mirror of
https://github.com/yggdrasil-network/yggdrasil-go.git
synced 2025-04-28 22:25:07 +03:00
Rename tuntap package to tun
We haven't had TAP support in ages.
This commit is contained in:
Neil Alexander
parent
217ac39e77
commit
01c44a087b
18 changed files with 31 additions and 36 deletions
45
src/tun/admin.go
Normal file
45
src/tun/admin.go
Normal file
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@ -0,0 +1,45 @@
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package tun
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import (
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"encoding/json"
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"github.com/yggdrasil-network/yggdrasil-go/src/admin"
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)
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type GetTUNRequest struct{}
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type GetTUNResponse struct {
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Enabled bool `json:"enabled"`
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Name string `json:"name,omitempty"`
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MTU uint64 `json:"mtu,omitempty"`
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}
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type TUNEntry struct {
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MTU uint64 `json:"mtu"`
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}
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func (t *TunAdapter) getTUNHandler(req *GetTUNRequest, res *GetTUNResponse) error {
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res.Enabled = t.isEnabled
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if !t.isEnabled {
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return nil
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}
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res.Name = t.Name()
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res.MTU = t.MTU()
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return nil
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}
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func (t *TunAdapter) SetupAdminHandlers(a *admin.AdminSocket) {
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_ = a.AddHandler(
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"getTun", "Show information about the node's TUN interface", []string{},
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func(in json.RawMessage) (interface{}, error) {
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req := &GetTUNRequest{}
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res := &GetTUNResponse{}
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if err := json.Unmarshal(in, &req); err != nil {
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return nil, err
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}
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if err := t.getTUNHandler(req, res); err != nil {
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return nil, err
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}
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return res, nil
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},
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)
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}
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47
src/tun/iface.go
Normal file
47
src/tun/iface.go
Normal file
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@ -0,0 +1,47 @@
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package tun
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const TUN_OFFSET_BYTES = 4
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func (tun *TunAdapter) read() {
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var buf [TUN_OFFSET_BYTES + 65535]byte
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for {
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n, err := tun.iface.Read(buf[:], TUN_OFFSET_BYTES)
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if n <= TUN_OFFSET_BYTES || err != nil {
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tun.log.Errorln("Error reading TUN:", err)
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ferr := tun.iface.Flush()
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if ferr != nil {
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tun.log.Errorln("Unable to flush packets:", ferr)
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}
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return
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}
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begin := TUN_OFFSET_BYTES
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end := begin + n
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bs := buf[begin:end]
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if _, err := tun.rwc.Write(bs); err != nil {
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tun.log.Debugln("Unable to send packet:", err)
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}
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}
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}
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func (tun *TunAdapter) write() {
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var buf [TUN_OFFSET_BYTES + 65535]byte
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for {
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bs := buf[TUN_OFFSET_BYTES:]
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n, err := tun.rwc.Read(bs)
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if err != nil {
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tun.log.Errorln("Exiting tun writer due to core read error:", err)
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return
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}
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if !tun.isEnabled {
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continue // Nothing to do, the tun isn't enabled
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}
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bs = buf[:TUN_OFFSET_BYTES+n]
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if _, err = tun.iface.Write(bs, TUN_OFFSET_BYTES); err != nil {
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tun.Act(nil, func() {
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if !tun.isOpen {
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tun.log.Errorln("TUN iface write error:", err)
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}
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})
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}
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}
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}
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20
src/tun/options.go
Normal file
20
src/tun/options.go
Normal file
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@ -0,0 +1,20 @@
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package tun
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func (m *TunAdapter) _applyOption(opt SetupOption) {
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switch v := opt.(type) {
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case InterfaceName:
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m.config.name = v
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case InterfaceMTU:
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m.config.mtu = v
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}
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}
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type SetupOption interface {
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isSetupOption()
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}
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type InterfaceName string
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type InterfaceMTU uint64
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func (a InterfaceName) isSetupOption() {}
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func (a InterfaceMTU) isSetupOption() {}
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162
src/tun/tun.go
Normal file
162
src/tun/tun.go
Normal file
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@ -0,0 +1,162 @@
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package tun
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// This manages the tun driver to send/recv packets to/from applications
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// TODO: Connection timeouts (call Conn.Close() when we want to time out)
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// TODO: Don't block in reader on writes that are pending searches
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import (
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"errors"
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"fmt"
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"net"
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"github.com/Arceliar/phony"
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"golang.zx2c4.com/wireguard/tun"
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"github.com/yggdrasil-network/yggdrasil-go/src/address"
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"github.com/yggdrasil-network/yggdrasil-go/src/defaults"
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"github.com/yggdrasil-network/yggdrasil-go/src/ipv6rwc"
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"github.com/yggdrasil-network/yggdrasil-go/src/util"
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)
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type MTU uint16
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// TunAdapter represents a running TUN interface and extends the
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// yggdrasil.Adapter type. In order to use the TUN adapter with Yggdrasil, you
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// should pass this object to the yggdrasil.SetRouterAdapter() function before
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// calling yggdrasil.Start().
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type TunAdapter struct {
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rwc *ipv6rwc.ReadWriteCloser
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log util.Logger
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addr address.Address
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subnet address.Subnet
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mtu uint64
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iface tun.Device
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phony.Inbox // Currently only used for _handlePacket from the reader, TODO: all the stuff that currently needs a mutex below
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//mutex sync.RWMutex // Protects the below
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isOpen bool
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isEnabled bool // Used by the writer to drop sessionTraffic if not enabled
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config struct {
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name InterfaceName
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mtu InterfaceMTU
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}
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}
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// Gets the maximum supported MTU for the platform based on the defaults in
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// defaults.GetDefaults().
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func getSupportedMTU(mtu uint64) uint64 {
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if mtu < 1280 {
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return 1280
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}
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if mtu > MaximumMTU() {
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return MaximumMTU()
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}
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return mtu
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}
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// Name returns the name of the adapter, e.g. "tun0". On Windows, this may
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// return a canonical adapter name instead.
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func (tun *TunAdapter) Name() string {
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if name, err := tun.iface.Name(); err == nil {
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return name
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}
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return ""
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}
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// MTU gets the adapter's MTU. This can range between 1280 and 65535, although
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// the maximum value is determined by your platform. The returned value will
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// never exceed that of MaximumMTU().
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func (tun *TunAdapter) MTU() uint64 {
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return getSupportedMTU(tun.mtu)
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}
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// DefaultName gets the default TUN interface name for your platform.
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func DefaultName() string {
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return defaults.GetDefaults().DefaultIfName
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}
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// DefaultMTU gets the default TUN interface MTU for your platform. This can
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// be as high as MaximumMTU(), depending on platform, but is never lower than 1280.
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func DefaultMTU() uint64 {
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return defaults.GetDefaults().DefaultIfMTU
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}
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// MaximumMTU returns the maximum supported TUN interface MTU for your
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// platform. This can be as high as 65535, depending on platform, but is never
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// lower than 1280.
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func MaximumMTU() uint64 {
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return defaults.GetDefaults().MaximumIfMTU
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}
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// Init initialises the TUN module. You must have acquired a Listener from
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// the Yggdrasil core before this point and it must not be in use elsewhere.
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func New(rwc *ipv6rwc.ReadWriteCloser, log util.Logger, opts ...SetupOption) (*TunAdapter, error) {
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tun := &TunAdapter{
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rwc: rwc,
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log: log,
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}
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for _, opt := range opts {
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tun._applyOption(opt)
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}
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return tun, tun._start()
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}
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func (tun *TunAdapter) _start() error {
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if tun.isOpen {
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return errors.New("TUN module is already started")
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}
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tun.addr = tun.rwc.Address()
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tun.subnet = tun.rwc.Subnet()
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addr := fmt.Sprintf("%s/%d", net.IP(tun.addr[:]).String(), 8*len(address.GetPrefix())-1)
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if tun.config.name == "none" || tun.config.name == "dummy" {
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tun.log.Debugln("Not starting TUN as ifname is none or dummy")
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tun.isEnabled = false
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go tun.write()
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return nil
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}
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mtu := uint64(tun.config.mtu)
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if tun.rwc.MaxMTU() < mtu {
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mtu = tun.rwc.MaxMTU()
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}
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if err := tun.setup(string(tun.config.name), addr, mtu); err != nil {
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return err
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}
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if tun.MTU() != mtu {
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tun.log.Warnf("Warning: Interface MTU %d automatically adjusted to %d (supported range is 1280-%d)", tun.config.mtu, tun.MTU(), MaximumMTU())
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}
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tun.rwc.SetMTU(tun.MTU())
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tun.isOpen = true
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tun.isEnabled = true
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go tun.read()
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go tun.write()
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return nil
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}
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// IsStarted returns true if the module has been started.
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func (tun *TunAdapter) IsStarted() bool {
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var isOpen bool
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phony.Block(tun, func() {
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isOpen = tun.isOpen
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})
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return isOpen
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}
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// Start the setup process for the TUN adapter. If successful, starts the
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// read/write goroutines to handle packets on that interface.
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func (tun *TunAdapter) Stop() error {
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var err error
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phony.Block(tun, func() {
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err = tun._stop()
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})
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return err
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}
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func (tun *TunAdapter) _stop() error {
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tun.isOpen = false
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// by TUN, e.g. readers/writers, sessions
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if tun.iface != nil {
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// Just in case we failed to start up the iface for some reason, this can apparently happen on Windows
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tun.iface.Close()
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}
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return nil
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}
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156
src/tun/tun_bsd.go
Normal file
156
src/tun/tun_bsd.go
Normal file
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//go:build openbsd || freebsd
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// +build openbsd freebsd
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package tun
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import (
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"encoding/binary"
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"os/exec"
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"strconv"
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"strings"
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"syscall"
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"unsafe"
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"golang.org/x/sys/unix"
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wgtun "golang.zx2c4.com/wireguard/tun"
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)
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const SIOCSIFADDR_IN6 = (0x80000000) | ((288 & 0x1fff) << 16) | uint32(byte('i'))<<8 | 12
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type in6_addrlifetime struct {
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ia6t_expire float64
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ia6t_preferred float64
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ia6t_vltime uint32
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ia6t_pltime uint32
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}
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type sockaddr_in6 struct {
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sin6_len uint8
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sin6_family uint8
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sin6_port uint8
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sin6_flowinfo uint32
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sin6_addr [8]uint16
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sin6_scope_id uint32
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}
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/*
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from <netinet6/in6_var.h>
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struct in6_ifreq {
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277 char ifr_name[IFNAMSIZ];
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278 union {
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279 struct sockaddr_in6 ifru_addr;
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280 struct sockaddr_in6 ifru_dstaddr;
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281 int ifru_flags;
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282 int ifru_flags6;
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283 int ifru_metric;
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284 caddr_t ifru_data;
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285 struct in6_addrlifetime ifru_lifetime;
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286 struct in6_ifstat ifru_stat;
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287 struct icmp6_ifstat ifru_icmp6stat;
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288 u_int32_t ifru_scope_id[16];
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289 } ifr_ifru;
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290 };
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*/
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type in6_ifreq_mtu struct {
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ifr_name [syscall.IFNAMSIZ]byte
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ifru_mtu int
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}
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type in6_ifreq_addr struct {
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ifr_name [syscall.IFNAMSIZ]byte
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ifru_addr sockaddr_in6
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}
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type in6_ifreq_flags struct {
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ifr_name [syscall.IFNAMSIZ]byte
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flags int
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}
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type in6_ifreq_lifetime struct {
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ifr_name [syscall.IFNAMSIZ]byte
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ifru_addrlifetime in6_addrlifetime
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}
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// Configures the TUN adapter with the correct IPv6 address and MTU.
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func (tun *TunAdapter) setup(ifname string, addr string, mtu uint64) error {
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iface, err := wgtun.CreateTUN(ifname, int(mtu))
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if err != nil {
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panic(err)
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}
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tun.iface = iface
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if mtu, err := iface.MTU(); err == nil {
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tun.mtu = getSupportedMTU(uint64(mtu))
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} else {
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tun.mtu = 0
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}
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return tun.setupAddress(addr)
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}
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func (tun *TunAdapter) setupAddress(addr string) error {
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var sfd int
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var err error
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// Create system socket
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if sfd, err = unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, 0); err != nil {
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tun.log.Printf("Create AF_INET socket failed: %v.", err)
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return err
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}
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// Friendly output
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tun.log.Infof("Interface name: %s", tun.Name())
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tun.log.Infof("Interface IPv6: %s", addr)
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tun.log.Infof("Interface MTU: %d", tun.mtu)
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// Create the MTU request
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var ir in6_ifreq_mtu
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copy(ir.ifr_name[:], tun.Name())
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ir.ifru_mtu = int(tun.mtu)
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// Set the MTU
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if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(sfd), uintptr(syscall.SIOCSIFMTU), uintptr(unsafe.Pointer(&ir))); errno != 0 {
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err = errno
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tun.log.Errorf("Error in SIOCSIFMTU: %v", errno)
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// Fall back to ifconfig to set the MTU
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cmd := exec.Command("ifconfig", tun.Name(), "mtu", string(tun.mtu))
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tun.log.Warnf("Using ifconfig as fallback: %v", strings.Join(cmd.Args, " "))
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output, err := cmd.CombinedOutput()
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if err != nil {
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tun.log.Errorf("SIOCSIFMTU fallback failed: %v.", err)
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tun.log.Traceln(string(output))
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}
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}
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|
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// Create the address request
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// FIXME: I don't work!
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var ar in6_ifreq_addr
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copy(ar.ifr_name[:], tun.Name())
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ar.ifru_addr.sin6_len = uint8(unsafe.Sizeof(ar.ifru_addr))
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ar.ifru_addr.sin6_family = unix.AF_INET6
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parts := strings.Split(strings.Split(addr, "/")[0], ":")
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for i := 0; i < 8; i++ {
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addr, _ := strconv.ParseUint(parts[i], 16, 16)
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b := make([]byte, 16)
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binary.LittleEndian.PutUint16(b, uint16(addr))
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ar.ifru_addr.sin6_addr[i] = uint16(binary.BigEndian.Uint16(b))
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}
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|
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// Set the interface address
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if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(sfd), uintptr(SIOCSIFADDR_IN6), uintptr(unsafe.Pointer(&ar))); errno != 0 {
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err = errno
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tun.log.Errorf("Error in SIOCSIFADDR_IN6: %v", errno)
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// Fall back to ifconfig to set the address
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cmd := exec.Command("ifconfig", tun.Name(), "inet6", addr)
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tun.log.Warnf("Using ifconfig as fallback: %v", strings.Join(cmd.Args, " "))
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output, err := cmd.CombinedOutput()
|
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if err != nil {
|
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tun.log.Errorf("SIOCSIFADDR_IN6 fallback failed: %v.", err)
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tun.log.Traceln(string(output))
|
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}
|
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}
|
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|
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return nil
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}
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133
src/tun/tun_darwin.go
Normal file
133
src/tun/tun_darwin.go
Normal file
|
|
@ -0,0 +1,133 @@
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//go:build !mobile
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// +build !mobile
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|
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package tun
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|
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// The darwin platform specific tun parts
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|
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import (
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"encoding/binary"
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"strconv"
|
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"strings"
|
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"unsafe"
|
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|
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"golang.org/x/sys/unix"
|
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|
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wgtun "golang.zx2c4.com/wireguard/tun"
|
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)
|
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|
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// Configures the "utun" adapter with the correct IPv6 address and MTU.
|
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func (tun *TunAdapter) setup(ifname string, addr string, mtu uint64) error {
|
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if ifname == "auto" {
|
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ifname = "utun"
|
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}
|
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iface, err := wgtun.CreateTUN(ifname, int(mtu))
|
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if err != nil {
|
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panic(err)
|
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}
|
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tun.iface = iface
|
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if m, err := iface.MTU(); err == nil {
|
||||
tun.mtu = getSupportedMTU(uint64(m))
|
||||
} else {
|
||||
tun.mtu = 0
|
||||
}
|
||||
return tun.setupAddress(addr)
|
||||
}
|
||||
|
||||
const (
|
||||
darwin_SIOCAIFADDR_IN6 = 2155899162 // netinet6/in6_var.h
|
||||
darwin_IN6_IFF_NODAD = 0x0020 // netinet6/in6_var.h
|
||||
darwin_IN6_IFF_SECURED = 0x0400 // netinet6/in6_var.h
|
||||
darwin_ND6_INFINITE_LIFETIME = 0xFFFFFFFF // netinet6/nd6.h
|
||||
)
|
||||
|
||||
// nolint:structcheck
|
||||
type in6_addrlifetime struct {
|
||||
ia6t_expire float64 // nolint:unused
|
||||
ia6t_preferred float64 // nolint:unused
|
||||
ia6t_vltime uint32
|
||||
ia6t_pltime uint32
|
||||
}
|
||||
|
||||
// nolint:structcheck
|
||||
type sockaddr_in6 struct {
|
||||
sin6_len uint8
|
||||
sin6_family uint8
|
||||
sin6_port uint8 // nolint:unused
|
||||
sin6_flowinfo uint32 // nolint:unused
|
||||
sin6_addr [8]uint16
|
||||
sin6_scope_id uint32 // nolint:unused
|
||||
}
|
||||
|
||||
// nolint:structcheck
|
||||
type in6_aliasreq struct {
|
||||
ifra_name [16]byte
|
||||
ifra_addr sockaddr_in6
|
||||
ifra_dstaddr sockaddr_in6 // nolint:unused
|
||||
ifra_prefixmask sockaddr_in6
|
||||
ifra_flags uint32
|
||||
ifra_lifetime in6_addrlifetime
|
||||
}
|
||||
|
||||
type ifreq struct {
|
||||
ifr_name [16]byte
|
||||
ifru_mtu uint32
|
||||
}
|
||||
|
||||
// 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 *TunAdapter) setupAddress(addr string) error {
|
||||
var fd int
|
||||
var err error
|
||||
|
||||
if fd, err = unix.Socket(unix.AF_INET6, unix.SOCK_DGRAM, 0); err != nil {
|
||||
tun.log.Printf("Create AF_SYSTEM socket failed: %v.", err)
|
||||
return err
|
||||
}
|
||||
|
||||
var ar in6_aliasreq
|
||||
copy(ar.ifra_name[:], tun.Name())
|
||||
|
||||
ar.ifra_prefixmask.sin6_len = uint8(unsafe.Sizeof(ar.ifra_prefixmask))
|
||||
b := make([]byte, 16)
|
||||
binary.LittleEndian.PutUint16(b, uint16(0xFE00))
|
||||
ar.ifra_prefixmask.sin6_addr[0] = binary.BigEndian.Uint16(b)
|
||||
|
||||
ar.ifra_addr.sin6_len = uint8(unsafe.Sizeof(ar.ifra_addr))
|
||||
ar.ifra_addr.sin6_family = unix.AF_INET6
|
||||
parts := strings.Split(strings.Split(addr, "/")[0], ":")
|
||||
for i := 0; i < 8; i++ {
|
||||
addr, _ := strconv.ParseUint(parts[i], 16, 16)
|
||||
b := make([]byte, 16)
|
||||
binary.LittleEndian.PutUint16(b, uint16(addr))
|
||||
ar.ifra_addr.sin6_addr[i] = binary.BigEndian.Uint16(b)
|
||||
}
|
||||
|
||||
ar.ifra_flags |= darwin_IN6_IFF_NODAD
|
||||
ar.ifra_flags |= darwin_IN6_IFF_SECURED
|
||||
|
||||
ar.ifra_lifetime.ia6t_vltime = darwin_ND6_INFINITE_LIFETIME
|
||||
ar.ifra_lifetime.ia6t_pltime = darwin_ND6_INFINITE_LIFETIME
|
||||
|
||||
var ir ifreq
|
||||
copy(ir.ifr_name[:], tun.Name())
|
||||
ir.ifru_mtu = uint32(tun.mtu)
|
||||
|
||||
tun.log.Infof("Interface name: %s", ar.ifra_name)
|
||||
tun.log.Infof("Interface IPv6: %s", addr)
|
||||
tun.log.Infof("Interface MTU: %d", ir.ifru_mtu)
|
||||
|
||||
if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(darwin_SIOCAIFADDR_IN6), uintptr(unsafe.Pointer(&ar))); errno != 0 {
|
||||
err = errno
|
||||
tun.log.Errorf("Error in darwin_SIOCAIFADDR_IN6: %v", errno)
|
||||
return err
|
||||
}
|
||||
|
||||
if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(unix.SIOCSIFMTU), uintptr(unsafe.Pointer(&ir))); errno != 0 {
|
||||
err = errno
|
||||
tun.log.Errorf("Error in SIOCSIFMTU: %v", errno)
|
||||
return err
|
||||
}
|
||||
|
||||
return err
|
||||
}
|
||||
58
src/tun/tun_linux.go
Normal file
58
src/tun/tun_linux.go
Normal file
|
|
@ -0,0 +1,58 @@
|
|||
//go:build !mobile
|
||||
// +build !mobile
|
||||
|
||||
package tun
|
||||
|
||||
// The linux platform specific tun parts
|
||||
|
||||
import (
|
||||
"github.com/vishvananda/netlink"
|
||||
wgtun "golang.zx2c4.com/wireguard/tun"
|
||||
)
|
||||
|
||||
// Configures the TUN adapter with the correct IPv6 address and MTU.
|
||||
func (tun *TunAdapter) setup(ifname string, addr string, mtu uint64) error {
|
||||
if ifname == "auto" {
|
||||
ifname = "\000"
|
||||
}
|
||||
iface, err := wgtun.CreateTUN(ifname, int(mtu))
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
tun.iface = iface
|
||||
if mtu, err := iface.MTU(); err == nil {
|
||||
tun.mtu = getSupportedMTU(uint64(mtu))
|
||||
} else {
|
||||
tun.mtu = 0
|
||||
}
|
||||
return tun.setupAddress(addr)
|
||||
}
|
||||
|
||||
// Configures the TUN adapter with the correct IPv6 address and MTU. Netlink
|
||||
// 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 *TunAdapter) setupAddress(addr string) error {
|
||||
nladdr, err := netlink.ParseAddr(addr)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
nlintf, err := netlink.LinkByName(tun.Name())
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if err := netlink.AddrAdd(nlintf, nladdr); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := netlink.LinkSetMTU(nlintf, int(tun.mtu)); err != nil {
|
||||
return err
|
||||
}
|
||||
if err := netlink.LinkSetUp(nlintf); err != nil {
|
||||
return err
|
||||
}
|
||||
// Friendly output
|
||||
tun.log.Infof("Interface name: %s", tun.Name())
|
||||
tun.log.Infof("Interface IPv6: %s", addr)
|
||||
tun.log.Infof("Interface MTU: %d", tun.mtu)
|
||||
return nil
|
||||
}
|
||||
33
src/tun/tun_other.go
Normal file
33
src/tun/tun_other.go
Normal file
|
|
@ -0,0 +1,33 @@
|
|||
//go:build !linux && !darwin && !windows && !openbsd && !freebsd && !mobile
|
||||
// +build !linux,!darwin,!windows,!openbsd,!freebsd,!mobile
|
||||
|
||||
package tun
|
||||
|
||||
// This is to catch unsupported platforms
|
||||
// If your platform supports tun devices, you could try configuring it manually
|
||||
|
||||
import (
|
||||
wgtun "golang.zx2c4.com/wireguard/tun"
|
||||
)
|
||||
|
||||
// Configures the TUN adapter with the correct IPv6 address and MTU.
|
||||
func (tun *TunAdapter) setup(ifname string, addr string, mtu uint64) error {
|
||||
iface, err := wgtun.CreateTUN(ifname, mtu)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
tun.iface = iface
|
||||
if mtu, err := iface.MTU(); err == nil {
|
||||
tun.mtu = getSupportedMTU(uint64(mtu))
|
||||
} else {
|
||||
tun.mtu = 0
|
||||
}
|
||||
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 {
|
||||
tun.log.Warnln("Warning: Platform not supported, you must set the address of", tun.Name(), "to", addr)
|
||||
return nil
|
||||
}
|
||||
151
src/tun/tun_windows.go
Normal file
151
src/tun/tun_windows.go
Normal file
|
|
@ -0,0 +1,151 @@
|
|||
//go:build windows
|
||||
// +build windows
|
||||
|
||||
package tun
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"errors"
|
||||
"log"
|
||||
"net"
|
||||
|
||||
"github.com/yggdrasil-network/yggdrasil-go/src/defaults"
|
||||
"golang.org/x/sys/windows"
|
||||
|
||||
wgtun "golang.zx2c4.com/wireguard/tun"
|
||||
"golang.zx2c4.com/wireguard/windows/elevate"
|
||||
"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
|
||||
)
|
||||
|
||||
// This is to catch Windows platforms
|
||||
|
||||
// Configures the TUN adapter with the correct IPv6 address and MTU.
|
||||
func (tun *TunAdapter) setup(ifname string, addr string, mtu uint64) error {
|
||||
if ifname == "auto" {
|
||||
ifname = defaults.GetDefaults().DefaultIfName
|
||||
}
|
||||
return elevate.DoAsSystem(func() error {
|
||||
var err error
|
||||
var iface wgtun.Device
|
||||
var guid windows.GUID
|
||||
if guid, err = windows.GUIDFromString("{8f59971a-7872-4aa6-b2eb-061fc4e9d0a7}"); err != nil {
|
||||
return err
|
||||
}
|
||||
if iface, err = wgtun.CreateTUNWithRequestedGUID(ifname, &guid, int(mtu)); err != nil {
|
||||
return err
|
||||
}
|
||||
tun.iface = iface
|
||||
if err = tun.setupAddress(addr); err != nil {
|
||||
tun.log.Errorln("Failed to set up TUN address:", err)
|
||||
return err
|
||||
}
|
||||
if err = tun.setupMTU(getSupportedMTU(mtu)); err != nil {
|
||||
tun.log.Errorln("Failed to set up TUN MTU:", err)
|
||||
return err
|
||||
}
|
||||
if mtu, err := iface.MTU(); err == nil {
|
||||
tun.mtu = uint64(mtu)
|
||||
}
|
||||
return nil
|
||||
})
|
||||
}
|
||||
|
||||
// Sets the MTU of the TUN adapter.
|
||||
func (tun *TunAdapter) setupMTU(mtu uint64) error {
|
||||
if tun.iface == nil || tun.Name() == "" {
|
||||
return errors.New("Can't configure MTU as TUN adapter is not present")
|
||||
}
|
||||
if intf, ok := tun.iface.(*wgtun.NativeTun); ok {
|
||||
luid := winipcfg.LUID(intf.LUID())
|
||||
ipfamily, err := luid.IPInterface(windows.AF_INET6)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
ipfamily.NLMTU = uint32(mtu)
|
||||
intf.ForceMTU(int(ipfamily.NLMTU))
|
||||
ipfamily.UseAutomaticMetric = false
|
||||
ipfamily.Metric = 0
|
||||
ipfamily.DadTransmits = 0
|
||||
ipfamily.RouterDiscoveryBehavior = winipcfg.RouterDiscoveryDisabled
|
||||
|
||||
if err := ipfamily.Set(); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// Sets the IPv6 address of the TUN adapter.
|
||||
func (tun *TunAdapter) setupAddress(addr string) error {
|
||||
if tun.iface == nil || tun.Name() == "" {
|
||||
return errors.New("Can't configure IPv6 address as TUN adapter is not present")
|
||||
}
|
||||
if intf, ok := tun.iface.(*wgtun.NativeTun); ok {
|
||||
if ipaddr, ipnet, err := net.ParseCIDR(addr); err == nil {
|
||||
luid := winipcfg.LUID(intf.LUID())
|
||||
addresses := append([]net.IPNet{}, net.IPNet{
|
||||
IP: ipaddr,
|
||||
Mask: ipnet.Mask,
|
||||
})
|
||||
|
||||
err := luid.SetIPAddressesForFamily(windows.AF_INET6, addresses)
|
||||
if err == windows.ERROR_OBJECT_ALREADY_EXISTS {
|
||||
cleanupAddressesOnDisconnectedInterfaces(windows.AF_INET6, addresses)
|
||||
err = luid.SetIPAddressesForFamily(windows.AF_INET6, addresses)
|
||||
}
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
} else {
|
||||
return err
|
||||
}
|
||||
} else {
|
||||
return errors.New("unable to get NativeTUN")
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
/*
|
||||
* cleanupAddressesOnDisconnectedInterfaces
|
||||
* SPDX-License-Identifier: MIT
|
||||
* Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
|
||||
*/
|
||||
func cleanupAddressesOnDisconnectedInterfaces(family winipcfg.AddressFamily, addresses []net.IPNet) {
|
||||
if len(addresses) == 0 {
|
||||
return
|
||||
}
|
||||
includedInAddresses := func(a net.IPNet) bool {
|
||||
// TODO: this makes the whole algorithm O(n^2). But we can't stick net.IPNet in a Go hashmap. Bummer!
|
||||
for _, addr := range addresses {
|
||||
ip := addr.IP
|
||||
if ip4 := ip.To4(); ip4 != nil {
|
||||
ip = ip4
|
||||
}
|
||||
mA, _ := addr.Mask.Size()
|
||||
mB, _ := a.Mask.Size()
|
||||
if bytes.Equal(ip, a.IP) && mA == mB {
|
||||
return true
|
||||
}
|
||||
}
|
||||
return false
|
||||
}
|
||||
interfaces, err := winipcfg.GetAdaptersAddresses(family, winipcfg.GAAFlagDefault)
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
for _, iface := range interfaces {
|
||||
if iface.OperStatus == winipcfg.IfOperStatusUp {
|
||||
continue
|
||||
}
|
||||
for address := iface.FirstUnicastAddress; address != nil; address = address.Next {
|
||||
ip := address.Address.IP()
|
||||
ipnet := net.IPNet{IP: ip, Mask: net.CIDRMask(int(address.OnLinkPrefixLength), 8*len(ip))}
|
||||
if includedInAddresses(ipnet) {
|
||||
log.Printf("Cleaning up stale address %s from interface ‘%s’", ipnet.String(), iface.FriendlyName())
|
||||
iface.LUID.DeleteIPAddress(ipnet)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue