a058d04afb
Add a new `tailscale set` flag that allows incoming WAN connections on specified proto:port pairs to bypass exit node routing. When a node uses an exit node, reply traffic for externally-initiated connections gets captured by the exit node's default route, breaking any service the machine hosts on its public IP but preserving privacy. This flag installs port-specific conntrack-based firewall rules that marks replies to matching inbound connections with the Tailscale bypass fwmark (0x80000), causing them to route through the main table instead of the exit node tunnel. Usage: tailscale set --exit-node-allow-wan-ports=tcp:22,tcp:443 --accept-risk=wan-bypass For each proto:port entry, two firewall rules are created: - mangle/PREROUTING: tags connections on non-tailscale interfaces for the specified destination port with the bypass conntrack mark. Matches all connection states (not just NEW) so existing connections get tagged when rules are installed after an exit node is activated. - mangle/OUTPUT: sets the bypass fwmark on ESTABLISHED/RELATED replies (matched by source port) so they route via the physical interface WAN bypass rules are installed before routes in the router's Set() method to avoid a window where the exit node route is active but no bypass rules exist, which would drop existing connections. Implements both iptables and nftables backends. The nftables OUTPUT rules use a separate chain (ts-wan-bypass) with ChainTypeRoute to trigger re-routing when the packet mark changes. Also fixes a pre-existing byte-order bug in the nftables backend where mark-related helper functions (getTailscaleFwmarkMask, etc.) used hardcoded big-endian byte arrays instead of native byte order. On little-endian systems (all x86), the nftables Bitwise expressions operated on the wrong bits, making the connmark save/restore rules (rp_filter workaround) silently ineffective. Changed all mark byte helpers to use binary.NativeEndian. Updates #10940 Signed-off-by: Mike O'Driscoll <mikeo@tailscale.com>
Tailscale
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:
- the Android app is at https://github.com/tailscale/tailscale-android
- the Synology package is at https://github.com/tailscale/tailscale-synology
- the QNAP package is at https://github.com/tailscale/tailscale-qpkg
- the Chocolatey packaging is at https://github.com/tailscale/tailscale-chocolatey
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:
- https://github.com/tailscale/tailscale/graphs/contributors
- https://github.com/tailscale/tailscale-android/graphs/contributors
Legal
WireGuard is a registered trademark of Jason A. Donenfeld.