/
bfd.go
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/
bfd.go
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// Copyright 2020 Anapaya Systems
//
// 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 control
import (
"fmt"
"os"
"strconv"
"time"
"github.com/scionproto/scion/private/topology"
)
const (
envDisable = "SCION_EXPERIMENTAL_BFD_DISABLE"
envMult = "SCION_EXPERIMENTAL_BFD_DETECT_MULT"
envMinTx = "SCION_EXPERIMENTAL_BFD_DESIRED_MIN_TX"
envMinRx = "SCION_EXPERIMENTAL_BFD_REQUIRED_MIN_RX"
)
// BFD is the configuration for the BFD sessions.
type BFD topology.BFD
// XXX(sgmonroy) note that env values only affect defaults, which in turn are only used
// if there were no BFD related settings in the topology.
func WithDefaults(cfg BFD) BFD {
// If default is disable, BFD is globally disabled.
if BFDDefaults.Disable {
cfg.Disable = true
}
if cfg.DetectMult == 0 {
cfg.DetectMult = BFDDefaults.DetectMult
}
if cfg.DesiredMinTxInterval == 0 {
cfg.DesiredMinTxInterval = BFDDefaults.DesiredMinTxInterval
}
if cfg.RequiredMinRxInterval == 0 {
cfg.RequiredMinRxInterval = BFDDefaults.RequiredMinRxInterval
}
return cfg
}
var (
BFDDefaults = BFD{
DetectMult: 3,
DesiredMinTxInterval: 200 * time.Millisecond,
RequiredMinRxInterval: 200 * time.Millisecond,
// Disable indicates if BFD is disabled globally.
Disable: false,
}
)
func init() {
if val := os.Getenv(envDisable); val != "" {
if disabled, err := strconv.ParseBool(val); err == nil {
BFDDefaults.Disable = disabled
fmt.Fprintf(os.Stderr, "%s=%v\n", envDisable, disabled)
} else {
fmt.Fprintf(os.Stderr, "Error parsing %s: %v\n", envDisable, err)
}
}
if val := os.Getenv(envMult); val != "" {
if p, err := strconv.ParseUint(val, 10, 8); err == nil {
BFDDefaults.DetectMult = uint8(p)
fmt.Fprintf(os.Stderr, "%s=%v\n", envMult, BFDDefaults.DetectMult)
} else {
fmt.Fprintf(os.Stderr, "Error parsing %s: %v\n", envMult, err)
}
}
if val := os.Getenv(envMinTx); val != "" {
if d, err := time.ParseDuration(val); err == nil {
BFDDefaults.DesiredMinTxInterval = d
fmt.Fprintf(os.Stderr, "%s=%v\n", envMinTx, BFDDefaults.DesiredMinTxInterval)
} else {
fmt.Fprintf(os.Stderr, "Error parsing %s: %v\n", envMinTx, err)
}
}
if val := os.Getenv(envMinRx); val != "" {
if d, err := time.ParseDuration(val); err == nil {
BFDDefaults.RequiredMinRxInterval = d
fmt.Fprintf(os.Stderr, "%s=%v\n", envMinRx, BFDDefaults.RequiredMinRxInterval)
} else {
fmt.Fprintf(os.Stderr, "Error parsing %s: %v\n", envMinRx, err)
}
}
}