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[vlan multiplexing] add vlan tag for vlan supported kernel mechanism (#…
…1088) * add vlan tag for vlan supported kernel mechanism Signed-off-by: Periyasamy Palanisamy <[email protected]> * use options closure to set vlan id range Signed-off-by: Periyasamy Palanisamy <[email protected]> * Revert "use options closure to set vlan id range" This reverts commit cf8d38b. Signed-off-by: Periyasamy Palanisamy <[email protected]> * Revert "add vlan tag for vlan supported kernel mechanism" This reverts commit 1d6415f. Signed-off-by: Periyasamy Palanisamy <[email protected]> * add vlan server chain element Signed-off-by: Periyasamy Palanisamy <[email protected]>
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85
pkg/networkservice/common/mechanisms/kernel/vlan/server.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| // Copyright (c) 2021 Nordix Foundation. | ||
| // | ||
| // 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. | ||
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| // +build linux | ||
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| // Package vlan provides server chain element setting vlan id on the kernel mechanism | ||
| package vlan | ||
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| import ( | ||
| "context" | ||
| "errors" | ||
| "sync" | ||
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| "github.com/RoaringBitmap/roaring" | ||
| "github.com/golang/protobuf/ptypes/empty" | ||
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| "github.com/networkservicemesh/api/pkg/api/networkservice" | ||
| kernelmech "github.com/networkservicemesh/api/pkg/api/networkservice/mechanisms/kernel" | ||
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| "github.com/networkservicemesh/sdk/pkg/networkservice/core/next" | ||
| ) | ||
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| type vlanServer struct { | ||
| freeVLANs *roaring.Bitmap | ||
| lock sync.Mutex | ||
| } | ||
|
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| // NewServer - creates a NetworkServiceServer that requests a kernel interface with vlan parameter | ||
| func NewServer() networkservice.NetworkServiceServer { | ||
| vlans := roaring.New() | ||
| vlans.AddRange(1, 4095) | ||
| return &vlanServer{ | ||
| freeVLANs: vlans, | ||
| } | ||
| } | ||
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| func (m *vlanServer) Request(ctx context.Context, request *networkservice.NetworkServiceRequest) (*networkservice.Connection, error) { | ||
| mechanism := kernelmech.ToMechanism(request.GetConnection().GetMechanism()) | ||
| isEstablished := true | ||
| if mechanism != nil && mechanism.SupportsVLAN() && mechanism.GetVLAN() == 0 { | ||
| m.lock.Lock() | ||
| if m.freeVLANs.IsEmpty() { | ||
| m.lock.Unlock() | ||
| return nil, errors.New("vlan id not available for allocation") | ||
| } | ||
| vlanID := m.freeVLANs.Minimum() | ||
| m.freeVLANs.Remove(vlanID) | ||
| m.lock.Unlock() | ||
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| mechanism.SetVLAN(vlanID) | ||
| isEstablished = false | ||
| } | ||
| conn, err := next.Server(ctx).Request(ctx, request) | ||
| if err != nil && mechanism != nil && !isEstablished { | ||
| m.releaseVLANID(mechanism) | ||
| } | ||
| return conn, err | ||
| } | ||
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| func (m *vlanServer) Close(ctx context.Context, conn *networkservice.Connection) (*empty.Empty, error) { | ||
| mechanism := kernelmech.ToMechanism(conn.GetMechanism()) | ||
| if mechanism != nil && mechanism.SupportsVLAN() && mechanism.GetVLAN() > 0 { | ||
| m.releaseVLANID(mechanism) | ||
| } | ||
| return next.Server(ctx).Close(ctx, conn) | ||
| } | ||
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| func (m *vlanServer) releaseVLANID(mechanism *kernelmech.Mechanism) { | ||
| m.lock.Lock() | ||
| defer m.lock.Unlock() | ||
| m.freeVLANs.Add(mechanism.GetVLAN()) | ||
| } |