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Andrew Dunham c5abbcd4b4 wgengine/netstack: add a per-client limit for in-flight TCP forwards This is a fun one. Right now, when a client is connecting through a subnet router, here's roughly what happens: 1. The client initiates a connection to an IP address behind a subnet router, and sends a TCP SYN 2. The subnet router gets the SYN packet from netstack, and after running through acceptTCP, starts DialContext-ing the destination IP, without accepting the connection¹ 3. The client retransmits the SYN packet a few times while the dial is in progress, until either... 4. The subnet router successfully establishes a connection to the destination IP and sends the SYN-ACK back to the client, or... 5. The subnet router times out and sends a RST to the client. 6. If the connection was successful, the client ACKs the SYN-ACK it received, and traffic starts flowing As a result, the notification code in forwardTCP never notices when a new connection attempt is aborted, and it will wait until either the connection is established, or until the OS-level connection timeout is reached and it aborts. To mitigate this, add a per-client limit on how many in-flight TCP forwarding connections can be in-progress; after this, clients will see a similar behaviour to the global limit, where new connection attempts are aborted instead of waiting. This prevents a single misbehaving client from blocking all other clients of a subnet router by ensuring that it doesn't starve the global limiter. Also, bump the global limit again to a higher value. ¹ We can't accept the connection before establishing a connection to the remote server since otherwise we'd be opening the connection and then immediately closing it, which breaks a bunch of stuff; see #5503 for more details. Updates tailscale/corp#12184 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: I76e7008ddd497303d75d473f534e32309c8a5144		2 years ago
.bencher	bencher: add config to suppress failures on benchmark regressions.	4 years ago
.github	.github/workflows: fix typo in XDG_CACHE_HOME	2 years ago
appc	appc: optimize dns response observation for large route tables	2 years ago
atomicfile	various: add golangci-lint, fix issues (#7905 )	3 years ago
chirp	all: update copyright and license headers	3 years ago
client	client/web: use grants on web UI frontend	2 years ago
clientupdate	clientupdate: disable auto update on NixOS (#11136 )	2 years ago
cmd	cmd/k8s-operator: reconcile tailscale Ingresses when their backend Services change. (#11255 )	2 years ago
control	all: remove LenIter, use Go 1.22 range-over-int instead	2 years ago
derp	cmd/derper, derp, tailcfg: add admission controller URL option	2 years ago
disco	disco: correct noun for nacl box type in disco docs	2 years ago
docs	cmd/k8s-operator/deploy: allow modifying operator tags via Helm values	2 years ago
doctor	doctor/ethtool, ipn/ipnlocal: add ethtool bugreport check	2 years ago
envknob	client/web: show features based on platform support	2 years ago
health	health: warn about reverse path filtering and exit nodes	2 years ago
hostinfo	hostinfo: fix a couple of logic simplification lints	2 years ago
internal/tooldeps	various: add golangci-lint, fix issues (#7905 )	3 years ago
ipn	ipn/ipnstate, wgengine/wgint: add handshake attempts accessors	2 years ago
jsondb	all: update copyright and license headers	3 years ago
k8s-operator	cmd/k8s-operator,k8s-operator,go.{mod,sum},tstest/tools: add Tailscale Kubernetes operator API docs (#11246 )	2 years ago
kube	cmd/k8s-operator,ipn/store/kubestore: patch secrets instead of updating	2 years ago
licenses	licenses: update win/apple licenses	2 years ago
log	tailcfg: move LogHeapPprof from Debug to c2n [capver 69]	2 years ago
logpolicy	logpolicy: allow longer idle log upload connections	2 years ago
logtail	tailscale/logtail: redact public ipv6 and ipv4 ip addresses within tailscaled. (#10531 )	2 years ago
metrics	metrics: add missing comma in histogram JSON export	2 years ago
net	health: warn about reverse path filtering and exit nodes	2 years ago
packages/deb	go.mod: upgrade nfpm to v2 (#8786 )	2 years ago
paths	safesocket, paths: add Plan 9 support	2 years ago
portlist	all: cleanup unused code, part 2 (#10670 )	2 years ago
posture	ci: run 'go vet' in golangci-lint; fix errors in tests	2 years ago
prober	prober: add TLS probe constructor to split dial addr from cert name	2 years ago
proxymap	wgengine, proxymap: split out port mapping from Engine to new type	2 years ago
release	cmd/dist: update logs for synology builds	2 years ago
safesocket	safesocket: detect macsys from within tailscaled	2 years ago
scripts	scripts/installer.sh: auto-start tailscale on Alpine (#11214 )	2 years ago
smallzstd	all: update copyright and license headers	3 years ago
ssh/tailssh	all: use reflect.TypeFor now available in Go 1.22 (#11078 )	2 years ago
syncs	Fix potential goroutine leak in syncs/watchdog.go	2 years ago
tailcfg	tailcfg: add latitude, longitude for node location (#11162 )	2 years ago
taildrop	all: use new AppendEncode methods available in Go 1.22 (#11079 )	2 years ago
tailfs	tailfs: fix race condition in tailfs_test	2 years ago
tempfork	all: use Go 1.21 slices, maps instead of x/exp/{slices,maps}	2 years ago
tka	all: use new AppendEncode methods available in Go 1.22 (#11079 )	2 years ago
tool	tool/gocross: pass flags for visionOS and visionOS Simulator (#11127 )	2 years ago
tsconst	all: update copyright and license headers	3 years ago
tsd	tailfs: clean up naming and package structure	2 years ago
tsnet	all: remove LenIter, use Go 1.22 range-over-int instead	2 years ago
tstest	cmd/k8s-operator,k8s-operator,go.{mod,sum},tstest/tools: add Tailscale Kubernetes operator API docs (#11246 )	2 years ago
tstime	tstime/rate: implement Value.{Marshal,Unmarshal}JSON (#8481 )	2 years ago
tsweb	Revert "tsweb: update ServeMux matching to 1.22.0 syntax (#11090 )" (#11125 )	2 years ago
types	types/key: remove copy returning array by value	2 years ago
util	util/syspolicy: add 'ResetToDefaults' (#11194 )	2 years ago
version	version/mkversion: allow version override with $TS_VERSION_OVERRIDE (#10799 )	2 years ago
wf	go.mod, all: move away from inet.af domain seized by Taliban	2 years ago
wgengine	wgengine/netstack: add a per-client limit for in-flight TCP forwards	2 years ago
words	words: add a list of things you should yahoo!	2 years ago
.gitattributes	.: add .gitattributes entry to use Go hunk-header driver	4 years ago
.gitignore	client/web: always use new web client; remove old client	2 years ago
.golangci.yml	ci: run 'go vet' in golangci-lint; fix errors in tests	2 years ago
ALPINE.txt	ALPINE.txt,Dockerfile{.base},build_docker.sh: bump alpine (#10543 )	2 years ago
AUTHORS	Move Linux client & common packages into a public repo.	6 years ago
CODEOWNERS	CODEOWNERS: add the start of an owners file	2 years ago
CODE_OF_CONDUCT.md	Add a code of conduct.	6 years ago
Dockerfile	Dockerfile: use Go 1.22	2 years ago
Dockerfile.base	ALPINE.txt,Dockerfile{.base},build_docker.sh: bump alpine (#10543 )	2 years ago
LICENSE	all: update tools that manage copyright headers	3 years ago
Makefile	Makefile,build_docker.sh: allow to configure target platform. (#10806 )	2 years ago
PATENTS	Move Linux client & common packages into a public repo.	6 years ago
README.md	go.mod, README.md: use Go 1.22	2 years ago
SECURITY.md	Add a SECURITY.md for vulnerability reports.	6 years ago
VERSION.txt	VERSION.txt: this is v1.61.0	2 years ago
api.md	api.md: add docs for setting an IP address	2 years ago
build_dist.sh	client/web: switch to using prebuilt web client assets	2 years ago
build_docker.sh	Makefile,build_docker.sh: allow to configure target platform. (#10806 )	2 years ago
flake.lock	flake.nix: build tailscale with go 1.22	2 years ago
flake.nix	go.mod.sri: update SRI hash for go.mod changes	2 years ago
go.mod	cmd/k8s-operator,k8s-operator,go.{mod,sum},tstest/tools: add Tailscale Kubernetes operator API docs (#11246 )	2 years ago
go.mod.sri	go.mod.sri: update SRI hash for go.mod changes	2 years ago
go.sum	cmd/k8s-operator,k8s-operator,go.{mod,sum},tstest/tools: add Tailscale Kubernetes operator API docs (#11246 )	2 years ago
go.toolchain.branch	go.toolchain.rev: bump to Go 1.22.0 (#11055 )	2 years ago
go.toolchain.rev	go.toolchain.rev: bump to Go 1.22.0 (#11055 )	2 years ago
gomod_test.go	go.mod: add test that replace directives aren't added in oss	2 years ago
header.txt	cmd/k8s-operator: operator can create subnetrouter (#9505 )	2 years ago
pull-toolchain.sh	pull-toolchain.sh: don't run update-flake.sh	3 years ago
shell.nix	go.mod.sri: update SRI hash for go.mod changes	2 years ago
staticcheck.conf	all: cleanup unused code, part 2 (#10670 )	2 years ago
update-flake.sh	.github/workflows: add workflow to update go.mod Nix SRI hash	3 years ago
version-embed.go	version: return correct Meta.MajorMinorPatch in non-dev builds	3 years ago
version_test.go	go.mod,wgengine/netstack: bump gvisor	2 years ago

README.md

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:

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 1.22. (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 git log for our commit message style. It's basically the same as Go's style.

About Us

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

Legal

WireGuard is a registered trademark of Jason A. Donenfeld.