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wgengine/magicsock: debug knob to override preferred derp region

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Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited 2023-12-11 17:18:06 -08:00
parent 2f529d7120
commit 682d9ea896
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GPG Key ID: 33DF352F65991EB8
3 changed files with 7 additions and 1 deletions
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1
wgengine/magicsock/debugknobs.go
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@ -56,6 +56,7 @@
debugEnablePMTUD = envknob.RegisterOptBool("TS_DEBUG_ENABLE_PMTUD") debugEnablePMTUD = envknob.RegisterOptBool("TS_DEBUG_ENABLE_PMTUD")
// debugPMTUD prints extra debugging about peer MTU path discovery. // debugPMTUD prints extra debugging about peer MTU path discovery.
debugPMTUD = envknob.RegisterBool("TS_DEBUG_PMTUD") debugPMTUD = envknob.RegisterBool("TS_DEBUG_PMTUD")
debugPreferDERPRegion = envknob.RegisterInt("TS_DEBUG_PREFER_DERP_REGION")
// Hey you! Adding a new debugknob? Make sure to stub it out in the // Hey you! Adding a new debugknob? Make sure to stub it out in the
// debugknobs_stubs.go file too. // debugknobs_stubs.go file too.
) )

1
wgengine/magicsock/debugknobs_stubs.go
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@ -28,3 +28,4 @@ func debugEnablePMTUD() opt.Bool { return "" }
func debugRingBufferMaxSizeBytes() int { return 0 } func debugRingBufferMaxSizeBytes() int { return 0 }
func inTest() bool { return false } func inTest() bool { return false }
func debugPeerMap() bool { return false } func debugPeerMap() bool { return false }
func debugPreferDERPRegion() int { return 0 }

4
wgengine/magicsock/magicsock.go
View File

@ -649,6 +649,10 @@ func (c *Conn) updateNetInfo(ctx context.Context) (*netcheck.Report, error) {
ni.WorkingUDP.Set(report.UDP) ni.WorkingUDP.Set(report.UDP)
ni.WorkingICMPv4.Set(report.ICMPv4) ni.WorkingICMPv4.Set(report.ICMPv4)
ni.PreferredDERP = report.PreferredDERP ni.PreferredDERP = report.PreferredDERP
preferDERP := debugPreferDERPRegion()
if preferDERP > 0 {
ni.PreferredDERP = preferDERP
}
if ni.PreferredDERP == 0 { if ni.PreferredDERP == 0 {
// Perhaps UDP is blocked. Pick a deterministic but arbitrary // Perhaps UDP is blocked. Pick a deterministic but arbitrary