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control/controlknobs,tailcfg,wgengine/magicsock: remove DRPO shutoff switch

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The DERP Return Path Optimization (DRPO) is over four years old (and
on by default for over two) and we haven't had problems, so time to
remove the emergency shutoff code (controlknob) which we've never
used. The controlknobs are only meant for new features, to mitigate
risk. But we don't want to keep them forever, as they kinda pollute
the code.

Updates #150

Change-Id: If021bc8fd1b51006d8bddd1ffab639bb1abb0ad1
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-07-06 19:29:58 -07:00
committed by Brad Fitzpatrick
parent 9df107f4f0
commit d2fef01206
5 changed files with 9 additions and 37 deletions
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tailcfg/tailcfg.go
-4
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@@ -2203,10 +2203,6 @@ const (
// always giving WireGuard the full netmap, even for idle peers.
NodeAttrDebugDisableWGTrim NodeCapability = "debug-no-wg-trim"
// NodeAttrDebugDisableDRPO disables the DERP Return Path Optimization.
// See Issue 150.
NodeAttrDebugDisableDRPO NodeCapability = "debug-disable-drpo"
// NodeAttrDisableSubnetsIfPAC controls whether subnet routers should be
// disabled if WPAD is present on the network.
NodeAttrDisableSubnetsIfPAC NodeCapability = "debug-disable-subnets-if-pac"