Implement network namespacing

Signed-off-by: apostasie <spam_blackhole@farcloser.world>
containerd · Jun 16, 2024 · f2976ab · f2976ab
1 parent 2d74381
commit f2976ab
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Showing 12 changed files with 30 additions and 14 deletions.
diff --git a/cmd/nerdctl/completion.go b/cmd/nerdctl/completion.go
@@ -109,7 +109,7 @@ func shellCompleteNetworkNames(cmd *cobra.Command, exclude []string) ([]string,
 		excludeMap[ex] = struct{}{}
 	}
 
-	e, err := netutil.NewCNIEnv(globalOptions.CNIPath, globalOptions.CNINetConfPath)
+	e, err := netutil.NewCNIEnv(globalOptions.CNIPath, globalOptions.CNINetConfPath, netutil.WithNamespace(globalOptions.Namespace))
 	if err != nil {
 		return nil, cobra.ShellCompDirectiveError
 	}

diff --git a/pkg/cmd/compose/compose.go b/pkg/cmd/compose/compose.go
@@ -41,7 +41,7 @@ import (
 
 // New returns a new *composer.Composer.
 func New(client *containerd.Client, globalOptions types.GlobalCommandOptions, options composer.Options, stdout, stderr io.Writer) (*composer.Composer, error) {
-	cniEnv, err := netutil.NewCNIEnv(globalOptions.CNIPath, globalOptions.CNINetConfPath, netutil.WithDefaultNetwork())
+	cniEnv, err := netutil.NewCNIEnv(globalOptions.CNIPath, globalOptions.CNINetConfPath, netutil.WithNamespace(globalOptions.Namespace), netutil.WithDefaultNetwork())
 	if err != nil {
 		return nil, err
 	}

diff --git a/pkg/cmd/container/kill.go b/pkg/cmd/container/kill.go
@@ -152,7 +152,7 @@ func cleanupNetwork(ctx context.Context, container containerd.Container, globalO
 		case nettype.Host, nettype.None, nettype.Container:
 			// NOP
 		case nettype.CNI:
-			e, err := netutil.NewCNIEnv(globalOpts.CNIPath, globalOpts.CNINetConfPath, netutil.WithDefaultNetwork())
+			e, err := netutil.NewCNIEnv(globalOpts.CNIPath, globalOpts.CNINetConfPath, netutil.WithNamespace(globalOpts.Namespace), netutil.WithDefaultNetwork())
 			if err != nil {
 				return err
 			}

diff --git a/pkg/cmd/network/create.go b/pkg/cmd/network/create.go
@@ -33,7 +33,7 @@ func Create(options types.NetworkCreateOptions, stdout io.Writer) error {
 		options.Subnets = []string{""}
 	}
 
-	e, err := netutil.NewCNIEnv(options.GOptions.CNIPath, options.GOptions.CNINetConfPath)
+	e, err := netutil.NewCNIEnv(options.GOptions.CNIPath, options.GOptions.CNINetConfPath, netutil.WithNamespace(options.GOptions.Namespace))
 	if err != nil {
 		return err
 	}

diff --git a/pkg/cmd/network/inspect.go b/pkg/cmd/network/inspect.go
@@ -32,7 +32,7 @@ import (
 
 func Inspect(ctx context.Context, options types.NetworkInspectOptions) error {
 	globalOptions := options.GOptions
-	e, err := netutil.NewCNIEnv(globalOptions.CNIPath, globalOptions.CNINetConfPath)
+	e, err := netutil.NewCNIEnv(globalOptions.CNIPath, globalOptions.CNINetConfPath, netutil.WithNamespace(options.GOptions.Namespace))
 
 	if err != nil {
 		return err

diff --git a/pkg/cmd/network/list.go b/pkg/cmd/network/list.go
@@ -65,7 +65,7 @@ func List(ctx context.Context, options types.NetworkListOptions) error {
 		}
 	}
 
-	e, err := netutil.NewCNIEnv(globalOptions.CNIPath, globalOptions.CNINetConfPath)
+	e, err := netutil.NewCNIEnv(globalOptions.CNIPath, globalOptions.CNINetConfPath, netutil.WithNamespace(options.GOptions.Namespace))
 	if err != nil {
 		return err
 	}

diff --git a/pkg/cmd/network/prune.go b/pkg/cmd/network/prune.go
@@ -28,7 +28,7 @@ import (
 )
 
 func Prune(ctx context.Context, client *containerd.Client, options types.NetworkPruneOptions) error {
-	e, err := netutil.NewCNIEnv(options.GOptions.CNIPath, options.GOptions.CNINetConfPath)
+	e, err := netutil.NewCNIEnv(options.GOptions.CNIPath, options.GOptions.CNINetConfPath, netutil.WithNamespace(options.GOptions.Namespace))
 	if err != nil {
 		return err
 	}

diff --git a/pkg/cmd/network/remove.go b/pkg/cmd/network/remove.go
@@ -27,7 +27,7 @@ import (
 )
 
 func Remove(ctx context.Context, client *containerd.Client, options types.NetworkRemoveOptions) error {
-	e, err := netutil.NewCNIEnv(options.GOptions.CNIPath, options.GOptions.CNINetConfPath)
+	e, err := netutil.NewCNIEnv(options.GOptions.CNIPath, options.GOptions.CNINetConfPath, netutil.WithNamespace(options.GOptions.Namespace))
 	if err != nil {
 		return err
 	}

diff --git a/pkg/containerutil/container_network_manager_linux.go b/pkg/containerutil/container_network_manager_linux.go
@@ -39,7 +39,7 @@ type cniNetworkManagerPlatform struct {
 
 // Verifies that the internal network settings are correct.
 func (m *cniNetworkManager) VerifyNetworkOptions(_ context.Context) error {
-	e, err := netutil.NewCNIEnv(m.globalOptions.CNIPath, m.globalOptions.CNINetConfPath, netutil.WithDefaultNetwork())
+	e, err := netutil.NewCNIEnv(m.globalOptions.CNIPath, m.globalOptions.CNINetConfPath, netutil.WithNamespace(m.globalOptions.Namespace), netutil.WithDefaultNetwork())
 	if err != nil {
 		return err
 	}

diff --git a/pkg/containerutil/container_network_manager_windows.go b/pkg/containerutil/container_network_manager_windows.go
@@ -36,7 +36,7 @@ type cniNetworkManagerPlatform struct {
 
 // Verifies that the internal network settings are correct.
 func (m *cniNetworkManager) VerifyNetworkOptions(_ context.Context) error {
-	e, err := netutil.NewCNIEnv(m.globalOptions.CNIPath, m.globalOptions.CNINetConfPath, netutil.WithDefaultNetwork())
+	e, err := netutil.NewCNIEnv(m.globalOptions.CNIPath, m.globalOptions.CNINetConfPath, netutil.WithNamespace(m.globalOptions.Namespace), netutil.WithDefaultNetwork())
 	if err != nil {
 		return err
 	}
@@ -67,7 +67,7 @@ func (m *cniNetworkManager) VerifyNetworkOptions(_ context.Context) error {
 }
 
 func (m *cniNetworkManager) getCNI() (gocni.CNI, error) {
-	e, err := netutil.NewCNIEnv(m.globalOptions.CNIPath, m.globalOptions.CNINetConfPath, netutil.WithDefaultNetwork())
+	e, err := netutil.NewCNIEnv(m.globalOptions.CNIPath, m.globalOptions.CNINetConfPath, netutil.WithNamespace(m.globalOptions.Namespace), netutil.WithDefaultNetwork())
 	if err != nil {
 		return nil, fmt.Errorf("failed to instantiate CNI env: %s", err)
 	}

diff --git a/pkg/netutil/netutil.go b/pkg/netutil/netutil.go
@@ -46,6 +46,7 @@ import (
 type CNIEnv struct {
 	Path        string
 	NetconfPath string
+	Namespace   string
 }
 
 type CNIEnvOpt func(e *CNIEnv) error
@@ -132,6 +133,16 @@ func WithDefaultNetwork() CNIEnvOpt {
 	}
 }
 
+func WithNamespace(namespace string) CNIEnvOpt {
+	return func(e *CNIEnv) error {
+		if err := os.MkdirAll(filepath.Join(e.NetconfPath, namespace), 0755); err != nil {
+			return err
+		}
+		e.Namespace = namespace
+		return nil
+	}
+}
+
 func NewCNIEnv(cniPath, cniConfPath string, opts ...CNIEnvOpt) (*CNIEnv, error) {
 	e := CNIEnv{
 		Path:        cniPath,
@@ -193,7 +204,7 @@ func (e *CNIEnv) FilterNetworks(filterf func(*NetworkConfig) bool) ([]*NetworkCo
 }
 
 func (e *CNIEnv) getConfigPathForNetworkName(netName string) string {
-	return filepath.Join(e.NetconfPath, "nerdctl-"+netName+".conflist")
+	return filepath.Join(e.NetconfPath, e.Namespace, "nerdctl-"+netName+".conflist")
 }
 
 func (e *CNIEnv) usedSubnets() ([]*net.IPNet, error) {
@@ -404,10 +415,15 @@ func (e *CNIEnv) writeNetworkConfig(net *NetworkConfig) error {
 // networkConfigList loads config from dir if dir exists.
 func (e *CNIEnv) networkConfigList() ([]*NetworkConfig, error) {
 	l := []*NetworkConfig{}
-	fileNames, err := libcni.ConfFiles(e.NetconfPath, []string{".conf", ".conflist", ".json"})
+	common, err := libcni.ConfFiles(e.NetconfPath, []string{".conf", ".conflist", ".json"})
+	if err != nil {
+		return nil, err
+	}
+	namespaced, err := libcni.ConfFiles(filepath.Join(e.NetconfPath, e.Namespace), []string{".conf", ".conflist", ".json"})
 	if err != nil {
 		return nil, err
 	}
+	fileNames := append(common, namespaced...)
 	sort.Strings(fileNames)
 	for _, fileName := range fileNames {
 		var lcl *libcni.NetworkConfigList

diff --git a/pkg/ocihook/ocihook.go b/pkg/ocihook/ocihook.go
@@ -152,7 +152,7 @@ func newHandlerOpts(state *specs.State, dataStore, cniPath, cniNetconfPath strin
 	case nettype.Host, nettype.None, nettype.Container:
 		// NOP
 	case nettype.CNI:
-		e, err := netutil.NewCNIEnv(cniPath, cniNetconfPath, netutil.WithDefaultNetwork())
+		e, err := netutil.NewCNIEnv(cniPath, cniNetconfPath, netutil.WithNamespace(namespace), netutil.WithDefaultNetwork())
 		if err != nil {
 			return nil, err
 		}