Simon Law 93dbd33ef7 ipn/ipnlocal: stub system interfaces for TestShouldUseOneCGNATRoute (#19807)
The TestShouldUseOneCGNATRoute test fails when the underlying system
interfaces don’t match what the underlying assumptions of the test.
That assumption was that there would only ever be one CGNAT interface:
the Tailscale one.

This breaks on Linux when border0 is installed because border0 also
creates an interface with a CGNAT route.

This patch stubs netmon.RegisterInterfaceGetter to replace the system
interfaces and netmon.SetTailscaleInterfaceProps to identify the test
data that defines the Tailscale interface.

This patch also tests the control knob override for CGNAT for every
combination of operating system and system interfaces, instead of just
a couple of combinations.

Fixes #19731

Signed-off-by: Simon Law <sfllaw@tailscale.com>
2026-05-20 16:00:14 -07:00
2026-05-14 21:04:41 -07:00
2026-03-27 08:41:33 +00:00
2026-01-27 16:15:17 -08:00

Tailscale

https://tailscale.com

Private WireGuard® networks made easy

Overview

This repository contains the majority of Tailscale's open source code. Notably, it includes the tailscaled daemon and the tailscale CLI tool. The tailscaled daemon runs on Linux, Windows, macOS, and to varying degrees on FreeBSD and OpenBSD. The Tailscale iOS and Android apps use this repo's code, but this repo doesn't contain the mobile GUI code.

Other Tailscale repos of note:

For background on which parts of Tailscale are open source and why, see https://tailscale.com/opensource/.

Using

We serve packages for a variety of distros and platforms at https://pkgs.tailscale.com.

Other clients

The macOS, iOS, and Windows clients use the code in this repository but additionally include small GUI wrappers. The GUI wrappers on non-open source platforms are themselves not open source.

Building

We always require the latest Go release, currently Go 1.26. (While we build releases with our Go fork, its use is not required.)

go install tailscale.com/cmd/tailscale{,d}

If you're packaging Tailscale for distribution, use build_dist.sh instead, to burn commit IDs and version info into the binaries:

./build_dist.sh tailscale.com/cmd/tailscale
./build_dist.sh tailscale.com/cmd/tailscaled

If your distro has conventions that preclude the use of build_dist.sh, please do the equivalent of what it does in your distro's way, so that bug reports contain useful version information.

Bugs

Please file any issues about this code or the hosted service on the issue tracker.

Contributing

PRs welcome! But please file bugs. Commit messages should reference bugs.

We require Developer Certificate of Origin Signed-off-by lines in commits.

See commit-messages.md (or skim git log) for our commit message style.

About Us

Tailscale is primarily developed by the people at https://github.com/orgs/tailscale/people. For other contributors, see:

WireGuard is a registered trademark of Jason A. Donenfeld.

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