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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/controlclient/direct.go
View File

@ -1302,6 +1302,7 @@ func (ms *mapSession) setControlKnobsFromNodeAttrs(selfNodeAttrs []string) {
disableUPnP bool
randomizeClientPort bool
oneCGNAT opt.Bool
forceBackgroundSTUN bool
)
for _, attr := range selfNodeAttrs {
switch attr {
@ -1317,6 +1318,8 @@ func (ms *mapSession) setControlKnobsFromNodeAttrs(selfNodeAttrs []string) {
oneCGNAT.Set(true)
case tailcfg.NodeAttrOneCGNATDisable:
oneCGNAT.Set(false)
case tailcfg.NodeAttrDebugForceBackgroundSTUN:
forceBackgroundSTUN = true
}
}
k.KeepFullWGConfig.Store(keepFullWG)
@ -1324,6 +1327,7 @@ func (ms *mapSession) setControlKnobsFromNodeAttrs(selfNodeAttrs []string) {
k.DisableUPnP.Store(disableUPnP)
k.RandomizeClientPort.Store(randomizeClientPort)
k.OneCGNAT.Store(oneCGNAT)
k.ForceBackgroundSTUN.Store(forceBackgroundSTUN)
}
// ipForwardingBroken reports whether the system's IP forwarding is disabled

4
control/controlknobs/controlknobs.go
View File

@ -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
}

4
wgengine/magicsock/magicsock.go
View File

@ -51,7 +51,6 @@
"tailscale.com/types/logger"
"tailscale.com/types/netmap"
"tailscale.com/types/nettype"
"tailscale.com/types/views"
"tailscale.com/util/clientmetric"
"tailscale.com/util/mak"
"tailscale.com/util/ringbuffer"
@ -2151,8 +2150,7 @@ func (c *Conn) shouldDoPeriodicReSTUNLocked() bool {
c.logf("magicsock: periodicReSTUN: idle for %v", idleFor.Round(time.Second))
}
if idleFor > sessionActiveTimeout {
if c.netMap != nil && c.netMap.SelfNode.Valid() &&
views.SliceContains(c.netMap.SelfNode.Capabilities(), tailcfg.NodeAttrDebugForceBackgroundSTUN) {
if c.controlKnobs != nil && c.controlKnobs.ForceBackgroundSTUN.Load() {
// Overridden by control.
return true
}