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Drop Water, use Wireguard tun library, drop TAP support

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This commit is contained in:
Neil Alexander 2019-11-22 16:43:50 +00:00
parent 07ce8cde7a
commit f5517acc81
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GPG key ID: A02A2019A2BB0944
20 changed files with 146 additions and 616 deletions
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90
src/tuntap/tun.go
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@ -18,7 +18,7 @@ import (
"github.com/Arceliar/phony"
"github.com/gologme/log"
"github.com/yggdrasil-network/water"
"golang.zx2c4.com/wireguard/tun"
"github.com/yggdrasil-network/yggdrasil-go/src/address"
"github.com/yggdrasil-network/yggdrasil-go/src/config"
@ -28,12 +28,11 @@ import (
)
const tun_IPv6_HEADER_LENGTH = 40
const tun_ETHER_HEADER_LENGTH = 14
// TunAdapter represents a running TUN/TAP interface and extends the
// yggdrasil.Adapter type. In order to use the TUN/TAP adapter with Yggdrasil,
// you should pass this object to the yggdrasil.SetRouterAdapter() function
// before calling yggdrasil.Start().
// TunAdapter represents a running TUN interface and extends the
// yggdrasil.Adapter type. In order to use the TUN adapter with Yggdrasil, you
// should pass this object to the yggdrasil.SetRouterAdapter() function before
// calling yggdrasil.Start().
type TunAdapter struct {
core *yggdrasil.Core
writer tunWriter
@ -48,7 +47,7 @@ type TunAdapter struct {
ckr cryptokey
icmpv6 ICMPv6
mtu int
iface *water.Interface
iface tun.Device
phony.Inbox // Currently only used for _handlePacket from the reader, TODO: all the stuff that currently needs a mutex below
//mutex sync.RWMutex // Protects the below
addrToConn map[address.Address]*tunConn
@ -64,12 +63,12 @@ type TunOptions struct {
// Gets the maximum supported MTU for the platform based on the defaults in
// defaults.GetDefaults().
func getSupportedMTU(mtu int, istapmode bool) int {
func getSupportedMTU(mtu int) int {
if mtu < 1280 {
return 1280
}
if mtu > MaximumMTU(istapmode) {
return MaximumMTU(istapmode)
if mtu > MaximumMTU() {
return MaximumMTU()
}
return mtu
}
@ -77,55 +76,38 @@ func getSupportedMTU(mtu int, istapmode bool) int {
// Name returns the name of the adapter, e.g. "tun0". On Windows, this may
// return a canonical adapter name instead.
func (tun *TunAdapter) Name() string {
return tun.iface.Name()
if name, err := tun.iface.Name(); err == nil {
return name
}
return ""
}
// MTU gets the adapter's MTU. This can range between 1280 and 65535, although
// the maximum value is determined by your platform. The returned value will
// never exceed that of MaximumMTU().
func (tun *TunAdapter) MTU() int {
return getSupportedMTU(tun.mtu, tun.IsTAP())
return getSupportedMTU(tun.mtu)
}
// IsTAP returns true if the adapter is a TAP adapter (Layer 2) or false if it
// is a TUN adapter (Layer 3).
func (tun *TunAdapter) IsTAP() bool {
return tun.iface.IsTAP()
}
// DefaultName gets the default TUN/TAP interface name for your platform.
// DefaultName gets the default TUN interface name for your platform.
func DefaultName() string {
return defaults.GetDefaults().DefaultIfName
}
// DefaultMTU gets the default TUN/TAP interface MTU for your platform. This can
// DefaultMTU gets the default TUN interface MTU for your platform. This can
// be as high as MaximumMTU(), depending on platform, but is never lower than 1280.
func DefaultMTU() int {
ehbytes := 0
if DefaultIsTAP() {
ehbytes = tun_ETHER_HEADER_LENGTH
}
return defaults.GetDefaults().DefaultIfMTU - ehbytes
return defaults.GetDefaults().DefaultIfMTU
}
// DefaultIsTAP returns true if the default adapter mode for the current
// platform is TAP (Layer 2) and returns false for TUN (Layer 3).
func DefaultIsTAP() bool {
return defaults.GetDefaults().DefaultIfTAPMode
}
// MaximumMTU returns the maximum supported TUN/TAP interface MTU for your
// MaximumMTU returns the maximum supported TUN interface MTU for your
// platform. This can be as high as 65535, depending on platform, but is never
// lower than 1280.
func MaximumMTU(iftapmode bool) int {
ehbytes := 0
if iftapmode {
ehbytes = tun_ETHER_HEADER_LENGTH
}
return defaults.GetDefaults().MaximumIfMTU - ehbytes
func MaximumMTU() int {
return defaults.GetDefaults().MaximumIfMTU
}
// Init initialises the TUN/TAP module. You must have acquired a Listener from
// Init initialises the TUN module. You must have acquired a Listener from
// the Yggdrasil core before this point and it must not be in use elsewhere.
func (tun *TunAdapter) Init(core *yggdrasil.Core, config *config.NodeState, log *log.Logger, options interface{}) error {
tunoptions, ok := options.(TunOptions)
@ -145,7 +127,7 @@ func (tun *TunAdapter) Init(core *yggdrasil.Core, config *config.NodeState, log
return nil
}
// Start the setup process for the TUN/TAP adapter. If successful, starts the
// Start the setup process for the TUN adapter. If successful, starts the
// reader actor to handle packets on that interface.
func (tun *TunAdapter) Start() error {
var err error
@ -157,11 +139,11 @@ func (tun *TunAdapter) Start() error {
func (tun *TunAdapter) _start() error {
if tun.isOpen {
return errors.New("TUN/TAP module is already started")
return errors.New("TUN module is already started")
}
current := tun.config.GetCurrent()
if tun.config == nil || tun.listener == nil || tun.dialer == nil {
return errors.New("no configuration available to TUN/TAP")
return errors.New("no configuration available to TUN")
}
var boxPub crypto.BoxPubKey
boxPubHex, err := hex.DecodeString(current.EncryptionPublicKey)
@ -174,23 +156,19 @@ func (tun *TunAdapter) _start() error {
tun.subnet = *address.SubnetForNodeID(nodeID)
addr := fmt.Sprintf("%s/%d", net.IP(tun.addr[:]).String(), 8*len(address.GetPrefix())-1)
if current.IfName == "none" || current.IfName == "dummy" {
tun.log.Debugln("Not starting TUN/TAP as ifname is none or dummy")
tun.log.Debugln("Not starting TUN as ifname is none or dummy")
return nil
}
if err := tun.setup(current.IfName, current.IfTAPMode, addr, current.IfMTU); err != nil {
if err := tun.setup(current.IfName, addr, current.IfMTU); err != nil {
return err
}
if tun.MTU() != current.IfMTU {
tun.log.Warnf("Warning: Interface MTU %d automatically adjusted to %d (supported range is 1280-%d)", current.IfMTU, tun.MTU(), MaximumMTU(tun.IsTAP()))
tun.log.Warnf("Warning: Interface MTU %d automatically adjusted to %d (supported range is 1280-%d)", current.IfMTU, tun.MTU(), MaximumMTU())
}
tun.core.SetMaximumSessionMTU(uint16(tun.MTU()))
tun.isOpen = true
go tun.handler()
tun.reader.Act(nil, tun.reader._read) // Start the reader
tun.icmpv6.Init(tun)
if tun.IsTAP() {
go tun.icmpv6.Solicit(tun.addr)
}
tun.ckr.init(tun)
return nil
}
@ -204,7 +182,7 @@ func (tun *TunAdapter) IsStarted() bool {
return isOpen
}
// Start the setup process for the TUN/TAP adapter. If successful, starts the
// Start the setup process for the TUN adapter. If successful, starts the
// read/write goroutines to handle packets on that interface.
func (tun *TunAdapter) Stop() error {
var err error
@ -216,7 +194,7 @@ func (tun *TunAdapter) Stop() error {
func (tun *TunAdapter) _stop() error {
tun.isOpen = false
// by TUN/TAP, e.g. readers/writers, sessions
// by TUN, e.g. readers/writers, sessions
if tun.iface != nil {
// Just in case we failed to start up the iface for some reason, this can apparently happen on Windows
tun.iface.Close()
@ -224,16 +202,16 @@ func (tun *TunAdapter) _stop() error {
return nil
}
// UpdateConfig updates the TUN/TAP module with the provided config.NodeConfig
// UpdateConfig updates the TUN module with the provided config.NodeConfig
// and then signals the various module goroutines to reconfigure themselves if
// needed.
func (tun *TunAdapter) UpdateConfig(config *config.NodeConfig) {
tun.log.Debugln("Reloading TUN/TAP configuration...")
tun.log.Debugln("Reloading TUN configuration...")
// Replace the active configuration with the supplied one
tun.config.Replace(*config)
// If the MTU has changed in the TUN/TAP module then this is where we would
// If the MTU has changed in the TUN module then this is where we would
// tell the router so that updated session pings can be sent. However, we
// don't currently update the MTU of the adapter once it has been created so
// this doesn't actually happen in the real world yet.
@ -248,14 +226,14 @@ func (tun *TunAdapter) handler() error {
// Accept the incoming connection
conn, err := tun.listener.Accept()
if err != nil {
tun.log.Errorln("TUN/TAP connection accept error:", err)
tun.log.Errorln("TUN connection accept error:", err)
return err
}
phony.Block(tun, func() {
if _, err := tun._wrap(conn.(*yggdrasil.Conn)); err != nil {
// Something went wrong when storing the connection, typically that
// something already exists for this address or subnet
tun.log.Debugln("TUN/TAP handler wrap:", err)
tun.log.Debugln("TUN handler wrap:", err)
}
})
}