Delete tap interfaces on startup

pkg/networkservice/chains/forwarder/server.go

@@ -63,6 +63,7 @@ import (
 	"github.com/networkservicemesh/sdk-vpp/pkg/networkservice/tag"
 	"github.com/networkservicemesh/sdk-vpp/pkg/networkservice/up"
 	"github.com/networkservicemesh/sdk-vpp/pkg/networkservice/xconnect"
+	"github.com/networkservicemesh/sdk-vpp/pkg/tools/dumptool"
 )
 
 // Connection aggregates the api.Connection and api.ChannelProvider interfaces
@@ -87,6 +88,12 @@ func NewServer(ctx context.Context, tokenGenerator token.GeneratorFunc, vppConn
 	for _, opt := range options {
 		opt(opts)
 	}
+
+	// Create a function, that will dump NSM interfaces and apply to them onDump func
+	dumper := func(onDump dumptool.OnDumpFn, isClient bool) error {
+		return dumptool.DumpVppInterfaces(ctx, vppConn, opts.name, isClient, onDump)
+	}
+
 	nseClient := registryclient.NewNetworkServiceEndpointRegistryClient(ctx, opts.clientURL,
 		registryclient.WithNSEAdditionalFunctionality(
 			registryrecvfd.NewNetworkServiceEndpointRegistryClient(),
@@ -113,7 +120,7 @@ func NewServer(ctx context.Context, tokenGenerator token.GeneratorFunc, vppConn
 			memif.MECHANISM: memif.NewServer(ctx, vppConn,
 				memif.WithDirectMemif(),
 				memif.WithChangeNetNS()),
-			kernel.MECHANISM:    kernel.NewServer(vppConn),
+			kernel.MECHANISM:    kernel.NewServer(vppConn, kernel.WithDump(dumper)),
 			vxlan.MECHANISM:     vxlan.NewServer(vppConn, tunnelIP, opts.vxlanOpts...),
 			wireguard.MECHANISM: wireguard.NewServer(vppConn, tunnelIP),
 		}),
@@ -136,7 +143,7 @@ func NewServer(ctx context.Context, tokenGenerator token.GeneratorFunc, vppConn
 					memif.NewClient(vppConn,
 						memif.WithChangeNetNS(),
 					),
-					kernel.NewClient(vppConn),
+					kernel.NewClient(vppConn, kernel.WithDump(dumper)),
 					vxlan.NewClient(vppConn, tunnelIP, opts.vxlanOpts...),
 					wireguard.NewClient(vppConn, tunnelIP),
 					vlan.NewClient(vppConn, opts.domain2Device),

pkg/networkservice/mechanisms/kernel/client.go

@@ -1,4 +1,4 @@
-// Copyright (c) 2020-2021 Cisco and/or its affiliates.
+// Copyright (c) 2020-2022 Cisco and/or its affiliates.
 //
 // SPDX-License-Identifier: Apache-2.0
 //
@@ -30,9 +30,14 @@ import (
 )
 
 // NewClient - returns a new Client chain element implementing the kernel mechanism with vpp
-func NewClient(vppConn api.Connection) networkservice.NetworkServiceClient {
+func NewClient(vppConn api.Connection, opts ...Option) networkservice.NetworkServiceClient {
+	o := &options{}
+	for _, opt := range opts {
+		opt(o)
+	}
+
 	if _, err := os.Stat(vnetFilename); err == nil {
-		return kerneltap.NewClient(vppConn)
+		return kerneltap.NewClient(vppConn, kerneltap.WithDump(o.dump))
 	}
 	return kernelvethpair.NewClient(vppConn)
 }

pkg/networkservice/mechanisms/kernel/kerneltap/client.go

@@ -1,4 +1,4 @@
-// Copyright (c) 2020-2021 Cisco and/or its affiliates.
+// Copyright (c) 2020-2022 Cisco and/or its affiliates.
 //
 // SPDX-License-Identifier: Apache-2.0
 //
@@ -39,7 +39,18 @@ type kernelTapClient struct {
 }
 
 // NewClient - return a new Client chain element implementing the kernel mechanism with vpp using tapv2
-func NewClient(vppConn api.Connection) networkservice.NetworkServiceClient {
+func NewClient(vppConn api.Connection, opts ...Option) networkservice.NetworkServiceClient {
+	o := &options{}
+	for _, opt := range opts {
+		opt(o)
+	}
+
+	if o.dump != nil {
+		if err := o.dump(onDump, false); err != nil {
+			log.FromContext(context.Background()).Error(err)
+		}
+	}
+
 	return &kernelTapClient{
 		vppConn: vppConn,
 	}

pkg/networkservice/mechanisms/kernel/kerneltap/common.go

@@ -147,18 +147,29 @@ func del(ctx context.Context, conn *networkservice.Connection, vppConn api.Conne
 		if !ok {
 			return nil
 		}
-		now := time.Now()
-		_, err := tapv2.NewServiceClient(vppConn).TapDeleteV2(ctx, &tapv2.TapDeleteV2{
-			SwIfIndex: swIfIndex,
-		})
-		if err != nil {
-			return errors.Wrapf(err, "unable to delete connection with SwIfIndex %v", swIfIndex)
-		}
-		log.FromContext(ctx).
-			WithField("SwIfIndex", swIfIndex).
-			WithField("duration", time.Since(now)).
-			WithField("vppapi", "TapDeleteV2").Debug("completed")
-		return nil
+		return delVpp(ctx, vppConn, swIfIndex)
+	}
+	return nil
+}
+
+func delVpp(ctx context.Context, vppConn api.Connection, swIfIndex interface_types.InterfaceIndex) error {
+	now := time.Now()
+	_, err := tapv2.NewServiceClient(vppConn).TapDeleteV2(ctx, &tapv2.TapDeleteV2{
+		SwIfIndex: swIfIndex,
+	})
+	if err != nil {
+		return errors.Wrapf(err, "unable to delete connection with SwIfIndex %v", swIfIndex)
+	}
+	log.FromContext(ctx).
+		WithField("SwIfIndex", swIfIndex).
+		WithField("duration", time.Since(now)).
+		WithField("vppapi", "TapDeleteV2").Debug("completed")
+	return nil
+}
+
+func onDump(ctx context.Context, vppConn api.Connection, details *interfaces.SwInterfaceDetails) error {
+	if details.InterfaceDevType == DevTypeTap {
+		return delVpp(ctx, vppConn, details.SwIfIndex)
 	}
 	return nil
 }

pkg/networkservice/mechanisms/kernel/kerneltap/constants.go

@@ -1,4 +1,4 @@
-// Copyright (c) 2020 Cisco and/or its affiliates.
+// Copyright (c) 2020-2022 Cisco and/or its affiliates.
 //
 // SPDX-License-Identifier: Apache-2.0
 //
@@ -21,4 +21,7 @@ import "github.com/networkservicemesh/api/pkg/api/networkservice/mechanisms/kern
 const (
 	// MECHANISM string
 	MECHANISM = kernel.MECHANISM
+
+	// DevTypeTap - tap interface dev type
+	DevTypeTap = "virtio"
 )

pkg/networkservice/mechanisms/kernel/kerneltap/options.go

@@ -0,0 +1,35 @@
+// Copyright (c) 2022 Cisco and/or its affiliates.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// 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.
+
+// +build linux
+
+package kerneltap
+
+import "github.com/networkservicemesh/sdk-vpp/pkg/tools/dumptool"
+
+type options struct {
+	dump dumptool.DumpNSMFn
+}
+
+// Option is an option pattern for kernel
+type Option func(o *options)
+
+// WithDump - sets dump parameters
+func WithDump(dump dumptool.DumpNSMFn) Option {
+	return func(o *options) {
+		o.dump = dump
+	}
+}

pkg/networkservice/mechanisms/kernel/kerneltap/server.go

@@ -1,4 +1,4 @@
-// Copyright (c) 2020-2021 Cisco and/or its affiliates.
+// Copyright (c) 2020-2022 Cisco and/or its affiliates.
 //
 // SPDX-License-Identifier: Apache-2.0
 //
@@ -37,7 +37,18 @@ type kernelTapServer struct {
 }
 
 // NewServer - return a new Server chain element implementing the kernel mechanism with vpp using tapv2
-func NewServer(vppConn api.Connection) networkservice.NetworkServiceServer {
+func NewServer(vppConn api.Connection, opts ...Option) networkservice.NetworkServiceServer {
+	o := &options{}
+	for _, opt := range opts {
+		opt(o)
+	}
+
+	if o.dump != nil {
+		if err := o.dump(onDump, true); err != nil {
+			log.FromContext(context.Background()).Error(err)
+		}
+	}
+
 	return &kernelTapServer{
 		vppConn: vppConn,
 	}

pkg/networkservice/mechanisms/kernel/options.go

@@ -0,0 +1,35 @@
+// Copyright (c) 2022 Cisco and/or its affiliates.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// 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.
+
+// +build linux
+
+package kernel
+
+import "github.com/networkservicemesh/sdk-vpp/pkg/tools/dumptool"
+
+type options struct {
+	dump dumptool.DumpNSMFn
+}
+
+// Option is an option pattern for kernel
+type Option func(o *options)
+
+// WithDump - sets dump parameters
+func WithDump(dump dumptool.DumpNSMFn) Option {
+	return func(o *options) {
+		o.dump = dump
+	}
+}

pkg/networkservice/mechanisms/kernel/server.go

@@ -1,4 +1,4 @@
-// Copyright (c) 2020-2021 Cisco and/or its affiliates.
+// Copyright (c) 2020-2022 Cisco and/or its affiliates.
 //
 // SPDX-License-Identifier: Apache-2.0
 //
@@ -30,9 +30,14 @@ import (
 )
 
 // NewServer return a NetworkServiceServer chain element that correctly handles the kernel Mechanism
-func NewServer(vppConn api.Connection) networkservice.NetworkServiceServer {
+func NewServer(vppConn api.Connection, opts ...Option) networkservice.NetworkServiceServer {
+	o := &options{}
+	for _, opt := range opts {
+		opt(o)
+	}
+
 	if _, err := os.Stat(vnetFilename); err == nil {
-		return kerneltap.NewServer(vppConn)
+		return kerneltap.NewServer(vppConn, kerneltap.WithDump(o.dump))
 	}
 	return kernelvethpair.NewServer(vppConn)
 }

pkg/networkservice/tag/common.go

@@ -27,6 +27,7 @@ import (
 	"github.com/pkg/errors"
 
 	"github.com/networkservicemesh/sdk-vpp/pkg/tools/ifindex"
+	"github.com/networkservicemesh/sdk-vpp/pkg/tools/tagtool"
 )
 
 func create(ctx context.Context, conn *networkservice.Connection, vppConn api.Connection, isClient bool) error {
@@ -36,16 +37,21 @@ func create(ctx context.Context, conn *networkservice.Connection, vppConn api.Co
 	}
 
 	now := time.Now()
+	tag := tagtool.ConvertToString(&tagtool.Tag{
+		TagPrefix: conn.Path.PathSegments[conn.Path.Index].Name,
+		ConnID:    conn.GetId(),
+		IsClient:  isClient,
+	})
 	if _, err := interfaces.NewServiceClient(vppConn).SwInterfaceTagAddDel(ctx, &interfaces.SwInterfaceTagAddDel{
 		IsAdd:     true,
 		SwIfIndex: swIfIndex,
-		Tag:       conn.GetId(),
+		Tag:       tag,
 	}); err != nil {
 		return errors.WithStack(err)
 	}
 	log.FromContext(ctx).
 		WithField("swIfIndex", swIfIndex).
-		WithField("tag", conn.GetId()).
+		WithField("tag", tag).
 		WithField("duration", time.Since(now)).
 		WithField("vppapi", "SwInterfaceTagAddDel").Debug("completed")
 	return nil

pkg/tools/dumptool/dumptool.go

@@ -0,0 +1,66 @@
+// Copyright (c) 2022 Cisco and/or its affiliates.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// 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 dumptool provides utilities for vpp interfaces dump
+package dumptool
+
+import (
+	"context"
+	"io"
+
+	"git.fd.io/govpp.git/api"
+	interfaces "github.com/edwarnicke/govpp/binapi/interface"
+	"github.com/networkservicemesh/sdk/pkg/tools/log"
+	"github.com/pkg/errors"
+
+	"github.com/networkservicemesh/sdk-vpp/pkg/tools/tagtool"
+)
+
+// DumpNSMFn - dumps NSM interfaces applies onDump func for each of them
+type DumpNSMFn func(onDump OnDumpFn, isClient bool) error
+
+// OnDumpFn - action with dumped NSM interfaces
+type OnDumpFn func(ctx context.Context, vppConn api.Connection, details *interfaces.SwInterfaceDetails) error
+
+// DumpVppInterfaces - dumps vpp interfaces by tag.
+//	- onDump - determines what to do if we found an NSM interface during the dump
+func DumpVppInterfaces(ctx context.Context, vppConn api.Connection, tagPrefix string, isClient bool, onDump OnDumpFn) error {
+	client, err := interfaces.NewServiceClient(vppConn).SwInterfaceDump(ctx, &interfaces.SwInterfaceDump{})
+	if err != nil {
+		return errors.Wrap(err, "SwInterfaceDump error")
+	}
+	defer func() { _ = client.Close() }()
+
+	for {
+		details, err := client.Recv()
+		if err == io.EOF || details == nil {
+			break
+		}
+
+		t, err := tagtool.ConvertFromString(details.Tag)
+		if err != nil {
+			continue
+		}
+		if t.TagPrefix != tagPrefix || t.IsClient != isClient {
+			continue
+		}
+
+		if err := onDump(ctx, vppConn, details); err != nil {
+			log.FromContext(ctx).Error(err)
+		}
+	}
+	return nil
+}