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all: detect JetKVM and specialize a handful of things for it

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Updates #16524

Change-Id: I183428de8c65d7155d82979d2d33f031c22e3331
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2025-07-10 11:14:08 -07:00
committed by Brad Fitzpatrick
parent bebc796e6c
commit fbc6a9ec5a
10 changed files with 89 additions and 12 deletions
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20
net/tstun/tun.go
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@@ -24,6 +24,9 @@ import (
// CrateTAP is the hook set by feature/tap.
var CreateTAP feature.Hook[func(logf logger.Logf, tapName, bridgeName string) (tun.Device, error)]
// modprobeTunHook is a Linux-specific hook to run "/sbin/modprobe tun".
var modprobeTunHook feature.Hook[func() error]
// New returns a tun.Device for the requested device name, along with
// the OS-dependent name that was allocated to the device.
func New(logf logger.Logf, tunName string) (tun.Device, string, error) {
@@ -51,7 +54,22 @@ func New(logf logger.Logf, tunName string) (tun.Device, string, error) {
if runtime.GOOS == "plan9" {
cleanUpPlan9Interfaces()
}
dev, err = tun.CreateTUN(tunName, int(DefaultTUNMTU()))
// Try to create the TUN device up to two times. If it fails
// the first time and we're on Linux, try a desperate
// "modprobe tun" to load the tun module and try again.
for try := range 2 {
dev, err = tun.CreateTUN(tunName, int(DefaultTUNMTU()))
if err == nil || !modprobeTunHook.IsSet() {
if try > 0 {
logf("created TUN device %q after doing `modprobe tun`", tunName)
}
break
}
if modprobeTunHook.Get()() != nil {
// modprobe failed; no point trying again.
break
}
}
}
if err != nil {
return nil, "", err