Brad Fitzpatrick
ee029383f7
If people ran derper on a multi-NIC or multi-address host, STUN replies could go out from the wrong address. The wildcard UDP socket let the kernel pick the reply's source address by routing to the client, which means the default route's address rather than the one the request came in on. With connmark-based policy routing (e.g. DNAT through a tunnel), the reply then doesn't match the inbound conntrack entry, goes out the wrong interface, and the client never sees it. DERP over TCP was fine, since accepted sockets are pinned to the local address. Add net/pktinfo, a small Linux-only package that uses IP_PKTINFO and IPV6_RECVPKTINFO to learn each datagram's destination address and to reply from it, and use it in the STUN server. Only the source address is pinned; routing still picks the interface. Other platforms are unchanged. Fixes #21404 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> Change-Id: I7b3e9c2d41a8f60e5d9c1b2a3f4e5d6c7b8a9f01
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 1.27. (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.