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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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4
cmd/tailscaled/tailscaled.go
View File

@ -82,7 +82,9 @@ func defaultTunName() string {
// "utun" is recognized by wireguard-go/tun/tun_darwin.go
// as a magic value that uses/creates any free number.
return "utun"
case "plan9", "aix", "solaris", "illumos":
case "plan9":
return "auto"
case "aix", "solaris", "illumos":
return "userspace-networking"
case "linux":
switch distro.Get() {

2
go.mod
View File

@ -85,7 +85,7 @@ require (
github.com/tailscale/setec v0.0.0-20250205144240-8898a29c3fbb
github.com/tailscale/web-client-prebuilt v0.0.0-20250124233751-d4cd19a26976
github.com/tailscale/wf v0.0.0-20240214030419-6fbb0a674ee6
github.com/tailscale/wireguard-go v0.0.0-20250107165329-0b8b35511f19
github.com/tailscale/wireguard-go v0.0.0-20250304000100-91a0587fb251
github.com/tailscale/xnet v0.0.0-20240729143630-8497ac4dab2e
github.com/tc-hib/winres v0.2.1
github.com/tcnksm/go-httpstat v0.2.0

4
go.sum
View File

@ -924,8 +924,8 @@ github.com/tailscale/web-client-prebuilt v0.0.0-20250124233751-d4cd19a26976 h1:U
github.com/tailscale/web-client-prebuilt v0.0.0-20250124233751-d4cd19a26976/go.mod h1:agQPE6y6ldqCOui2gkIh7ZMztTkIQKH049tv8siLuNQ=
github.com/tailscale/wf v0.0.0-20240214030419-6fbb0a674ee6 h1:l10Gi6w9jxvinoiq15g8OToDdASBni4CyJOdHY1Hr8M=
github.com/tailscale/wf v0.0.0-20240214030419-6fbb0a674ee6/go.mod h1:ZXRML051h7o4OcI0d3AaILDIad/Xw0IkXaHM17dic1Y=
github.com/tailscale/wireguard-go v0.0.0-20250107165329-0b8b35511f19 h1:BcEJP2ewTIK2ZCsqgl6YGpuO6+oKqqag5HHb7ehljKw=
github.com/tailscale/wireguard-go v0.0.0-20250107165329-0b8b35511f19/go.mod h1:BOm5fXUBFM+m9woLNBoxI9TaBXXhGNP50LX/TGIvGb4=
github.com/tailscale/wireguard-go v0.0.0-20250304000100-91a0587fb251 h1:h/41LFTrwMxB9Xvvug0kRdQCU5TlV1+pAMQw0ZtDE3U=
github.com/tailscale/wireguard-go v0.0.0-20250304000100-91a0587fb251/go.mod h1:BOm5fXUBFM+m9woLNBoxI9TaBXXhGNP50LX/TGIvGb4=
github.com/tailscale/xnet v0.0.0-20240729143630-8497ac4dab2e h1:zOGKqN5D5hHhiYUp091JqK7DPCqSARyUfduhGUY8Bek=
github.com/tailscale/xnet v0.0.0-20240729143630-8497ac4dab2e/go.mod h1:orPd6JZXXRyuDusYilywte7k094d7dycXXU5YnWsrwg=
github.com/tc-hib/winres v0.2.1 h1:YDE0FiP0VmtRaDn7+aaChp1KiF4owBiJa5l964l5ujA=

2
net/tstun/tstun_stub.go
View File

@ -1,7 +1,7 @@
// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
//go:build plan9 || aix || solaris || illumos
//go:build aix || solaris || illumos
package tstun

38
net/tstun/tun.go
View File

@ -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)

11
wgengine/userspace.go
View File

@ -569,6 +569,17 @@ func (e *userspaceEngine) handleLocalPackets(p *packet.Parsed, t *tstun.Wrapper)
return filter.Drop
}
}
if runtime.GOOS == "plan9" {
isLocalAddr, ok := e.isLocalAddr.LoadOk()
if ok {
if isLocalAddr(p.Dst.Addr()) {
// On Plan9's "tun" equivalent, everything goes back in and out
// the tun, even when the kernel's replying to itself.
t.InjectInboundCopy(p.Buffer())
return filter.Drop
}
}
}
return filter.Accept
}