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ipn/ipnlocal: resolve exit node IP to ID at EditPrefs time.

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Without this, enabling an exit node immediately blackholes all traffic,
but doesn't correctly let it flow to the exit node until the next netmap
update.

Fixes #3447

Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson 2021-12-01 15:33:14 -08:00 committed by Brad Fitzpatrick
parent 8775c646be
commit 44d0c1ab06
1 changed files with 10 additions and 1 deletions
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11
ipn/ipnlocal/local.go
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@ -620,6 +620,11 @@ func (b *LocalBackend) setClientStatus(st controlclient.Status) {
// findExitNodeIDLocked updates b.prefs to reference an exit node by ID,
// rather than by IP. It returns whether prefs was mutated.
func (b *LocalBackend) findExitNodeIDLocked(nm *netmap.NetworkMap) (prefsChanged bool) {
if nm == nil {
// No netmap, can't resolve anything.
return false
}
// If we have a desired IP on file, try to find the corresponding
// node.
if b.prefs.ExitNodeIP.IsZero() {
@ -1688,7 +1693,7 @@ func (b *LocalBackend) SetPrefs(newp *ipn.Prefs) {
}
// setPrefsLockedOnEntry requires b.mu be held to call it, but it
// unlocks b.mu when done.
// unlocks b.mu when done. newp ownership passes to this function.
func (b *LocalBackend) setPrefsLockedOnEntry(caller string, newp *ipn.Prefs) {
netMap := b.netMap
stateKey := b.stateKey
@ -1696,6 +1701,10 @@ func (b *LocalBackend) setPrefsLockedOnEntry(caller string, newp *ipn.Prefs) {
oldp := b.prefs
newp.Persist = oldp.Persist // caller isn't allowed to override this
b.prefs = newp
// findExitNodeIDLocked returns whether it updated b.prefs, but
// everything in this function treats b.prefs as completely new
// anyway. No-op if no exit node resolution is needed.
b.findExitNodeIDLocked(netMap)
b.inServerMode = newp.ForceDaemon
// We do this to avoid holding the lock while doing everything else.
newp = b.prefs.Clone()