Define generic adapter type, rename tunDevice to tunAdapter

src/yggdrasil/icmpv6.go

@@ -24,7 +24,7 @@ type macAddress [6]byte
 const len_ETHER = 14
 
 type icmpv6 struct {
-	tun      *tunDevice
+	tun      *tunAdapter
 	mylladdr net.IP
 	mymac    macAddress
 	peermacs map[address]neighbor
@@ -57,7 +57,7 @@ func ipv6Header_Marshal(h *ipv6.Header) ([]byte, error) {
 // Initialises the ICMPv6 module by assigning our link-local IPv6 address and
 // our MAC address. ICMPv6 messages will always appear to originate from these
 // addresses.
-func (i *icmpv6) init(t *tunDevice) {
+func (i *icmpv6) init(t *tunAdapter) {
 	i.tun = t
 	i.peermacs = make(map[address]neighbor)
 

src/yggdrasil/router.go

@@ -31,7 +31,9 @@ import (
 )
 
 type adapter struct {
-	tunDevice
+	core *Core
+	send chan<- []byte
+	recv <-chan []byte
 }
 
 // The router struct has channels to/from the tun/tap device and a self peer (0), which is how messages are passed between this node and the peers/switch layer.
@@ -43,7 +45,8 @@ type router struct {
 	in        <-chan []byte          // packets we received from the network, link to peer's "out"
 	out       func([]byte)           // packets we're sending to the network, link to peer's "in"
 	toRecv    chan router_recvPacket // packets to handle via recvPacket()
-	tun       tunDevice              // TUN/TAP adapter
+	tun       tunAdapter              // TUN/TAP adapter
+	adapters  []adapter              // Other adapters
 	recv      chan<- []byte          // place where the tun pulls received packets from
 	send      <-chan []byte          // place where the tun puts outgoing packets
 	reset     chan struct{}          // signal that coords changed (re-init sessions/dht)

src/yggdrasil/tun.go

@@ -17,11 +17,9 @@ const tun_IPv6_HEADER_LENGTH = 40
 const tun_ETHER_HEADER_LENGTH = 14
 
 // Represents a running TUN/TAP interface.
-type tunDevice struct {
+type tunAdapter struct {
-	core   *Core
+	adapter
 	icmpv6 icmpv6
-	send   chan<- []byte
-	recv   <-chan []byte
 	mtu    int
 	iface  *water.Interface
 }
@@ -36,7 +34,7 @@ func getSupportedMTU(mtu int) int {
 }
 
 // Initialises the TUN/TAP adapter.
-func (tun *tunDevice) init(core *Core, send chan<- []byte, recv <-chan []byte) {
+func (tun *tunAdapter) init(core *Core, send chan<- []byte, recv <-chan []byte) {
 	tun.core = core
 	tun.icmpv6.init(tun)
 	tun.send = send
@@ -45,7 +43,7 @@ func (tun *tunDevice) init(core *Core, send chan<- []byte, recv <-chan []byte) {
 
 // Starts the setup process for the TUN/TAP adapter, and if successful, starts
 // the read/write goroutines to handle packets on that interface.
-func (tun *tunDevice) start(ifname string, iftapmode bool, addr string, mtu int) error {
+func (tun *tunAdapter) start(ifname string, iftapmode bool, addr string, mtu int) error {
 	if ifname == "none" {
 		return nil
 	}
@@ -77,7 +75,7 @@ func (tun *tunDevice) start(ifname string, iftapmode bool, addr string, mtu int)
 // Writes a packet to the TUN/TAP adapter. If the adapter is running in TAP
 // mode then additional ethernet encapsulation is added for the benefit of the
 // host operating system.
-func (tun *tunDevice) write() error {
+func (tun *tunAdapter) write() error {
 	for {
 		data := <-tun.recv
 		if tun.iface == nil {
@@ -166,7 +164,7 @@ func (tun *tunDevice) write() error {
 // is running in TAP mode then the ethernet headers will automatically be
 // processed and stripped if necessary. If an ICMPv6 packet is found, then
 // the relevant helper functions in icmpv6.go are called.
-func (tun *tunDevice) read() error {
+func (tun *tunAdapter) read() error {
 	mtu := tun.mtu
 	if tun.iface.IsTAP() {
 		mtu += tun_ETHER_HEADER_LENGTH
@@ -203,7 +201,7 @@ func (tun *tunDevice) read() error {
 // Closes the TUN/TAP adapter. This is only usually called when the Yggdrasil
 // process stops. Typically this operation will happen quickly, but on macOS
 // it can block until a read operation is completed.
-func (tun *tunDevice) close() error {
+func (tun *tunAdapter) close() error {
 	if tun.iface == nil {
 		return nil
 	}

src/yggdrasil/tun_bsd.go

@@ -77,7 +77,7 @@ type in6_ifreq_lifetime struct {
 // a system socket and making syscalls to the kernel. This is not refined though
 // and often doesn't work (if at all), therefore if a call fails, it resorts
 // to calling "ifconfig" instead.
-func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int) error {
+func (tun *tunAdapter) setup(ifname string, iftapmode bool, addr string, mtu int) error {
 	var config water.Config
 	if ifname[:4] == "auto" {
 		ifname = "/dev/tap0"
@@ -103,7 +103,7 @@ func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int)
 	return tun.setupAddress(addr)
 }
 
-func (tun *tunDevice) setupAddress(addr string) error {
+func (tun *tunAdapter) setupAddress(addr string) error {
 	var sfd int
 	var err error
 

src/yggdrasil/tun_darwin.go

@@ -14,7 +14,7 @@ import (
 )
 
 // Configures the "utun" adapter with the correct IPv6 address and MTU.
-func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int) error {
+func (tun *tunAdapter) setup(ifname string, iftapmode bool, addr string, mtu int) error {
 	if iftapmode {
 		tun.core.log.Printf("TAP mode is not supported on this platform, defaulting to TUN")
 	}
@@ -62,7 +62,7 @@ type ifreq struct {
 
 // Sets the IPv6 address of the utun adapter. On Darwin/macOS this is done using
 // a system socket and making direct syscalls to the kernel.
-func (tun *tunDevice) setupAddress(addr string) error {
+func (tun *tunAdapter) setupAddress(addr string) error {
 	var fd int
 	var err error
 

src/yggdrasil/tun_linux.go

@@ -13,7 +13,7 @@ import (
 )
 
 // Configures the TAP adapter with the correct IPv6 address and MTU.
-func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int) error {
+func (tun *tunAdapter) setup(ifname string, iftapmode bool, addr string, mtu int) error {
 	var config water.Config
 	if iftapmode {
 		config = water.Config{DeviceType: water.TAP}
@@ -48,7 +48,7 @@ func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int)
 // is used to do this, so there is not a hard requirement on "ip" or "ifconfig"
 // to exist on the system, but this will fail if Netlink is not present in the
 // kernel (it nearly always is).
-func (tun *tunDevice) setupAddress(addr string) error {
+func (tun *tunAdapter) setupAddress(addr string) error {
 	// Set address
 	var netIF *net.Interface
 	ifces, err := net.Interfaces()

src/yggdrasil/tun_other.go

@@ -9,7 +9,7 @@ import water "github.com/yggdrasil-network/water"
 
 // 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 *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int) error {
+func (tun *tunAdapter) setup(ifname string, iftapmode bool, addr string, mtu int) error {
 	var config water.Config
 	if iftapmode {
 		config = water.Config{DeviceType: water.TAP}
@@ -27,7 +27,7 @@ func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int)
 
 // 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 *tunDevice) setupAddress(addr string) error {
+func (tun *tunAdapter) setupAddress(addr string) error {
 	tun.core.log.Println("Platform not supported, you must set the address of", tun.iface.Name(), "to", addr)
 	return nil
 }

src/yggdrasil/tun_windows.go

@@ -13,7 +13,7 @@ import (
 // Configures the TAP adapter with the correct IPv6 address and MTU. On Windows
 // we don't make use of a direct operating system API to do this - we instead
 // delegate the hard work to "netsh".
-func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int) error {
+func (tun *tunAdapter) setup(ifname string, iftapmode bool, addr string, mtu int) error {
 	if !iftapmode {
 		tun.core.log.Printf("TUN mode is not supported on this platform, defaulting to TAP")
 	}
@@ -65,7 +65,7 @@ func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int)
 }
 
 // Sets the MTU of the TAP adapter.
-func (tun *tunDevice) setupMTU(mtu int) error {
+func (tun *tunAdapter) setupMTU(mtu int) error {
 	// Set MTU
 	cmd := exec.Command("netsh", "interface", "ipv6", "set", "subinterface",
 		fmt.Sprintf("interface=%s", tun.iface.Name()),
@@ -82,7 +82,7 @@ func (tun *tunDevice) setupMTU(mtu int) error {
 }
 
 // Sets the IPv6 address of the TAP adapter.
-func (tun *tunDevice) setupAddress(addr string) error {
+func (tun *tunAdapter) setupAddress(addr string) error {
 	// Set address
 	cmd := exec.Command("netsh", "interface", "ipv6", "add", "address",
 		fmt.Sprintf("interface=%s", tun.iface.Name()),