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non-blocking io for linux

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This commit is contained in:
Nate Brown
2025-04-02 22:57:37 -05:00
parent f46b83f2c4
commit 194fde45da
5 changed files with 196 additions and 177 deletions
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45
overlay/tun_linux.go
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@@ -66,6 +66,11 @@ type ifreqQLEN struct {
}
func newTunFromFd(c *config.C, l *logrus.Logger, deviceFd int, vpnNetworks []netip.Prefix) (*tun, error) {
err := unix.SetNonblock(deviceFd, true)
if err != nil {
return nil, err
}
file := os.NewFile(uintptr(deviceFd), "/dev/net/tun")
t, err := newTunGeneric(c, l, file, vpnNetworks)
@@ -112,6 +117,11 @@ func newTun(c *config.C, l *logrus.Logger, vpnNetworks []netip.Prefix, multiqueu
}
name := strings.Trim(string(req.Name[:]), "\x00")
err = unix.SetNonblock(fd, true)
if err != nil {
return nil, err
}
file := os.NewFile(uintptr(fd), "/dev/net/tun")
t, err := newTunGeneric(c, l, file, vpnNetworks)
if err != nil {
@@ -134,7 +144,12 @@ func newTunGeneric(c *config.C, l *logrus.Logger, file *os.File, vpnNetworks []n
l: l,
}
err := t.reload(c, true)
err := unix.SetNonblock(t.fd, true)
if err != nil {
return nil, err
}
err = t.reload(c, true)
if err != nil {
return nil, err
}
@@ -229,6 +244,11 @@ func (t *tun) NewMultiQueueReader() (io.ReadWriteCloser, error) {
return nil, err
}
err = unix.SetNonblock(fd, true)
if err != nil {
return nil, err
}
file := os.NewFile(uintptr(fd), "/dev/net/tun")
return file, nil
@@ -239,29 +259,6 @@ func (t *tun) RoutesFor(ip netip.Addr) routing.Gateways {
return r
}
func (t *tun) Write(b []byte) (int, error) {
var nn int
maximum := len(b)
for {
n, err := unix.Write(t.fd, b[nn:maximum])
if n > 0 {
nn += n
}
if nn == len(b) {
return nn, err
}
if err != nil {
return nn, err
}
if n == 0 {
return nn, io.ErrUnexpectedEOF
}
}
}
func (t *tun) deviceBytes() (o [16]byte) {
for i, c := range t.Device {
o[i] = byte(c)