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Merge pull request networkservicemesh#465 from rejmond/issue-464
Add routerlocalnet server chain element
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| // Copyright (c) 2022 Xored Software Inc and others. | ||
| // | ||
| // 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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| //go:build linux | ||
| // +build linux | ||
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| // Package routelocalnet provides chain element that enables route_localnet flat for connection network interface | ||
| package routelocalnet | ||
|
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "os" | ||
|
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| "github.com/golang/protobuf/ptypes/empty" | ||
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| "github.com/networkservicemesh/api/pkg/api/networkservice" | ||
| "github.com/networkservicemesh/api/pkg/api/networkservice/mechanisms/kernel" | ||
| "github.com/networkservicemesh/sdk/pkg/networkservice/core/next" | ||
| ) | ||
|
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| type routeLocalNetServer struct { | ||
| } | ||
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| // NewServer - returns a new networkservice.NetworkServiceServer that writes route_localnet flag | ||
| // for network interface on Request if enabled in mechanism | ||
| func NewServer() networkservice.NetworkServiceServer { | ||
| return &routeLocalNetServer{} | ||
| } | ||
|
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| func (s *routeLocalNetServer) Request(ctx context.Context, request *networkservice.NetworkServiceRequest) (*networkservice.Connection, error) { | ||
| conn, err := next.Server(ctx).Request(ctx, request) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
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| mechanism := kernel.ToMechanism(request.GetConnection().GetMechanism()) | ||
| if mechanism != nil && mechanism.GetRouteLocalNet() { | ||
| fo, err := os.Create(fmt.Sprintf("/proc/sys/net/ipv4/conf/%s/route_localnet", mechanism.GetInterfaceName())) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| defer func() { _ = fo.Close() }() | ||
|
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| _, err = fo.WriteString("1") | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
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| return conn, nil | ||
| } | ||
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| func (s *routeLocalNetServer) Close(ctx context.Context, conn *networkservice.Connection) (*empty.Empty, error) { | ||
| return next.Server(ctx).Close(ctx, conn) | ||
| } |