device: make new peers inherit broken mobile semantics

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

device/device.go

@@ -44,6 +44,7 @@ type Device struct {
 		netlinkCancel *rwcancel.RWCancel
 		port          uint16 // listening port
 		fwmark        uint32 // mark value (0 = disabled)
+		brokenRoaming bool
 	}
 
 	staticIdentity struct {

device/mobilequirks.go

@@ -5,7 +5,10 @@
 
 package device
 
+// DisableSomeRoamingForBrokenMobileSemantics should ideally be called before peers are created,
+// though it will try to deal with it, and race maybe, if called after.
 func (device *Device) DisableSomeRoamingForBrokenMobileSemantics() {
+	device.net.brokenRoaming = true
 	device.peers.RLock()
 	for _, peer := range device.peers.keyMap {
 		peer.Lock()

device/uapi.go

@@ -261,6 +261,7 @@ func (peer *ipcSetPeer) handlePostConfig() {
 	if peer.Peer == nil {
 		return
 	}
+	peer.disableRoaming = peer.device.net.brokenRoaming && peer.endpoint != nil
 	if !peer.dummy && peer.device.isUp() {
 		peer.Start()
 		if peer.pkaOn {