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net/tstun: implement env var for disabling UDP GRO on Linux ()

Browse Source 
Certain device drivers (e.g. vxlan, geneve) do not properly handle
coalesced UDP packets later in the stack, resulting in packet loss.

Updates 

Signed-off-by: Jordan Whited <jordan@tailscale.com>
This commit is contained in:
Jordan Whited 2024-04-30 09:14:02 -07:00 committed by GitHub
parent ec04c677c0
commit a47ce618bd
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
5 changed files with 39 additions and 3 deletions

2
go.mod

@ -76,7 +76,7 @@ require (
github.com/tailscale/peercred v0.0.0-20240214030740-b535050b2aa4
github.com/tailscale/web-client-prebuilt v0.0.0-20240226180453-5db17b287bf1
github.com/tailscale/wf v0.0.0-20240214030419-6fbb0a674ee6
github.com/tailscale/wireguard-go v0.0.0-20240413175505-64040e66467d
github.com/tailscale/wireguard-go v0.0.0-20240429185444-03c5a0ccf754
github.com/tailscale/xnet v0.0.0-20240117122442-62b9a7c569f9
github.com/tc-hib/winres v0.2.1
github.com/tcnksm/go-httpstat v0.2.0

4
go.sum

@ -886,8 +886,8 @@ github.com/tailscale/web-client-prebuilt v0.0.0-20240226180453-5db17b287bf1 h1:t
github.com/tailscale/web-client-prebuilt v0.0.0-20240226180453-5db17b287bf1/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 v0.0.0-20240413175505-64040e66467d h1:IREg0cn4nDyMjnqTgPacjgl66qDYmoOnt1k/vb96ius=
github.com/tailscale/wireguard-go v0.0.0-20240413175505-64040e66467d/go.mod h1:BOm5fXUBFM+m9woLNBoxI9TaBXXhGNP50LX/TGIvGb4=
github.com/tailscale/wireguard-go v0.0.0-20240429185444-03c5a0ccf754 h1:iazWjqVHE6CbNam7WXRhi33Qad5o7a8LVYgVoILpZdI=
github.com/tailscale/wireguard-go v0.0.0-20240429185444-03c5a0ccf754/go.mod h1:BOm5fXUBFM+m9woLNBoxI9TaBXXhGNP50LX/TGIvGb4=
github.com/tailscale/xnet v0.0.0-20240117122442-62b9a7c569f9 h1:81P7rjnikHKTJ75EkjppvbwUfKHDHYk6LJpO5PZy8pA=
github.com/tailscale/xnet v0.0.0-20240117122442-62b9a7c569f9/go.mod h1:orPd6JZXXRyuDusYilywte7k094d7dycXXU5YnWsrwg=
github.com/tc-hib/winres v0.2.1 h1:YDE0FiP0VmtRaDn7+aaChp1KiF4owBiJa5l964l5ujA=

3
net/tstun/tun.go

@ -53,6 +53,9 @@ func New(logf logger.Logf, tunName string) (tun.Device, string, error) {
dev.Close()
return nil, "", err
}
if err := setLinkFeatures(dev); err != nil {
logf("setting link features: %v", err)
}
if err := setLinkAttrs(dev); err != nil {
logf("setting link attributes: %v", err)
}

19
net/tstun/tun_features_linux.go Normal file

@ -0,0 +1,19 @@
// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package tstun
import (
"github.com/tailscale/wireguard-go/tun"
"tailscale.com/envknob"
)
func setLinkFeatures(dev tun.Device) error {
if envknob.Bool("TS_TUN_DISABLE_UDP_GRO") {
linuxDev, ok := dev.(tun.LinuxDevice)
if ok {
linuxDev.DisableUDPGRO()
}
}
return nil
}

14
net/tstun/tun_features_notlinux.go Normal file

@ -0,0 +1,14 @@
// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
//go:build !linux
package tstun
import (
"github.com/tailscale/wireguard-go/tun"
)
func setLinkFeatures(dev tun.Device) error {
return nil
}