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all: use network less when running in v86 emulator

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Updates #5794

Change-Id: I1d8b005a1696835c9062545f87b7bab643cfc44d
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2025-04-01 04:01:00 -07:00
committed by Brad Fitzpatrick
parent 29c2bb1db6
commit 65c7a37bc6
6 changed files with 104 additions and 6 deletions
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9
control/controlclient/direct.go
View File

@@ -1086,7 +1086,7 @@ func (c *Direct) sendMapRequest(ctx context.Context, isStreaming bool, nu Netmap
} else {
vlogf("netmap: got new map")
}
if resp.ControlDialPlan != nil {
if resp.ControlDialPlan != nil && !ignoreDialPlan() {
if c.dialPlan != nil {
c.logf("netmap: got new dial plan from control")
c.dialPlan.Store(resp.ControlDialPlan)
@@ -1774,6 +1774,13 @@ func makeScreenTimeDetectingDialFunc(dial dialFunc) (dialFunc, *atomic.Bool) {
}, ab
}
func ignoreDialPlan() bool {
// If we're running in v86 (a JavaScript-based emulation of a 32-bit x86)
// our networking is very limited. Let's ignore the dial plan since it's too
// complicated to race that many IPs anyway.
return hostinfo.IsInVM86()
}
func isTCPLoopback(a net.Addr) bool {
if ta, ok := a.(*net.TCPAddr); ok {
return ta.IP.IsLoopback()

26
control/controlclient/map.go
View File

@@ -19,6 +19,7 @@ import (
"tailscale.com/control/controlknobs"
"tailscale.com/envknob"
"tailscale.com/hostinfo"
"tailscale.com/tailcfg"
"tailscale.com/tstime"
"tailscale.com/types/key"
@@ -308,6 +309,31 @@ func (ms *mapSession) updateStateFromResponse(resp *tailcfg.MapResponse) {
}
}
// In the copy/v86 wasm environment with limited networking, if the
// control plane didn't pick our DERP home for us, do it ourselves and
// mark all but the lowest region as NoMeasureNoHome. For prod, this
// will be Region 1, NYC, a compromise between the US and Europe. But
// really the control plane should pick this. This is only a fallback.
if hostinfo.IsInVM86() {
numCanMeasure := 0
lowest := 0
for rid, r := range dm.Regions {
if !r.NoMeasureNoHome {
numCanMeasure++
if lowest == 0 || rid < lowest {
lowest = rid
}
}
}
if numCanMeasure > 1 {
for rid, r := range dm.Regions {
if rid != lowest {
r.NoMeasureNoHome = true
}
}
}
}
// Zero-valued fields in a DERPMap mean that we're not changing
// anything and are using the previous value(s).
if ldm := ms.lastDERPMap; ldm != nil {