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tun: only call .Fd() once

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Doing so tends to make the tunnel blocking, so we only retrieve it once
before we call SetNonblock, and then cache the result.
This commit is contained in:
Jason A. Donenfeld 2018-10-17 21:26:53 +02:00
parent 85b2378a07
commit 2e772194cf
4 changed files with 67 additions and 61 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
tun/tun_darwin.go
View File

@ -37,7 +37,8 @@ type sockaddrCtl struct {
type nativeTun struct {
name string
fd *os.File
tunFile *os.File
fd uintptr
rwcancel *rwcancel.RWCancel
events chan TUNEvent
errors chan error
@ -171,14 +172,15 @@ func CreateTUN(name string, mtu int) (TUNDevice, error) {
func CreateTUNFromFile(file *os.File, mtu int) (TUNDevice, error) {
tun := &nativeTun{
fd: file,
events: make(chan TUNEvent, 10),
errors: make(chan error, 1),
tunFile: file,
fd: file.Fd(),
events: make(chan TUNEvent, 10),
errors: make(chan error, 1),
}
name, err := tun.Name()
if err != nil {
tun.fd.Close()
tun.tunFile.Close()
return nil, err
}
@ -190,19 +192,19 @@ func CreateTUNFromFile(file *os.File, mtu int) (TUNDevice, error) {
return iface.Index, nil
}()
if err != nil {
tun.fd.Close()
tun.tunFile.Close()
return nil, err
}
tun.rwcancel, err = rwcancel.NewRWCancel(int(file.Fd()))
tun.rwcancel, err = rwcancel.NewRWCancel(int(tun.fd))
if err != nil {
tun.fd.Close()
tun.tunFile.Close()
return nil, err
}
tun.routeSocket, err = unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW, unix.AF_UNSPEC)
if err != nil {
tun.fd.Close()
tun.tunFile.Close()
return nil, err
}
@ -226,7 +228,7 @@ func (tun *nativeTun) Name() (string, error) {
_, _, errno := unix.Syscall6(
unix.SYS_GETSOCKOPT,
uintptr(tun.fd.Fd()),
uintptr(tun.fd),
2, /* #define SYSPROTO_CONTROL 2 */
2, /* #define UTUN_OPT_IFNAME 2 */
uintptr(unsafe.Pointer(&ifName)),
@ -241,7 +243,7 @@ func (tun *nativeTun) Name() (string, error) {
}
func (tun *nativeTun) File() *os.File {
return tun.fd
return tun.tunFile
}
func (tun *nativeTun) Events() chan TUNEvent {
@ -254,7 +256,7 @@ func (tun *nativeTun) doRead(buff []byte, offset int) (int, error) {
return 0, err
default:
buff := buff[offset-4:]
n, err := tun.fd.Read(buff[:])
n, err := tun.tunFile.Read(buff[:])
if n < 4 {
return 0, err
}
@ -294,13 +296,13 @@ func (tun *nativeTun) Write(buff []byte, offset int) (int, error) {
// write
return tun.fd.Write(buff)
return tun.tunFile.Write(buff)
}
func (tun *nativeTun) Close() error {
var err3 error
err1 := tun.rwcancel.Cancel()
err2 := tun.fd.Close()
err2 := tun.tunFile.Close()
if tun.routeSocket != -1 {
unix.Shutdown(tun.routeSocket, unix.SHUT_RDWR)
err3 = unix.Close(tun.routeSocket)

40
tun/tun_freebsd.go
View File

@ -51,7 +51,8 @@ type ifstat struct {
type nativeTun struct {
name string
fd *os.File
tunFile *os.File
fd uintptr
rwcancel *rwcancel.RWCancel
events chan TUNEvent
errors chan error
@ -237,15 +238,15 @@ func CreateTUN(name string, mtu int) (TUNDevice, error) {
return nil, fmt.Errorf("interface %s already exists", name)
}
tunfile, err := os.OpenFile("/dev/tun", unix.O_RDWR, 0)
tunFile, err := os.OpenFile("/dev/tun", unix.O_RDWR, 0)
if err != nil {
return nil, err
}
tunfd := tunfile.Fd()
tunfd := tunFile.Fd()
assignedName, err := tunName(tunfd)
if err != nil {
tunfile.Close()
tunFile.Close()
return nil, err
}
@ -293,25 +294,26 @@ func CreateTUN(name string, mtu int) (TUNDevice, error) {
uintptr(unsafe.Pointer(&ifr)),
)
if errno != 0 {
tunfile.Close()
tunFile.Close()
tunDestroy(name)
return nil, fmt.Errorf("failed to rename %s to %s: %s", assignedName, name, errno.Error())
}
return CreateTUNFromFile(tunfile, mtu)
return CreateTUNFromFile(tunFile, mtu)
}
func CreateTUNFromFile(file *os.File, mtu int) (TUNDevice, error) {
tun := &nativeTun{
fd: file,
events: make(chan TUNEvent, 10),
errors: make(chan error, 1),
tunFile: file,
fd: file.Fd(),
events: make(chan TUNEvent, 10),
errors: make(chan error, 1),
}
name, err := tun.Name()
if err != nil {
tun.fd.Close()
tun.tunFile.Close()
return nil, err
}
@ -323,19 +325,19 @@ func CreateTUNFromFile(file *os.File, mtu int) (TUNDevice, error) {
return iface.Index, nil
}()
if err != nil {
tun.fd.Close()
tun.tunFile.Close()
return nil, err
}
tun.rwcancel, err = rwcancel.NewRWCancel(int(file.Fd()))
tun.rwcancel, err = rwcancel.NewRWCancel(int(tun.fd))
if err != nil {
tun.fd.Close()
tun.tunFile.Close()
return nil, err
}
tun.routeSocket, err = unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW, unix.AF_UNSPEC)
if err != nil {
tun.fd.Close()
tun.tunFile.Close()
return nil, err
}
@ -351,7 +353,7 @@ func CreateTUNFromFile(file *os.File, mtu int) (TUNDevice, error) {
}
func (tun *nativeTun) Name() (string, error) {
name, err := tunName(tun.fd.Fd())
name, err := tunName(tun.fd)
if err != nil {
return "", err
}
@ -360,7 +362,7 @@ func (tun *nativeTun) Name() (string, error) {
}
func (tun *nativeTun) File() *os.File {
return tun.fd
return tun.tunFile
}
func (tun *nativeTun) Events() chan TUNEvent {
@ -373,7 +375,7 @@ func (tun *nativeTun) doRead(buff []byte, offset int) (int, error) {
return 0, err
default:
buff := buff[offset-4:]
n, err := tun.fd.Read(buff[:])
n, err := tun.tunFile.Read(buff[:])
if n < 4 {
return 0, err
}
@ -413,13 +415,13 @@ func (tun *nativeTun) Write(buff []byte, offset int) (int, error) {
// write
return tun.fd.Write(buff)
return tun.tunFile.Write(buff)
}
func (tun *nativeTun) Close() error {
var err4 error
err1 := tun.rwcancel.Cancel()
err2 := tun.fd.Close()
err2 := tun.tunFile.Close()
err3 := tunDestroy(tun.name)
if tun.routeSocket != -1 {
unix.Shutdown(tun.routeSocket, unix.SHUT_RDWR)

32
tun/tun_linux.go
View File

@ -29,7 +29,8 @@ const (
)
type nativeTun struct {
fd *os.File
tunFile *os.File
fd uintptr
fdCancel *rwcancel.RWCancel
index int32 // if index
name string // name of interface
@ -43,7 +44,7 @@ type nativeTun struct {
}
func (tun *nativeTun) File() *os.File {
return tun.fd
return tun.tunFile
}
func (tun *nativeTun) routineHackListener() {
@ -51,7 +52,7 @@ func (tun *nativeTun) routineHackListener() {
/* This is needed for the detection to work across network namespaces
* If you are reading this and know a better method, please get in touch.
*/
fd := int(tun.fd.Fd())
fd := int(tun.fd)
for {
_, err := unix.Write(fd, nil)
switch err {
@ -266,7 +267,7 @@ func (tun *nativeTun) Name() (string, error) {
var ifr [ifReqSize]byte
_, _, errno := unix.Syscall(
unix.SYS_IOCTL,
tun.fd.Fd(),
tun.fd,
uintptr(unix.TUNGETIFF),
uintptr(unsafe.Pointer(&ifr[0])),
)
@ -307,7 +308,7 @@ func (tun *nativeTun) Write(buff []byte, offset int) (int, error) {
// write
return tun.fd.Write(buff)
return tun.tunFile.Write(buff)
}
func (tun *nativeTun) doRead(buff []byte, offset int) (int, error) {
@ -316,10 +317,10 @@ func (tun *nativeTun) doRead(buff []byte, offset int) (int, error) {
return 0, err
default:
if tun.nopi {
return tun.fd.Read(buff[offset:])
return tun.tunFile.Read(buff[offset:])
} else {
buff := buff[offset-4:]
n, err := tun.fd.Read(buff[:])
n, err := tun.tunFile.Read(buff[:])
if n < 4 {
return 0, err
}
@ -354,7 +355,7 @@ func (tun *nativeTun) Close() error {
} else if tun.events != nil {
close(tun.events)
}
err2 := tun.fd.Close()
err2 := tun.tunFile.Close()
err3 := tun.fdCancel.Cancel()
if err1 != nil {
@ -413,23 +414,24 @@ func CreateTUN(name string, mtu int) (TUNDevice, error) {
func CreateTUNFromFile(file *os.File, mtu int) (TUNDevice, error) {
tun := &nativeTun{
fd: file,
tunFile: file,
fd: file.Fd(),
events: make(chan TUNEvent, 5),
errors: make(chan error, 5),
statusListenersShutdown: make(chan struct{}),
nopi: false,
nopi: false,
}
var err error
tun.fdCancel, err = rwcancel.NewRWCancel(int(file.Fd()))
tun.fdCancel, err = rwcancel.NewRWCancel(int(tun.fd))
if err != nil {
tun.fd.Close()
tun.tunFile.Close()
return nil, err
}
_, err = tun.Name()
if err != nil {
tun.fd.Close()
tun.tunFile.Close()
return nil, err
}
@ -442,12 +444,12 @@ func CreateTUNFromFile(file *os.File, mtu int) (TUNDevice, error) {
tun.netlinkSock, err = createNetlinkSocket()
if err != nil {
tun.fd.Close()
tun.tunFile.Close()
return nil, err
}
tun.netlinkCancel, err = rwcancel.NewRWCancel(tun.netlinkSock)
if err != nil {
tun.fd.Close()
tun.tunFile.Close()
return nil, err
}

26
tun/tun_openbsd.go
View File

@ -29,7 +29,7 @@ const _TUNSIFMODE = 0x8004745d
type nativeTun struct {
name string
fd *os.File
tunFile *os.File
rwcancel *rwcancel.RWCancel
events chan TUNEvent
errors chan error
@ -144,14 +144,14 @@ func CreateTUN(name string, mtu int) (TUNDevice, error) {
func CreateTUNFromFile(file *os.File, mtu int) (TUNDevice, error) {
tun := &nativeTun{
fd: file,
events: make(chan TUNEvent, 10),
errors: make(chan error, 1),
tunFile: file,
events: make(chan TUNEvent, 10),
errors: make(chan error, 1),
}
name, err := tun.Name()
if err != nil {
tun.fd.Close()
tun.tunFile.Close()
return nil, err
}
@ -163,19 +163,19 @@ func CreateTUNFromFile(file *os.File, mtu int) (TUNDevice, error) {
return iface.Index, nil
}()
if err != nil {
tun.fd.Close()
tun.tunFile.Close()
return nil, err
}
tun.rwcancel, err = rwcancel.NewRWCancel(int(file.Fd()))
if err != nil {
tun.fd.Close()
tun.tunFile.Close()
return nil, err
}
tun.routeSocket, err = unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW, unix.AF_UNSPEC)
if err != nil {
tun.fd.Close()
tun.tunFile.Close()
return nil, err
}
@ -191,7 +191,7 @@ func CreateTUNFromFile(file *os.File, mtu int) (TUNDevice, error) {
}
func (tun *nativeTun) Name() (string, error) {
gostat, err := tun.fd.Stat()
gostat, err := tun.tunFile.Stat()
if err != nil {
tun.name = ""
return "", err
@ -202,7 +202,7 @@ func (tun *nativeTun) Name() (string, error) {
}
func (tun *nativeTun) File() *os.File {
return tun.fd
return tun.tunFile
}
func (tun *nativeTun) Events() chan TUNEvent {
@ -215,7 +215,7 @@ func (tun *nativeTun) doRead(buff []byte, offset int) (int, error) {
return 0, err
default:
buff := buff[offset-4:]
n, err := tun.fd.Read(buff[:])
n, err := tun.tunFile.Read(buff[:])
if n < 4 {
return 0, err
}
@ -255,13 +255,13 @@ func (tun *nativeTun) Write(buff []byte, offset int) (int, error) {
// write
return tun.fd.Write(buff)
return tun.tunFile.Write(buff)
}
func (tun *nativeTun) Close() error {
var err3 error
err1 := tun.rwcancel.Cancel()
err2 := tun.fd.Close()
err2 := tun.tunFile.Close()
if tun.routeSocket != -1 {
unix.Shutdown(tun.routeSocket, unix.SHUT_RDWR)
err3 = unix.Close(tun.routeSocket)