Various API changes and simplifications to fix mobile builds

src/tuntap/ckr.go

@@ -59,7 +59,7 @@ func (c *cryptokey) init(tun *TunAdapter) {
 // Configure the CKR routes - this must only ever be called from the router
 // goroutine, e.g. through router.doAdmin
 func (c *cryptokey) configure() error {
-	current, _ := c.tun.config.Get()
+	current := c.tun.config.GetCurrent()
 
 	// Set enabled/disabled state
 	c.setEnabled(current.TunnelRouting.Enable)

src/tuntap/conn.go

@@ -108,10 +108,10 @@ func (s *tunConn) writer() error {
 					} else {
 						s.tun.log.Errorln(s.conn.String(), "TUN/TAP generic write error:", err)
 					}
-				} else if ispackettoobig, maxsize := e.PacketTooBig(); ispackettoobig {
+				} else if e.PacketTooBig() {
 					// TODO: This currently isn't aware of IPv4 for CKR
 					ptb := &icmp.PacketTooBig{
-						MTU:  int(maxsize),
+						MTU:  int(e.PacketMaximumSize()),
 						Data: b[:900],
 					}
 					if packet, err := CreateICMPv6(b[8:24], b[24:40], ipv6.ICMPTypePacketTooBig, 0, ptb); err == nil {

src/tuntap/tun.go

@@ -119,7 +119,7 @@ func (tun *TunAdapter) Init(config *config.NodeState, log *log.Logger, listener
 // Start the setup process for the TUN/TAP adapter. If successful, starts the
 // read/write goroutines to handle packets on that interface.
 func (tun *TunAdapter) Start() error {
-	current, _ := tun.config.Get()
+	current := tun.config.GetCurrent()
 	if tun.config == nil || tun.listener == nil || tun.dialer == nil {
 		return errors.New("No configuration available to TUN/TAP")
 	}

src/tuntap/tun_dummy.go

@@ -1,19 +0,0 @@
-// +build mobile
-
-package tuntap
-
-// This is to catch unsupported platforms
-// If your platform supports tun devices, you could try configuring it manually
-
-// Creates the TUN/TAP adapter, if supported by the Water library. Note that
-// no guarantees are made at this point on an unsupported platform.
-func (tun *TunAdapter) setup(ifname string, iftapmode bool, addr string, mtu int) error {
-	tun.mtu = getSupportedMTU(mtu)
-	return tun.setupAddress(addr)
-}
-
-// We don't know how to set the IPv6 address on an unknown platform, therefore
-// write about it to stdout and don't try to do anything further.
-func (tun *TunAdapter) setupAddress(addr string) error {
-	return nil
-}