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envknob,net/tstun,wgengine: use TS_DEBUG_MTU consistently

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Noted on #5915 TS_DEBUG_MTU was not used consistently everywhere.
Extract the default into a function that can apply this centrally and
use it everywhere.

Added envknob.Lookup{Int,Uint}Sized to make it easier to keep CodeQL
happy when using converted values.

Updates #5915

Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker
2023-03-30 10:37:06 -07:00
committed by James Tucker
parent 8ed4fd1dbc
commit 40fa2a420c
7 changed files with 105 additions and 25 deletions
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2
wgengine/router/ifconfig_windows.go
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@ -241,7 +241,7 @@ func interfaceFromLUID(luid winipcfg.LUID, flags winipcfg.GAAFlags) (*winipcfg.I
var networkCategoryWarning = health.NewWarnable(health.WithMapDebugFlag("warn-network-category-unhealthy"))
func configureInterface(cfg *Config, tun *tun.NativeTun) (retErr error) {
const mtu = tstun.DefaultMTU
var mtu = tstun.DefaultMTU()
luid := winipcfg.LUID(tun.LUID())
iface, err := interfaceFromLUID(luid,
// Issue 474: on early boot, when the network is still