = false
status.Error = err.Error()
} else {
status.OK = true
}
if clusterScoped {
return updateDerivativeCCNPStatus(clientset, cnp, status, derivativeName)
}
return updateDerivativeCNPStatus(clientset, cnp, status, derivativeName)
}
func updateDerivativeCNPStatus(clientset client.Clientset, cnp *cilium_v2.CiliumNetworkPolicy, status cilium_v2.CiliumNetworkPolicyNodeStatus,
derivativeName string) error {
// This CNP can be modified by cilium agent or operator. To be able to push
// the status correctly fetch the last version to avoid updates issues.
k8sCNP, clientErr := clientset.CiliumV2().CiliumNetworkPolicies(cnp.ObjectMeta.Namespace).
Get(context.TODO(), cnp.ObjectMeta.Name, v1.GetOptions{})
if clientErr != nil {
return fmt.Errorf("cannot get Kubernetes policy: %v", clientErr)
}
if k8sCNP.ObjectMeta.UID != cnp.ObjectMeta.UID {
// This case should not happen, but if the UID does not match make sure
// that the new policy is not in the cache to not loop over it. The
// kubernetes watcher should take care about that.
groupsCNPCache.DeleteCNP(k8sCNP)
return fmt.Errorf("policy UID mismatch")
}
k8sCNP.SetDerivedPolicyStatus(derivativeName, status)
groupsCNPCache.UpdateCNP(k8sCNP)
// TODO: Switch to JSON patch.
_, err := clientset.CiliumV2().CiliumNetworkPolicies(cnp.ObjectMeta.Namespace).
UpdateStatus(context.TODO(), k8sCNP, v1.UpdateOptions{})
return err
}
func updateDerivativeCCNPStatus(clientset client.Clientset, cnp *cilium_v2.CiliumNetworkPolicy, status cilium_v2.CiliumNetworkPolicyNodeStatus,
derivativeName string) error {
k8sCCNP, clientErr := clientset.CiliumV2().CiliumClusterwideNetworkPolicies().
Get(context.TODO(), cnp.ObjectMeta.Name, v1.GetOptions{})
if clientErr != nil {
return fmt.Errorf("cannot get Kubernetes policy: %v", clientErr)
}
if k8sCCNP.ObjectMeta.UID != cnp.ObjectMeta.UID {
// This case should not happen, but if the UID does not match make sure
// that the new policy is not in the cache to not loop over it. The
// kubernetes watcher should take care of that.
groupsCNPCache.DeleteCNP(&cilium_v2.CiliumNetworkPolicy{
ObjectMeta: k8sCCNP.ObjectMeta,
})
return fmt.Errorf("policy UID mismatch")
}
k8sCCNP.SetDerivedPolicyStatus(derivativeName, status)
groupsCNPCache.UpdateCNP(&cilium_v2.CiliumNetworkPolicy{
TypeMeta: k8sCCNP.TypeMeta,
ObjectMeta: k8sCCNP.ObjectMeta,
Spec: k8sCCNP.Spec,
Specs: k8sCCNP.Specs,
Status: k8sCCNP.Status,
})
// TODO: Switch to JSON patch
_, err := clientset.CiliumV2().CiliumClusterwideNetworkPolicies().
UpdateStatus(context.TODO(), k8sCCNP, v1.UpdateOptions{})
return err
}