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Author	SHA1	Message	Date
Josh Bleecher Snyder	6f23087175	wgengine/magicsock: unify initial bind and rebind ... We had two separate code paths for the initial UDP listener bind and any subsequent rebinds. IPv6 got left out of the rebind code. Rather than duplicate it there, unify the two code paths. Then improve the resulting code: * Rebind had nested listen attempts to try the user-specified port first, and then fall back to :0 if that failed. Convert that into a loop. * Initial bind tried only the user-specified port. Rebind tried the user-specified port and 0. But there are actually three ports of interest: The one the user specified, the most recent port in use, and 0. We now try all three in order, as appropriate. * In the extremely rare case in which binding to port 0 fails, use a dummy net.PacketConn whose reads block until close. This will keep the wireguard-go receive func goroutine alive. As a pleasant side-effect of this, if we decide that we need to resuscitate #1796, it will now be much easier. Fixes #1799 Co-authored-by: David Anderson <danderson@tailscale.com> Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>	4 years ago
Josh Bleecher Snyder	3c7898728d	wgengine/magicsock: remove DefaultPort const ... Assume it'll stay at 0 forever, so hard-code it and delete code conditional on it being non-0. Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>	4 years ago
Josh Bleecher Snyder	cc3d753a53	wgengine/magicsock: remove context arg from listenPacket ... It was set to context.Background by all callers, for the same reasons. Set it locally instead, to simplify call sites. Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>	4 years ago
Brad Fitzpatrick	3c9dea85e6	wgengine: update a log line from 'weird' to conventional 'unexpected' ... Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	3bdc9e9cb2	ipn/ipnlocal: prevent a now-expected [unexpected] log message on Windows ... Updates #1620 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Ross Zurowski	b062ac5e86	cmd/tailscale: fix typo in error message (#1807) ... Signed-off-by: Ross Zurowski <ross@rosszurowski.com>	4 years ago
Brad Fitzpatrick	5ecc7c7200	cmd/tailscale: make the new 'up' errors prettier and more helpful ... Fixes #1746 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Josh Bleecher Snyder	744de615f1	health, wgenegine: fix receive func health checks for the fourth time ... The old implementation knew too much about how wireguard-go worked. As a result, it missed genuine problems that occurred due to unrelated bugs. This fourth attempt to fix the health checks takes a black box approach. A receive func is healthy if one (or both) of these conditions holds: * It is currently running and blocked. * It has been executed recently. The second condition is required because receive functions are not continuously executing. wireguard-go calls them and then processes their results before calling them again. There is a theoretical false positive if wireguard-go go takes longer than one minute to process the results of a receive func execution. If that happens, we have other problems. Updates #1790 Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>	4 years ago
Josh Bleecher Snyder	0d4c8cb2e1	health: delete ReceiveFunc health checks ... They were not doing their job. They need yet another conceptual re-think. Start by clearing the decks. Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>	4 years ago
Josh Bleecher Snyder	99705aa6b7	net/tstun: split TUN events channel into up/down and MTU ... We had a long-standing bug in which our TUN events channel was being received from simultaneously in two places. The first is wireguard-go. At wgengine/userspace.go:366, we pass e.tundev to wireguard-go, which starts a goroutine (RoutineTUNEventReader) that receives from that channel and uses events to adjust the MTU and bring the device up/down. At wgengine/userspace.go:374, we launch a goroutine that receives from e.tundev, logs MTU changes, and triggers state updates when up/down changes occur. Events were getting delivered haphazardly between the two of them. We don't really want wireguard-go to receive the up/down events; we control the state of the device explicitly by calling device.Up. And the userspace.go loop MTU logging duplicates logging that wireguard-go does when it received MTU updates. So this change splits the single TUN events channel into up/down and other (aka MTU), and sends them to the parties that ought to receive them. I'm actually a bit surprised that this hasn't caused more visible trouble. If a down event went to wireguard-go but the subsequent up event went to userspace.go, we could end up with the wireguard-go device disappearing. I believe that this may also (somewhat accidentally) be a fix for #1790. Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>	4 years ago
David Anderson	97d2fa2f56	net/dns: work around WSL DNS implementation flaws. ... Fixes tailscale/corp#1662 Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
Brad Fitzpatrick	ffe6c8e335	cmd/tailscale/cli: don't do a simple up when in state NeedsLogin ... Fixes #1780 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	138921ae40	ipn/ipnlocal: always write files to partial files, even in buffered mode ... The intention was always that files only get written to *.partial files and renamed at the end once fully received, but somewhere in the process that got lost in buffered mode and *.partial files were only being used in direct receive mode. This fix prevents WaitingFiles from returning files that are still being transferred. Updates tailscale/corp#1626 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	5e268e6153	ipn/ipnlocal: use delete marker files to work around Windows delete problems ... If DeleteFile fails on Windows due to another process (anti-virus, probably) having our file open, instead leave a marker file that the file is logically deleted, and remove it from API calls and clean it up lazily later. Updates tailscale/corp#1626 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Avery Pennarun	a7fe1d7c46	wgengine/bench: improved rate selection. ... The old decay-based one took a while to converge. This new one (based very loosely on TCP BBR) seems to converge quickly on what seems to be the best speed. Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>	4 years ago
Avery Pennarun	a92b9647c5	wgengine/bench: speed test for channels, sockets, and wireguard-go. ... This tries to generate traffic at a rate that will saturate the receiver, without overdoing it, even in the event of packet loss. It's unrealistically more aggressive than TCP (which will back off quickly in case of packet loss) but less silly than a blind test that just generates packets as fast as it can (which can cause all the CPU to be absorbed by the transmitter, giving an incorrect impression of how much capacity the total system has). Initial indications are that a syscall about every 10 packets (TCP bulk delivery) is roughly the same speed as sending every packet through a channel. A syscall per packet is about 5x-10x slower than that. The whole tailscale wireguard-go + magicsock + packet filter combination is about 4x slower again, which is better than I thought we'd do, but probably has room for improvement. Note that in "full" tailscale, there is also a tundev read/write for every packet, effectively doubling the syscall overhead per packet. Given these numbers, it seems like read/write syscalls are only 25-40% of the total CPU time used in tailscale proper, so we do have significant non-syscall optimization work to do too. Sample output: $ GOMAXPROCS=2 go test -bench . -benchtime 5s ./cmd/tailbench goos: linux goarch: amd64 pkg: tailscale.com/cmd/tailbench cpu: Intel(R) Core(TM) i7-4785T CPU @ 2.20GHz BenchmarkTrivialNoAlloc/32-2 56340248 93.85 ns/op 340.98 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTrivialNoAlloc/124-2 57527490 99.27 ns/op 1249.10 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTrivialNoAlloc/1024-2 52537773 111.3 ns/op 9200.39 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTrivial/32-2 41878063 135.6 ns/op 236.04 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTrivial/124-2 41270439 138.4 ns/op 896.02 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTrivial/1024-2 36337252 154.3 ns/op 6635.30 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkBlockingChannel/32-2 12171654 494.3 ns/op 64.74 MB/s 0 %lost 1791 B/op 0 allocs/op BenchmarkBlockingChannel/124-2 12149956 507.8 ns/op 244.17 MB/s 0 %lost 1792 B/op 1 allocs/op BenchmarkBlockingChannel/1024-2 11034754 528.8 ns/op 1936.42 MB/s 0 %lost 1792 B/op 1 allocs/op BenchmarkNonlockingChannel/32-2 8960622 2195 ns/op 14.58 MB/s 8.825 %lost 1792 B/op 1 allocs/op BenchmarkNonlockingChannel/124-2 3014614 2224 ns/op 55.75 MB/s 11.18 %lost 1792 B/op 1 allocs/op BenchmarkNonlockingChannel/1024-2 3234915 1688 ns/op 606.53 MB/s 3.765 %lost 1792 B/op 1 allocs/op BenchmarkDoubleChannel/32-2 8457559 764.1 ns/op 41.88 MB/s 5.945 %lost 1792 B/op 1 allocs/op BenchmarkDoubleChannel/124-2 5497726 1030 ns/op 120.38 MB/s 12.14 %lost 1792 B/op 1 allocs/op BenchmarkDoubleChannel/1024-2 7985656 1360 ns/op 752.86 MB/s 13.57 %lost 1792 B/op 1 allocs/op BenchmarkUDP/32-2 1652134 3695 ns/op 8.66 MB/s 0 %lost 176 B/op 3 allocs/op BenchmarkUDP/124-2 1621024 3765 ns/op 32.94 MB/s 0 %lost 176 B/op 3 allocs/op BenchmarkUDP/1024-2 1553750 3825 ns/op 267.72 MB/s 0 %lost 176 B/op 3 allocs/op BenchmarkTCP/32-2 11056336 503.2 ns/op 63.60 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTCP/124-2 11074869 533.7 ns/op 232.32 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkTCP/1024-2 8934968 671.4 ns/op 1525.20 MB/s 0 %lost 0 B/op 0 allocs/op BenchmarkWireGuardTest/32-2 1403702 4547 ns/op 7.04 MB/s 14.37 %lost 467 B/op 3 allocs/op BenchmarkWireGuardTest/124-2 780645 7927 ns/op 15.64 MB/s 1.537 %lost 420 B/op 3 allocs/op BenchmarkWireGuardTest/1024-2 512671 11791 ns/op 86.85 MB/s 0.5206 %lost 411 B/op 3 allocs/op PASS ok tailscale.com/wgengine/bench 195.724s Updates #414. Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>	4 years ago
Maisem Ali	590792915a	wgengine/router{win}: ignore broadcast routes added by Windows when removing routes. ... Signed-off-by: Maisem Ali <maisem@tailscale.com>	4 years ago
David Anderson	f6b7d08aea	net/dns: work around new NetworkManager in other selection paths. ... Further bits of #1788 Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	25ce9885a2	net/dns: don't use NM+resolved for NM >=1.26.6. ... NetworkManager fixed the bug that forced us to use NetworkManager if it's programming systemd-resolved, and in the same release also made NetworkManager ignore DNS settings provided for unmanaged interfaces... Which breaks what we used to do. So, with versions 1.26.6 and above, we MUST NOT use NetworkManager to indirectly program systemd-resolved, but thankfully we can talk to resolved directly and get the right outcome. Fixes #1788 Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	31f81b782e	util/cmpver: move into OSS from corp repo. ... Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
Aleksandar Pesic	7c985e4944	ipn/ipnlocal: add file sharing to windows shell ... Updates: tailscale/winmin#33 Signed-off-by: Aleksandar Pesic <peske.nis@gmail.com>	4 years ago
Brad Fitzpatrick	e41075dd4a	net/interfaces: work around race fetching routing table ... Fixes #1345 Updates golang/go#45736 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	fe53a714bd	ipn/ipnlocal: add a LocalBackend.Start fast path if already running ... Updates tailscale/corp#1621 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	ad1a595a75	ipn/ipnlocal: close peer API listeners on transition away from Running ... Updates tailscale/corp#1621 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	d94ed7310b	cmd/tailscale/cli: add test for already-submitted #1777 ... Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Josh Bleecher Snyder	8d7f7fc7ce	health, wgenegine: fix receive func health checks yet again ... The existing implementation was completely, embarrassingly conceptually broken. We aren't able to see whether wireguard-go's receive function goroutines are running or not. All we can do is model that based on what we have done. This commit fixes that model. Fixes #1781 Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>	4 years ago
David Anderson	30f5d706a1	net/dns/resolver: remove unnecessary/racy WaitGroup. ... Fixes #1663 Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
Brad Fitzpatrick	8a449c4dcd	ipn: define NewBackendServer nil as not affecting Backend's NotifyCallback ... Updates tailscale/corp#1646 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
David Anderson	30629c430a	cmd/tailscale/cli: don't force an interactive login on --reset. ... Fixes #1778 Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	36d030cc36	ipn/ipnlocal: use fallback default DNS whenever exit nodes are on. ... Fixes #1625 Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
David Anderson	67ba6aa9fd	cmd/tailscale/cli: fix typo in ExitNodeID mapping. ... Prevented turning off exit nodes. Fixes #1777 Signed-off-by: David Anderson <danderson@tailscale.com>	4 years ago
Brad Fitzpatrick	86e85d8934	ipn/ipnlocal: add peerapi goroutine fetch ... Between owners. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Josh Bleecher Snyder	5835a3f553	health, wgengine/magicsock: avoid receive function false positives ... Avery reported a sub-ms health transition from "receiveIPv4 not running" to "ok". To avoid these transient false-positives, be more precise about the expected lifetime of receive funcs. The problematic case is one in which they were started but exited prior to a call to connBind.Close. Explicitly represent started vs running state, taking care with the order of updates. Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>	4 years ago
Brad Fitzpatrick	3411bb959a	control/controlclient: fix signRegisterRequest log suppression check on Windows ... Fixes #1774 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	2d786821f6	ipn/ipnlocal: put a retry loop around Windows file deletes ... oh, Windows. Updates tailscale/corp#1626 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	11780a4503	cmd/tailscale: only send file basename in push ... Fixes #1640 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Josh Bleecher Snyder	f845aae761	health: track whether magicsock receive functions are running ... Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>	4 years ago
Brad Fitzpatrick	529ef98b2a	ipn/ipnlocal: fix approxSize operator precedence ... Whoops. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	820952daba	cmd/tailscale: don't print out old authURL on up --force-reauth ... Fixes #1671 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	12b4672add	wgengine: quiet connection failure diagnostics for exit nodes ... The connection failure diagnostic code was never updated enough for exit nodes, so disable its misleading output when the node it picks (incorrectly) to diagnose is only an exit node. Fixes #1754 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	b03c23d2ed	ipn/ipnlocal: log on DeleteFile error ... Updates tailscale/corp#1626 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	6f52fa02a3	control/controlclient, tailcfg: add Debug.SleepSeconds (mapver 19) ... Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	c91a22c82e	cmd/tailscale: don't print auth URL when using a --authkey ... Fixes #1755 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	e40e5429c2	cmd/tailscale/cli: make 'tailscale up' protect --advertise-exit-node removal ... The new "tailscale up" checks previously didn't protect against --advertise-exit-node being omitted in the case that --advertise-routes was also provided. It wasn't done before because there is no corresponding pref for "--advertise-exit-node"; it's a helper flag that augments --advertise-routes. But that's an implementation detail and we can still help users. We just have to special case that pref and look whether the current routes include both the v4 and v6 /0 routes. Fixes #1767 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	a16eb6ac41	cmd/tailscale/cli: show online/offline status in push --file-targets ... Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	dedbd483ea	cmd/tailscale/cli: don't require explicit --operator if it matches $USER ... This doesn't make --operator implicit (which we might do in the future), but it at least doesn't require repeating it in the future when it already matches $USER. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	2f17a34242	ipn/ipnlocal: fix tailscale status --json AuthURL field ... It was getting cleared on notify. Document that authURL is cleared on notify and add a new field that isn't, using the new field for the JSON status. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	09891b9868	ipn/ipnlocal: on fresh lazy-connecting install, start in state NeedsLogin ... Fixes #1759 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Josh Bleecher Snyder	a29b0cf55f	wgengine/wglog: allow wireguard-go receive routines to log ... I've spent two days searching for a theoretical wireguard-go bug around receive functions exiting early. I've found many bugs, but none of the flavor we're looking for. Restore wireguard-go's logging around starting and stopping receive functions, so that we can definitively rule in or out this particular theory. Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>	4 years ago
Josh Bleecher Snyder	eb2a9d4ce3	wgengine/netstack: log error when acceptUDP fails ... I see a bunch of these in some logs I'm looking at, separated only by a few seconds. Log the error so we can tell what's going on here. Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>	4 years ago