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wgengine/magicsock: make debugNeverDirectUDP influence remote peer decisions

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By dropping inbound disco.Ping messages received over direct UDP paths.

Fixes #18560

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited
2026-01-29 15:41:55 -08:00
committed by Jordan Whited
parent 3ce13eb2b9
commit 3b6d542923
2 changed files with 6 additions and 1 deletions
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wgengine/magicsock/debugknobs.go
+2 -1
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@@ -62,7 +62,8 @@ var (
//
//lint:ignore U1000 used on Linux/Darwin only
debugPMTUD = envknob.RegisterBool("TS_DEBUG_PMTUD")
// debugNeverDirectUDP disables the use of direct UDP connections, forcing
// debugNeverDirectUDP disables the use of direct UDP connections by
// suppressing/dropping inbound/outbound [disco.Ping] messages, 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