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control/controlknobs: move ForceBackgroundSTUN to controlknobs.Knobs

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This is both more efficient (because the knobs' bool is only updated
whenever Node is changed, rarely) and also gets us one step closer to
removing a case of storing a netmap.NetworkMap in
magicsock. (eventually we want to phase out much of the use of that
type internally)

Updates #1909

Change-Id: I37e81789f94133175064fdc09984e4f3a431f1a1
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2023-09-11 17:53:21 -07:00
committed by Brad Fitzpatrick
parent 4e91cf20a8
commit 42072683d6
3 changed files with 9 additions and 3 deletions
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4
control/controlknobs/controlknobs.go
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@@ -34,4 +34,8 @@ type Knobs struct {
// OneCGNAT is whether the the node should make one big CGNAT route
// in the OS rather than one /32 per peer.
OneCGNAT syncs.AtomicValue[opt.Bool]
// ForceBackgroundSTUN forces netcheck STUN queries to keep
// running in magicsock, even when idle.
ForceBackgroundSTUN atomic.Bool
}