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net/tstun: implement env var for disabling UDP GRO on Linux (#11924)

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

Updates #11026

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
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GPG Key ID: B5690EEEBB952194
5 changed files with 39 additions and 3 deletions
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2
go.mod
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@ -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
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@ -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
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@ -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
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@ -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
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@ -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
}