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wgengine/magicsock: add TS_DEBUG_NEVER_DIRECT_UDP debug knob (#17094)

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Updates tailscale/corp#30903

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited 2025-09-10 16:48:40 -07:00 committed by GitHub
parent 32bfd72752
commit fb9d9ba86e
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3 changed files with 7 additions and 0 deletions
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3
wgengine/magicsock/debugknobs.go
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@ -62,6 +62,9 @@ var (
// //
//lint:ignore U1000 used on Linux/Darwin only //lint:ignore U1000 used on Linux/Darwin only
debugPMTUD = envknob.RegisterBool("TS_DEBUG_PMTUD") debugPMTUD = envknob.RegisterBool("TS_DEBUG_PMTUD")
// debugNeverDirectUDP disables the use of direct UDP connections, forcing
// all peer communication over DERP or peer relay.
debugNeverDirectUDP = envknob.RegisterBool("TS_DEBUG_NEVER_DIRECT_UDP")
// 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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@ -31,3 +31,4 @@ 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 pretendpoints() []netip.AddrPort { return []netip.AddrPort{} } func pretendpoints() []netip.AddrPort { return []netip.AddrPort{} }
func debugNeverDirectUDP() bool { return false }

3
wgengine/magicsock/endpoint.go
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@ -1286,6 +1286,9 @@ func (de *endpoint) startDiscoPingLocked(ep epAddr, now mono.Time, purpose disco
if runtime.GOOS == "js" { if runtime.GOOS == "js" {
return return
} }
if debugNeverDirectUDP() && !ep.vni.IsSet() && ep.ap.Addr() != tailcfg.DerpMagicIPAddr {
return
}
epDisco := de.disco.Load() epDisco := de.disco.Load()
if epDisco == nil { if epDisco == nil {
return return