tailscale

Commit Graph

Author	SHA1	Message	Date
slowy07	ac0353e982	fix: typo spelling grammar Signed-off-by: slowy07 <slowy.arfy@gmail.com>	3 years ago
David Crawshaw	0ac2130590	net/dns: resolveConfExists reading the wrong error Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	3 years ago
Brad Fitzpatrick	36ffd509de	net/dns: avoid Linux PolicyKit GUI dialog during tests Fixes #2672 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Maisem Ali	1f006025c2	net/tstun: fix build on arm Signed-off-by: Maisem Ali <maisem@tailscale.com>	3 years ago
Brad Fitzpatrick	cd426eaf4c	net/portmapper: fix t.Log-after-test-done race in tests Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Matt Layher	8ab44b339e	net/tstun: use unix.Ifreq type for Linux TAP interface configuration Signed-off-by: Matt Layher <mdlayher@gmail.com>	3 years ago
Josh Bleecher Snyder	a24cee0d67	all: simplify ts_macext build tags Now that we have the easier-to-parse go:build build tags, it is straightforward to simplify them. Yay. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Brad Fitzpatrick	833200da6f	net/tstun: don't exec uname -r on Linux in TUN failure diagnostics Fixes https://twitter.com/zekjur/status/1425557520513486848 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	e804ab29fd	net/tstun: move TUN failure diagnostics to OS-specific files Mostly so the Linux one can use Linux-specific stuff in package syscall and not use os/exec for uname for portability. But also it helps deps a tiny bit on iOS. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
julianknodt	b9bd7dbc5d	net/portmapper: log upnp information This logs some basic statistics for UPnP, so that tailscale can better understand what routers are being used and how to connect to them. Signed-off-by: julianknodt <julianknodt@gmail.com>	3 years ago
julianknodt	26b6fe7f02	net/portmapper: add PCP integration test This adds a PCP test to the IGD test server, by hardcoding in a few observed packets from Denton's box. Signed-off-by: julianknodt <julianknodt@gmail.com>	3 years ago
Brad Fitzpatrick	bdb93c5942	net/portmapper: actually test something in TestProbeIntegration And use dynamic port numbers in tests, as Linux on GitHub Actions and Windows in general have things running on these ports. Co-Author: Julian Knodt <julianknodt@gmail.com> Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Adrian Dewhurst	8bdf878832	net/dns/resolver: use forwarded dns txid directly Previously, we hashed the question and combined it with the original txid which was useful when concurrent queries were multiplexed on a single local source port. We encountered some situations where the DNS server canonicalizes the question in the response (uppercase converted to lowercase in this case), which resulted in responses that we couldn't match to the original request due to hash mismatches. This includes a new test to cover that situation. Fixes #2597 Signed-off-by: Adrian Dewhurst <adrian@tailscale.com>	3 years ago
Brad Fitzpatrick	e6d4ab2dd6	net/portmapper: add start of self-contained portmapper integration tests Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
julianknodt	98d36ee18d	net/portmapper: add hook for use with prev ip PCP handles external IPs by allowing the client to specify them in the packet, which is more explicit than requiring 2 packets from PMP, so allow for future changes to add it in easily. Signed-off-by: julianknodt <julianknodt@gmail.com>	3 years ago
julianknodt	85304d7392	net/portmapper: check disable flags Signed-off-by: julianknodt <julianknodt@gmail.com>	3 years ago
julianknodt	777b711d96	net/portmapper: add pcp portmapping This adds PCP portmapping, hooking into the existing PMP portmapping. Signed-off-by: julianknodt <julianknodt@gmail.com>	3 years ago
julianknodt	5c98b1b8d0	net/portmapper: move pcp code to separate file This moves all the PCP code to a separate file in preparation for portmapping with PCP. Signed-off-by: julianknodt <julianknodt@gmail.com>	3 years ago
Josh Bleecher Snyder	a5da4ed981	all: gofmt with Go 1.17 This adds "//go:build" lines and tidies up existing "// +build" lines. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Brad Fitzpatrick	a729070252	net/tstun: add start of Linux TAP support, with DHCP+ARP server Still very much a prototype (hard-coded IPs, etc) but should be non-invasive enough to submit at this point and iterate from here. Updates #2589 Co-Author: David Crawshaw <crawshaw@tailscale.com> Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	fdc081c291	net/portmapper: fix UPnP probing, work against all ports Prior to Tailscale 1.12 it detected UPnP on any port. Starting with Tailscale 1.11.x, it stopped detecting UPnP on all ports. Then start plumbing its discovered Location header port number to the code that was assuming port 5000. Fixes #2109 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Denton Gentry	260b85458c	net/dns: correct log message. Signed-off-by: Denton Gentry <dgentry@tailscale.com>	3 years ago
Brad Fitzpatrick	54e33b511a	net/dns/resolver: add test that I forgot to git add earlier This was meant to be part of `53a2f63658` earlier but I guess I failed at git. Updates #2436 Updates tailscale/corp#2250 Updates tailscale/corp#2238 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	be921d1a95	net/dns/resolver: fix skipped DoH test that bitrot Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	5a7ff2b231	net/dnsfallback: re-run go generate	3 years ago
Matt Layher	effee49e45	net/interfaces: explicitly check netaddr.IP.Is6 in isUsableV6 Signed-off-by: Matt Layher <mdlayher@gmail.com>	3 years ago
Matt Layher	3ff8a55fa7	net/tsaddr: remove IsULA, replace with netaddr.IP.IsPrivate Signed-off-by: Matt Layher <mdlayher@gmail.com>	3 years ago
Josh Bleecher Snyder	c2202cc27c	net/tstun: use mono.Time There's a call to Now once per packet. Move to mono.Now. Though the current implementation provides high precision, we document it to be coarse, to preserve the ability to switch to a coarse monotonic time later. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Josh Bleecher Snyder	881bb8bcdc	net/dns/resolver: allow an extra alloc for go closure allocation Go 1.17 switches to a register ABI on amd64 platforms. Part of that switch is that go and defer calls use an argument-less closure, which allocates. This means that we have an extra alloc in some DNS work. That's unfortunate but not a showstopper, and I don't see a clear path to fixing it. The other performance benefits from the register ABI will all but certainly outweigh this extra alloc. Fixes #2545 Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Brad Fitzpatrick	b6179b9e83	net/dnsfallback: add new nodes Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
David Crawshaw	f414a9cc01	net/dns/resolver: EDNS OPT record off-by-one I don't know how to get access to a real packet. Basing this commit entirely off: +------------+--------------+------------------------------+ \| Field Name \| Field Type \| Description \| +------------+--------------+------------------------------+ \| NAME \| domain name \| MUST be 0 (root domain) \| \| TYPE \| u_int16_t \| OPT (41) \| \| CLASS \| u_int16_t \| requestor's UDP payload size \| \| TTL \| u_int32_t \| extended RCODE and flags \| \| RDLEN \| u_int16_t \| length of all RDATA \| \| RDATA \| octet stream \| {attribute,value} pairs \| +------------+--------------+------------------------------+ From https://datatracker.ietf.org/doc/html/rfc6891#section-6.1.2 Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	3 years ago
Josh Bleecher Snyder	1034b17bc7	net/tstun: buffer outbound channel The handoff between tstun.Wrap's Read and poll methods is one of the per-packet hotspots. It shows up in pprof. Making outbound buffered increases throughput. It is hard to measure exactly how much, because the numbers are highly variable, but I'd estimate it at about 1%, using the best observed max throughput across three runs. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Josh Bleecher Snyder	965dccd4fc	net/tstun: buffer outbound channel The handoff between tstun.Wrap's Read and poll methods is one of the per-packet hotspots. It shows up in pprof. Making outbound buffered increases throughput. It is hard to measure exactly how much, because the numbers are highly variable, but I'd estimate it at about 1%, using the best observed max throughput across three runs. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Brad Fitzpatrick	68df379a7d	net/portmapper: rename ErrGatewayNotFound to ErrGatewayRange, reword text It confused & scared people. And it was just bad. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	aaf2df7ab1	net/{dnscache,interfaces}: use netaddr.IP.IsPrivate, delete copied code Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	c17d743886	net/dnscache: update a comment Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	281d503626	net/dnscache: make Dialer try all resolved IPs Tested manually with: $ go test -v ./net/dnscache/ -dial-test=bogusplane.dev.tailscale.com:80 Where bogusplane has three A records, only one of which works. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	e299300b48	net/dnscache: cache all IPs per hostname Not yet used in the dialer, but plumbed around. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	53a2f63658	net/dns/resolver: race well-known resolvers less aggressively Instead of blasting away at all upstream resolvers at the same time, make a timing plan upon reconfiguration and have each upstream have an associated start delay, depending on the overall forwarding config. So now if you have two or four upstream Google or Cloudflare DNS servers (e.g. two IPv4 and two IPv6), we now usually only send a query, not four. This is especially nice on iOS where we start fewer DoH queries and thus fewer HTTP/1 requests (because we still disable HTTP/2 on iOS), fewer sockets, fewer goroutines, and fewer associated HTTP buffers, etc, saving overall memory burstiness. Fixes #2436 Updates tailscale/corp#2250 Updates tailscale/corp#2238 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	e94ec448a7	net/dns/resolver: add forwardQuery type as race work prep Add a place to hang state in a future change for #2436. For now this just simplifies the send signature without any functional change. Updates #2436 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	064b916b1a	net/dns/resolver: fix func used as netaddr.IP in printf Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	7b295f3d21	net/portmapper: disable UPnP on iOS for now Updates #2495 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	cecfc14875	net/dns: don't build init*.go on non-windows To remove the regexp dep on iOS, notably. Updates tailscale/corp#2238 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	2968893add	net/dns/resolver: bound DoH usage on iOS Updates tailscale/corp#2238 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	3daf27eaad	net/dns/resolver: fall back to IPv6 for well-known DoH servers if v4 fails Should help with IPv6-only environments when the tailnet admin only specified IPv4 DNS IPs. See https://github.com/tailscale/tailscale/issues/2447#issuecomment-884188562 Co-Author: Adrian Dewhurst <adrian@tailscale.com> Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	74eee4de1c	net/dns/resolver: use correct Cloudflare DoH hostnames We were using the wrong ones for the malware & adult content variants. Docs: https://developers.cloudflare.com/1.1.1.1/1.1.1.1-for-families/setup-instructions/dns-over-https Earlier commit which added them: `236eb4d04d` Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
julianknodt	3a4201e773	net/portmapper: return correct upnp port Previously, this was incorrectly returning the internal port, and using that with the external exposed IP when it did not use WANIPConnection2. In the case when we must provide a port, we return it instead. Noticed this while implementing the integration test for upnp. Signed-off-by: julianknodt <julianknodt@gmail.com>	3 years ago
Brad Fitzpatrick	e74d37d30f	net/dns{,/resolver}: quiet DNS output logging It was a huge chunk of the overall log output and made debugging difficult. Omit and summarize the spammy *.arpa parts instead. Fixes tailscale/corp#2066 (to which nobody had opinions, so)	3 years ago
Josh Bleecher Snyder	84a6dcd9a9	net/dnsfallback: regenerate Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Brad Fitzpatrick	171ec9f8f4	control/{controlknobs,controlclient}: simplify knobs API, fix controlclient crash From integration tests elsewhere: panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x70 pc=0x845c9b] goroutine 226 [running]: tailscale.com/control/controlclient.(Direct).sendMapRequest(0xc00053e1e0, 0x16670f0, 0xc000353780, 0xffffffffffffffff, 0xc0003e5f10, 0x0, 0x0) /home/runner/go/pkg/mod/tailscale.com@v1.1.1-0.20210715222212-1bb6abc604c1/control/controlclient/direct.go:803 +0x19bb tailscale.com/control/controlclient.(Direct).PollNetMap(...) /home/runner/go/pkg/mod/tailscale.com@v1.1.1-0.20210715222212-1bb6abc604c1/control/controlclient/direct.go:574 tailscale.com/control/controlclient.(Auto).mapRoutine(0xc00052a1e0) /home/runner/go/pkg/mod/tailscale.com@v1.1.1-0.20210715222212-1bb6abc604c1/control/controlclient/auto.go:464 +0x571 created by tailscale.com/control/controlclient.(Auto).Start /home/runner/go/pkg/mod/tailscale.com@v1.1.1-0.20210715222212-1bb6abc604c1/control/controlclient/auto.go:151 +0x65 exit status 2 Also remove types/opt.Bool API addition which is now unnecessary. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
julianknodt	1bb6abc604	net/portmapper: add upnp port mapping Add in UPnP portmapping, using goupnp library in order to get the UPnP client and run the portmapping functions. This rips out anywhere where UPnP used to be in portmapping, and has a flow separate from PMP and PCP. RELNOTE=portmapper now supports UPnP mappings Fixes #682 Updates #2109 Signed-off-by: julianknodt <julianknodt@gmail.com>	3 years ago
Brad Fitzpatrick	236eb4d04d	net/dns/resolver: upgrade forwarded MagicDNS queries to DoH when IP known Recognize Cloudflare, Google, Quad9 which are by far the majority of upstream DNS servers that people use. RELNOTE=MagicDNS now uses DNS-over-HTTPS when querying popular upstream resolvers, so DNS queries aren't sent in the clear over the Internet. Updates #915 (might fix it?) Updates #988 (gets us closer, if it fixes Android) Updates #74 (not yet configurable, but progress) Updates #2056 (not yet configurable, dup of #74?) Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Aaditya Chaudhary	4f89fe17a2	Implemented Commandline Download Speedtest (#2064 ) Added the net/speedtest package that contains code for starting up a speedtest server and a client. The speedtest command for starting a client takes in a duration for the speedtest as well as the host and port of the speedtest server to connect to. The speedtest command for starting a server takes in a host:port pair to listen on. Signed-off-by: Aaditya Chaudhary <32117362+AadityaChaudhary@users.noreply.github.com>	3 years ago
Denton Gentry	e28bc49e5f	netns_linux: remove special handling for tests. With netns handling localhost now, existing tests no longer need special handling. The tests set up their connections to localhost, and the connections work without fuss. Remove the special handling for tests. Also remove the hostinfo.TestCase support, since this was the only use of it. It can be added back later if really needed, but it would be better to try to make tests work without special cases. Signed-off-by: Denton Gentry <dgentry@tailscale.com>	3 years ago
Denton Gentry	d2480fd508	net/netns: support !CAP_NET_ADMIN netns_linux checked whether "ip rule" could run to determine whether to use SO_MARK for network namespacing. However in Linux environments which lack CAP_NET_ADMIN, such as various container runtimes, the "ip rule" command succeeds but SO_MARK fails due to lack of permission. SO_BINDTODEVICE would work in these environments, but isn't tried. In addition to running "ip rule" check directly whether SO_MARK works or not. Among others, this allows Microsoft Azure App Service and AWS App Runner to work. Signed-off-by: Denton Gentry <dgentry@tailscale.com>	3 years ago
Denton Gentry	1896bf99d9	netns_linux: No namespace for localhost. Connections to a control server or log server on localhost, used in a number of tests, are working right now because the calls to SO_MARK in netns fail for non-root but then we ignore the failure when running in tests. Unfortunately that failure in SO_MARK also affects container environments without CAP_NET_ADMIN, breaking Tailscale connectivity. We're about to fix netns to recognize when SO_MARK doesn't work and use SO_BINDTODEVICE instead. Doing so makes tests fail, as their sockets now BINDTODEVICE of the default route and cannot connect to localhost. Add support to skip namespacing for localhost connections, which Darwin and Windows already do. This is not conditional on running within a test, if you tell tailscaled to connect to localhost it will automatically use a non-namespaced socket to do so. Signed-off-by: Denton Gentry <dgentry@tailscale.com>	3 years ago
Denton Gentry	61622b18fa	net/interface: add AWS App Runner /proc/net/route test Signed-off-by: Denton Gentry <dgentry@tailscale.com>	3 years ago
Brad Fitzpatrick	92077ae78c	wgengine/magicsock: make portmapping async Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	440566c5d2	net/interfaces: trim getPACWindows whitespace before parsing URL Fixes #2357 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Josh Bleecher Snyder	0ad92b89a6	net/tstun: fix data races To remove some multi-case selects, we intentionally allowed sends on closed channels (`cc23049cd2`). However, we also introduced concurrent sends and closes, which is a data race. This commit fixes the data race. The mutexes here are uncontended, and thus very cheap. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Josh Bleecher Snyder	c35a832de6	net/tstun: add inner loop to poll This avoids re-enqueuing to t.bufferConsumed, which makes the code a bit clearer. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Josh Bleecher Snyder	a4cc7b6d54	net/tstun: simplify code Calculate whether the packet is injected directly, rather than via an else branch. Unify the exit paths. It is easier here than duplicating them. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Josh Bleecher Snyder	cc23049cd2	net/tstun: remove multi-case selects from hot code Every TUN Read went through several multi-case selects. We know from past experience with wireguard-go that these are slow and cause scheduler churn. The selects served two purposes: they separated errors from data and gracefully handled shutdown. The first is fairly easy to replace by sending errors and data over a single channel. The second, less so. We considered a few approaches: Intricate webs of channels, global condition variables. They all get ugly fast. Instead, let's embrace the ugly and handle shutdown ungracefully. It's horrible, but the horror is simple and localized. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
David Crawshaw	6b9f8208f4	net/dns: do not run wsl.exe as LocalSystem It doesn't work. It needs to run as the user. https://github.com/microsoft/WSL/issues/4803 The mechanism for doing this was extracted from: https://web.archive.org/web/20101009012531/http://blogs.msdn.com/b/winsdk/archive/2009/07/14/launching-an-interactive-process-from-windows-service-in-windows-vista-and-later.aspx While here, we also reclaculate WSL distro set on SetDNS. This accounts for: 1. potential inability to access wsl.exe on startup 2. WSL being installed while Tailscale is running 3. A new WSL distrobution being installed Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	3 years ago
David Crawshaw	1147c7fd4f	net/dns: set WSL /etc/resolv.conf We also have to make a one-off change to /etc/wsl.conf to stop every invocation of wsl.exe clobbering the /etc/resolv.conf. This appears to be a safe change to make permanently, as even though the resolv.conf is constantly clobbered, it is always the same stable internal IP that is set as a nameserver. (I believe the resolv.conf clobbering predates the MS stub resolver.) Tested on WSL2, should work for WSL1 too. Fixes #775 Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	3 years ago
David Crawshaw	9b063b86c3	net/dns: factor directManager out over an FS interface This is preliminary work for using the directManager as part of a wslManager on windows, where in addition to configuring windows we'll use wsl.exe to edit the linux file system and modify the system resolv.conf. The pinholeFS is a little funky, but it's designed to work through simple unix tools via wsl.exe without invoking bash. I would not have thought it would stand on its own like this, but it turns out it's useful for writing a test for the directManager. Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	3 years ago
Brad Fitzpatrick	15677d8a0e	net/socks5/tssocks: add a SOCKS5 dialer type, method-ifying code https://twitter.com/bradfitz/status/1409605220376580097 Prep for #1970, #2264, #2268 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	3910c1edaf	net/socks5/tssocks: add new package, move SOCKS5 glue out of tailscaled Prep for #1970, #2264, #2268 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
David Crawshaw	d6f4b5f5cb	ipn, etc: use controlplane.tailscale.com Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	3 years ago
julianknodt	72a0b5f042	net/dns/resolver: fmt item This has been bothering me for a while, but everytime I run format from the root directory it also formats this file. I didn't want to add it to my other PRs but it's annoying to have to revert it every time. Signed-off-by: julianknodt <julianknodt@gmail.com>	3 years ago
Brad Fitzpatrick	10d7c2583c	net/dnsfallback: don't depend on derpmap.Prod Move derpmap.Prod to a static JSON file (go:generate'd) instead, to make its role explicit. And add a TODO about making dnsfallback use an update-over-time DERP map file instead of a baked-in one. Updates #1264 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
David Crawshaw	80b1308974	net/dns: remove ref to managerImpl Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	3 years ago
Adrian Dewhurst	bcaae3e074	net/dns/resolver: clamp EDNS size This change (subject to some limitations) looks for the EDNS OPT record in queries and responses, clamping the size field to fit within our DNS receive buffer. If the size field is smaller than the DNS receive buffer then it is left unchanged. I think we will eventually need to transition to fully processing the DNS queries to handle all situations, but this should cover the most common case. Mostly fixes #2066 Signed-off-by: Adrian Dewhurst <adrian@tailscale.com>	3 years ago
Brad Fitzpatrick	7b8ed1fc09	net/netns: add Android implementation, allowing registration of JNI hook Updates #2102 Updates #1809 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	3d777c13b0	net/socks5: fix a typo Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
David Anderson	084d48d22d	net/dns: always proxy through quad-100 on windows 8.1. Windows 8.1 incorrectly handles search paths on an interface with no associated resolver, so we have to provide a full primary DNS config rather than use Windows 8.1's nascent-but-present NRPT functionality. Fixes #2237. Signed-off-by: David Anderson <danderson@tailscale.com>	3 years ago
Brad Fitzpatrick	45e64f2e1a	net/dns{,/resolver}: refactor DNS forwarder, send out of right link on macOS/iOS Fixes #2224 Fixes tailscale/corp#2045 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Brad Fitzpatrick	733d52827b	net/dns/resolver: skip test on macOS Fixes #2229 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
Denton Gentry	ad288baaea	net/interfaces: use IPv4 link local if nothing better The only connectivity an AWS Lambda container has is an IPv4 link-local 169.254.x.x address using NAT: 12: vtarget_1@if11: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000 link/ether 7e:1c:3f:00:00:00 brd ff:ff:ff:ff:ff:ff link-netnsid 1 inet 169.254.79.1/32 scope global vtarget_1 valid_lft forever preferred_lft forever If there are no other IPv4/v6 addresses available, and we are running in AWS Lambda, allow IPv4 169.254.x.x addresses to be used. ---- Similarly, a Google Cloud Run container's only connectivity is a Unique Local Address fddf:3978:feb1:d745::c001/128. If there are no other addresses available then allow IPv6 Unique Local Addresses to be used. We actually did this in an earlier release, but now refactor it to work the same way as the IPv4 link-local support is being done. Signed-off-by: Denton Gentry <dgentry@tailscale.com>	3 years ago
David Crawshaw	297b3d6fa4	staticcheck.conf: turn off noisy lint errors Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	3 years ago
Brad Fitzpatrick	1ae35b6c59	net/{interfaces,netcheck}: rename some fields, funcs Split out of Denton's #2164, to make that diff smaller to review. This change has no behavior changes. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	3 years ago
David Anderson	9337826011	net/dns: fix inverted test for NetworkManager version. Signed-off-by: David Anderson <danderson@tailscale.com>	3 years ago
David Anderson	320cc8fa21	net/dns: verify that systemd-resolved is actually in charge. It's possible to install a configuration that passes our current checks for systemd-resolved, without actually pointing to systemd-resolved. In that case, we end up programming DNS in resolved, but that config never applies to any name resolution requests on the system. This is quite a far-out edge case, but there's a simple additional check we can do: if the header comment names systemd-resolved, there should be a single nameserver in resolv.conf pointing to 127.0.0.53. If not, the configuration should be treated as an unmanaged resolv.conf. Fixes #2136. Signed-off-by: David Anderson <danderson@tailscale.com>	3 years ago
David Anderson	e7164425b3	net/dns: don't use NetworkManager for DNS on very old NetworkManagers. Fixes #1945. Signed-off-by: David Anderson <danderson@tailscale.com>	3 years ago
Dave Anderson	144c68b80b	net/dns: avoid using NetworkManager as much as possible. (#1945 ) Addresses #1699 as best as possible. Signed-off-by: David Anderson <danderson@tailscale.com>	3 years ago
Adrian Dewhurst	8b11937eaf	net/dns/resolver: permit larger max responses, signal truncation This raises the maximum DNS response message size from 512 to 4095. This should be large enough for almost all situations that do not need TCP. We still do not recognize EDNS, so we will still forward requests that claim support for a larger response size than 4095 (that will be solved later). For now, when a response comes back that is too large to fit in our receive buffer, we now set the truncation flag in the DNS header, which is an improvement from before but will prompt attempts to use TCP which isn't supported yet. On Windows, WSARecvFrom into a buffer that's too small returns an error in addition to the data. On other OSes, the extra data is silently discarded. In this case, we prefer the latter so need to catch the error on Windows. Partially addresses #1123 Signed-off-by: Adrian Dewhurst <adrian@tailscale.com>	3 years ago
David Anderson	7fab244614	net/dns/resolver: don't spam logs on EHOSTUNREACH. Fixes #1719. Signed-off-by: David Anderson <danderson@tailscale.com>	3 years ago
David Anderson	df8a5d09c3	net/tstun: add a debug envvar to override tun MTU. Signed-off-by: David Anderson <dave@natulte.net>	4 years ago
Brad Fitzpatrick	713c5c9ab1	net/{interfaces,netns}: change which build tag means mac/ios Network/System Extension We used to use "redo" for that, but it was pretty vague. Also, fix the build tags broken in interfaces_default_route_test.go from `a9745a0b68`, moving those Linux-specific tests to interfaces_linux_test.go. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	a321c24667	go.mod: update netaddr Involves minor IPSetBuilder.Set API change. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	ca455ac84b	net/tsaddr: simplify TailscaleServiceIP netaddr allocated at the time this was written. No longer. name old time/op new time/op delta TailscaleServiceAddr-4 5.46ns ± 4% 1.83ns ± 3% -66.52% (p=0.008 n=5+5) A bunch of the others can probably be simplified too, but this was the only one with just an IP and not an IPPrefix. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Josh Bleecher Snyder	1ece91cede	go.mod: upgrade wireguard-windows, de-fork wireguard-go Pull in the latest version of wireguard-windows. Switch to upstream wireguard-go. This requires reverting all of our import paths. Unfortunately, this has to happen at the same time. The wireguard-go change is very low risk, as that commit matches our fork almost exactly. (The only changes are import paths, CI files, and a go.mod entry.) So if there are issues as a result of this commit, the first place to look is wireguard-windows changes. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	5666663370	net/packet: use netaddr AppendTo methods This lets us remote the types/strbuilder package, which had only a single user. And it's faster. name old time/op new time/op delta String/tcp4-8 175ns ± 0% 58ns ± 1% -66.95% (p=0.000 n=10+9) String/tcp6-8 226ns ± 1% 136ns ± 1% -39.85% (p=0.000 n=10+10) String/udp4-8 175ns ± 1% 58ns ± 1% -67.01% (p=0.000 n=10+9) String/udp6-8 230ns ± 1% 140ns ± 0% -39.32% (p=0.000 n=10+9) String/icmp4-8 164ns ± 0% 50ns ± 1% -69.89% (p=0.000 n=10+10) String/icmp6-8 217ns ± 1% 129ns ± 0% -40.46% (p=0.000 n=10+10) String/igmp-8 196ns ± 0% 56ns ± 1% -71.32% (p=0.000 n=10+10) String/unknown-8 2.06ns ± 1% 2.06ns ± 2% ~ (p=0.985 n=10+10) name old alloc/op new alloc/op delta String/tcp4-8 32.0B ± 0% 32.0B ± 0% ~ (all equal) String/tcp6-8 168B ± 0% 96B ± 0% -42.86% (p=0.000 n=10+10) String/udp4-8 32.0B ± 0% 32.0B ± 0% ~ (all equal) String/udp6-8 168B ± 0% 96B ± 0% -42.86% (p=0.000 n=10+10) String/icmp4-8 32.0B ± 0% 32.0B ± 0% ~ (all equal) String/icmp6-8 104B ± 0% 64B ± 0% -38.46% (p=0.000 n=10+10) String/igmp-8 48.0B ± 0% 48.0B ± 0% ~ (all equal) String/unknown-8 0.00B 0.00B ~ (all equal) name old allocs/op new allocs/op delta String/tcp4-8 1.00 ± 0% 1.00 ± 0% ~ (all equal) String/tcp6-8 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.000 n=10+10) String/udp4-8 1.00 ± 0% 1.00 ± 0% ~ (all equal) String/udp6-8 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.000 n=10+10) String/icmp4-8 1.00 ± 0% 1.00 ± 0% ~ (all equal) String/icmp6-8 3.00 ± 0% 1.00 ± 0% -66.67% (p=0.000 n=10+10) String/igmp-8 1.00 ± 0% 1.00 ± 0% ~ (all equal) String/unknown-8 0.00 0.00 ~ (all equal) Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	d6d1951897	net/packet: add BenchmarkString Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
David Anderson	e2dcf63420	net/dns: replace AuthoritativeSuffixes with nil Route entries. This leads to a cleaner separation of intent vs. implementation (Routes is now the only place specifying who handles DNS requests), and allows for cleaner expression of a configuration that creates MagicDNS records without serving them to the OS. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	6690f86ef4	net/dns: always offer MagicDNS records at 100.100.100.100. Fixes #1886. Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
Josh Bleecher Snyder	25df067dd0	all: adapt to opaque netaddr types This commit is a mishmash of automated edits using gofmt: gofmt -r 'netaddr.IPPort{IP: a, Port: b} -> netaddr.IPPortFrom(a, b)' -w . gofmt -r 'netaddr.IPPrefix{IP: a, Port: b} -> netaddr.IPPrefixFrom(a, b)' -w . gofmt -r 'a.IP.Is4 -> a.IP().Is4' -w . gofmt -r 'a.IP.As16 -> a.IP().As16' -w . gofmt -r 'a.IP.Is6 -> a.IP().Is6' -w . gofmt -r 'a.IP.As4 -> a.IP().As4' -w . gofmt -r 'a.IP.String -> a.IP().String' -w . And regexps: \w(.)\.Port = (.) -> $1 = $1.WithPort($2) \w(.)\.IP = (.) -> $1 = $1.WithIP($2) And lots of manual fixups. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
David Anderson	cfde997699	net/dns: don't use interfaces.Tailscale to find the tailscale interface index. interfaces.Tailscale only returns an interface if it has at least one Tailscale IP assigned to it. In the resolved DNS manager, when we're called upon to tear down DNS config, the interface no longer has IPs. Instead, look up the interface index on construction and reuse it throughout the daemon lifecycle. Fixes #1892. Signed-off-by: David Anderson <dave@natulte.net>	4 years ago
Brad Fitzpatrick	3173c5a65c	net/interface: remove darwin fetchRoutingTable workaround Fixed upstream. Bump dep. Updates #1345 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
David Anderson	3c8e230ee1	Revert "net/dns: set IPv4 auto mode in NM, so it lets us set DNS." This reverts commit `7d16c8228b`. I have no idea how I ended up here. The bug I was fixing with this change fails to reproduce on Ubuntu 18.04 now, and this change definitely does break 20.04, 20.10, and Debian Buster. So, until we can reliably reproduce the problem this was meant to fix, reverting. Part of #1875 Signed-off-by: David Anderson <dave@natulte.net>	4 years ago

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