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control,tailcfg,wgengine/magicsock: add nodeAttr to enable/disable peer MTU

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Add a nodeAttr to enable/disable peer path MTU discovery.

Updates #311

Signed-off-by: Val <valerie@tailscale.com>
This commit is contained in:
Val
2023-09-21 11:31:48 +02:00
committed by valscale
parent 95635857dc
commit 65dc711c76
4 changed files with 102 additions and 0 deletions
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6
control/controlknobs/controlknobs.go
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@@ -45,6 +45,9 @@ type Knobs struct {
// incremental (delta) netmap updates and should treat all netmap
// changes as "full" ones as tailscaled did in 1.48.x and earlier.
DisableDeltaUpdates atomic.Bool
// PeerMTUEnable is whether the node should do peer path MTU discovery.
PeerMTUEnable atomic.Bool
}
// UpdateFromNodeAttributes updates k (if non-nil) based on the provided self
@@ -65,6 +68,7 @@ func (k *Knobs) UpdateFromNodeAttributes(selfNodeAttrs []tailcfg.NodeCapability,
disableDeltaUpdates = has(tailcfg.NodeAttrDisableDeltaUpdates)
oneCGNAT opt.Bool
forceBackgroundSTUN = has(tailcfg.NodeAttrDebugForceBackgroundSTUN)
peerMTUEnable = has(tailcfg.NodeAttrPeerMTUEnable)
)
if has(tailcfg.NodeAttrOneCGNATEnable) {
@@ -80,6 +84,7 @@ func (k *Knobs) UpdateFromNodeAttributes(selfNodeAttrs []tailcfg.NodeCapability,
k.OneCGNAT.Store(oneCGNAT)
k.ForceBackgroundSTUN.Store(forceBackgroundSTUN)
k.DisableDeltaUpdates.Store(disableDeltaUpdates)
k.PeerMTUEnable.Store(peerMTUEnable)
}
// AsDebugJSON returns k as something that can be marshalled with json.Marshal
@@ -96,5 +101,6 @@ func (k *Knobs) AsDebugJSON() map[string]any {
"OneCGNAT": k.OneCGNAT.Load(),
"ForceBackgroundSTUN": k.ForceBackgroundSTUN.Load(),
"DisableDeltaUpdates": k.DisableDeltaUpdates.Load(),
"PeerMTUEnable": k.PeerMTUEnable.Load(),
}
}