96bc7664f2
Adds an opt-in, in-memory aggregator of recent connection-rejection events (TSMP rejects received from peers, outbound TSMP rejects we emit on ACL-blocked inbound flows, and pendopen timeouts) keyed by (direction, proto, peer-address, reason). The aggregated data is exposed over a new debug-rejects LocalAPI endpoint and a GET /debug/rejects c2n endpoint, intended for future GUI/CLI consumption when diagnosing why a connection failed. Architecture: - net/connreject holds the data types and a per-LocalBackend Aggregator (LRU-bounded, default 256 entries on desktop / 32 on mobile, per direction). - feature/connreject is a self-registering ipnext.Extension that owns one Aggregator per LocalBackend, installs note callbacks on the tundev and engine, subscribes to OnSelfChange to flip the runtime gate, and serves the LocalAPI/c2n endpoints. - wgengine.Engine and *tstun.Wrapper each gain a SetConnRejectNote setter; data-plane sites use a single atomic.Pointer load + nil check, so the cost when no consumer is installed is one MOV. Gating: - Compile-time: ts_omit_connreject build tag (standard feature/buildfeatures + condregister plumbing). Trims ~41 KB. - Runtime: tailcfg.NodeAttrConnReject node attribute, off by default at the control plane. May be removed once the feature is enabled by default. Updates CapabilityVersion to 139 (clients understand NodeAttrConnReject and can serve GET /debug/rejects). Adds Proto/Src/Dst accessors on flowtrack.Tuple (used by pendopen to construct events without exposing the tuple's internals to the aggregator). Updates #1094 Updates #14802 Signed-off-by: James Tucker <james@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.