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net/tstun: add Plan 9 'tun' support

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Updates #5794

Change-Id: I8c466cae25ae79be1097450a63e8c25c7b519331
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2025-04-01 04:01:00 -07:00
committed by Brad Fitzpatrick
parent e2f7750125
commit 60847128df
6 changed files with 55 additions and 6 deletions
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38
net/tstun/tun.go
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@@ -1,7 +1,7 @@
// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
//go:build !wasm && !plan9 && !tamago && !aix && !solaris && !illumos
//go:build !wasm && !tamago && !aix && !solaris && !illumos
// Package tun creates a tuntap device, working around OS-specific
// quirks if necessary.
@@ -9,6 +9,9 @@ package tstun
import (
"errors"
"fmt"
"log"
"os"
"runtime"
"strings"
"time"
@@ -45,6 +48,9 @@ func New(logf logger.Logf, tunName string) (tun.Device, string, error) {
}
dev, err = CreateTAP.Get()(logf, tapName, bridgeName)
} else {
if runtime.GOOS == "plan9" {
cleanUpPlan9Interfaces()
}
dev, err = tun.CreateTUN(tunName, int(DefaultTUNMTU()))
}
if err != nil {
@@ -65,6 +71,36 @@ func New(logf logger.Logf, tunName string) (tun.Device, string, error) {
return dev, name, nil
}
func cleanUpPlan9Interfaces() {
maybeUnbind := func(n int) {
b, err := os.ReadFile(fmt.Sprintf("/net/ipifc/%d/status", n))
if err != nil {
return
}
status := string(b)
if !(strings.HasPrefix(status, "device maxtu ") ||
strings.Contains(status, "fd7a:115c:a1e0:")) {
return
}
f, err := os.OpenFile(fmt.Sprintf("/net/ipifc/%d/ctl", n), os.O_RDWR, 0)
if err != nil {
return
}
defer f.Close()
if _, err := fmt.Fprintf(f, "unbind\n"); err != nil {
log.Printf("unbind interface %v: %v", n, err)
return
}
log.Printf("tun: unbound stale interface %v", n)
}
// A common case: after unclean shutdown we might leave interfaces
// behind. Look for our straggler(s) and clean them up.
for n := 2; n < 5; n++ {
maybeUnbind(n)
}
}
// tunDiagnoseFailure, if non-nil, does OS-specific diagnostics of why
// TUN failed to work.
var tunDiagnoseFailure func(tunName string, logf logger.Logf, err error)