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wgengine/magicsock: don't change DERP home when not connected to control

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This pretty much always results in an outage because peers won't
discover our new home region and thus won't be able to establish
connectivity.

Updates tailscale/corp#18095

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: Ic0d09133f198b528dd40c6383b16d7663d9d37a7
This commit is contained in:
Andrew Dunham
2024-03-08 12:32:15 -05:00
parent 54e52532eb
commit f072d017bd
3 changed files with 172 additions and 11 deletions
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11
wgengine/magicsock/magicsock.go
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@@ -682,16 +682,7 @@ func (c *Conn) updateNetInfo(ctx context.Context) (*netcheck.Report, error) {
ni.OSHasIPv6.Set(report.OSHasIPv6)
ni.WorkingUDP.Set(report.UDP)
ni.WorkingICMPv4.Set(report.ICMPv4)
ni.PreferredDERP = report.PreferredDERP
if ni.PreferredDERP == 0 {
// Perhaps UDP is blocked. Pick a deterministic but arbitrary
// one.
ni.PreferredDERP = c.pickDERPFallback()
}
if !c.setNearestDERP(ni.PreferredDERP) {
ni.PreferredDERP = 0
}
ni.PreferredDERP = c.maybeSetNearestDERP(report)
ni.FirewallMode = hostinfo.FirewallMode()
c.callNetInfoCallback(ni)