Commit Graph

1133 Commits

Author SHA1 Message Date
nicksherron
f01ff18b6f all: fix spelling mistakes
Signed-off-by: nicksherron <nsherron90@gmail.com>
2021-10-12 21:23:14 -07:00
Avery Pennarun
0d4a0bf60e magicsock: if STUN failed to send before, rebind before STUNning again.
On iOS (and possibly other platforms), sometimes our UDP socket would
get stuck in a state where it was bound to an invalid interface (or no
interface) after a network reconfiguration. We can detect this by
actually checking the error codes from sending our STUN packets.

If we completely fail to send any STUN packets, we know something is
very broken. So on the next STUN attempt, let's rebind the UDP socket
to try to correct any problems.

This fixes a problem where iOS would sometimes get stuck using DERP
instead of direct connections until the backend was restarted.

Fixes #2994

Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
2021-10-08 02:17:09 +09:00
David Anderson
830f641c6b wgengine/magicsock: update discokeys on netmap change.
Fixes #3008.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-10-06 14:52:47 -07:00
Brad Fitzpatrick
29a8fb45d3 wgengine/netstack: include DNS.ExtraRecords in DNSMap
So SOCKS5 dialer can dial HTTPS cert names, for instance.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-09-28 10:01:36 -07:00
Brad Fitzpatrick
52737c14ac wgengine/monitor: ignore ipsec link monitor events on iOS/macOS
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-09-27 20:45:51 -07:00
Denton Gentry
93c2882a2f wgengine: flush DNS cache after major link change.
Windows has a public dns.Flush used in router_windows.go.
However that won't work for platforms like Linux, where
we need a different flush mechanism for resolved versus
other implementations.

We're instead adding a FlushCaches method to the dns Manager,
which can be made to work on all platforms as needed.

Fixes https://github.com/tailscale/tailscale/issues/2132

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
2021-09-19 22:58:53 -07:00
Josh Bleecher Snyder
d5ab18b2e6 cmd/cloner: add Clone context to regen struct assignments
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-09-17 16:46:08 -07:00
Josh Bleecher Snyder
a722e48cef wgengine/magicsock: skip alloc test with -race
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-09-17 09:56:32 -07:00
Josh Bleecher Snyder
7693d36aed all: close fake userspace engines when tests complete
We were leaking FDs.
In a few places, switch from defer to t.Cleanup.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-09-15 15:31:51 -07:00
Josh Bleecher Snyder
4bbf5a8636 cmd/cloner: reduce diff noise when changing command
Spelling out the command to run for every type
means that changing the command makes for a large, repetitive diff.
Stop doing that.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-09-15 10:58:12 -07:00
Brad Fitzpatrick
dabeda21e0 net/tstun: block looped disco traffic
Updates #1526 (maybe fixes? time will tell)

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-09-13 16:00:28 -07:00
Brad Fitzpatrick
31c1331415 wgengine/magicsock: deflake TestReceiveFromAllocs
100 iterations isn't enough with background allocs happening
apparently. 1000 seems to be reliable.

Fixes #2826

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-09-09 11:49:44 -07:00
Brad Fitzpatrick
2238814b99 wgengine/magicsock: fix crash introduced in recent cleanups
Fixes #2801

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-09-08 08:27:51 -07:00
Brad Fitzpatrick
640134421e all: update tests to use tstest.MemLogger
And give MemLogger a mutex, as one caller had, which does match the logf
contract better.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-09-07 20:06:15 -07:00
Brad Fitzpatrick
4c68b7df7c tstest: add MemLogger bytes.Buffer wrapper with Logf method
We use it tons of places. Updated three at least in this PR.

Another use in next commit.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-09-07 15:33:45 -07:00
David Crawshaw
9502b515f1 net/dns: replace resolver IPs with type for DoH
We currently plumb full URLs for DNS resolvers from the control server
down to the client. But when we pass the values into the net/dns
package, we throw away any URL that isn't a bare IP. This commit
continues the plumbing, and gets the URL all the way to the built in
forwarder. (It stops before plumbing URLs into the OS configurations
that can handle them.)

For #2596

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
2021-09-07 14:44:26 -07:00
Brad Fitzpatrick
7bfd4f521d cmd/tailscale: fix "tailscale ip $self-host-hostname"
And in the process, fix the related confusing error messages from
pinging your own IP or hostname.

Fixes #2803

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-09-07 11:57:23 -07:00
David Anderson
efe8020dfa wgengine/magicsock: fix race condition in tests.
AFAICT this was always present, the log read mid-execution was never safe.
But it seems like the recent magicsock refactoring made the race much
more likely.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-09-05 17:42:33 -07:00
Evan Anderson
000f90d4d7 wgengine/wglog: Fix docstring on wireguardGoString to match args
@danderson linked this on Twitter and I noticed the mismatch.

Signed-off-by: Evan Anderson <evan.k.anderson@gmail.com>
2021-09-05 15:52:16 -07:00
Brad Fitzpatrick
5bacbf3744 wgengine/magicsock, health, ipn/ipnstate: track DERP-advertised health
And add health check errors to ipnstate.Status (tailscale status --json).

Updates #2746
Updates #2775

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-09-02 10:20:25 -07:00
David Anderson
daf54d1253 control/controlclient: remove TS_DEBUG_USE_DISCO=only.
It was useful early in development when disco clients were the
exception and tailscale logs were noisier than today, but now
non-disco is the exception.

Updates #2752

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-09-01 18:11:32 -07:00
David Anderson
954064bdfe wgengine/wgcfg/nmcfg: don't configure peers who can't DERP or disco.
Fixes #2770

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-09-01 18:11:32 -07:00
David Anderson
f90ac11bd8 wgengine: remove unnecessary magicConnStarted channel.
Having removed magicconn.Start, there's no need to synchronize startup
of other things to it any more.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-09-01 18:11:32 -07:00
David Anderson
bb10443edf wgengine/wgcfg: use just the hexlified node key as the WireGuard endpoint.
The node key is all magicsock needs to find the endpoint that WireGuard
needs.

Updates #2752

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-09-01 15:13:21 -07:00
David Anderson
d00341360f wgengine/magicsock: remove unused debug knob.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-09-01 15:13:21 -07:00
David Anderson
dfd978f0f2 wgengine/magicsock: use NodeKey, not DiscoKey, as the trigger for lazy reconfig.
Updates #2752

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-09-01 15:13:21 -07:00
David Anderson
4c27e2fa22 wgengine/magicsock: remove Start method from Conn.
Over time, other magicsock refactors have made Start effectively a
no-op, except that some other functions choose to panic if called
before Start.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-09-01 15:13:21 -07:00
David Anderson
1a899344bd wgengine/magicsock: don't store tailcfg.Nodes alongside endpoints.
Updates #2752

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-09-01 15:13:21 -07:00
David Anderson
b2181608b5 wgengine/magicsock: eagerly create endpoints in SetNetworkMap.
Updates #2752

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-09-01 15:13:21 -07:00
Emmanuel T Odeke
0daa32943e all: add (*testing.B).ReportAllocs() to every benchmark
This ensures that we can properly track and catch allocation
slippages that could otherwise have been missed.

Fixes #2748
2021-08-30 21:41:04 -07:00
David Anderson
44d71d1e42 wgengine/magicsock: fix race in test shutdown, again.
We were returning an error almost, but not quite like errConnClosed in
a single codepath, which could still trip the panic on reconfig in the
test logic.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-08-30 21:26:38 -07:00
David Anderson
f09ede9243 wgengine/magicsock: don't configure eager WireGuard handshaking in tests.
Our prod code doesn't eagerly handshake, because our disco layer enables
on-demand handshaking. Configuring both peers to eagerly handshake leads
to WireGuard handshake races that make TestTwoDevicePing flaky.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-08-30 17:28:12 -07:00
David Anderson
86d1c4eceb wgengine/magicsock: ignore close races even harder.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-08-30 17:09:45 -07:00
David Anderson
8bacfe6a37 wgengine/magicsock: remove unused sendLogLimit limiter.
Magicsock these days gets its logs limited by the global log limiter.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-08-30 17:09:45 -07:00
David Anderson
e151b74f93 wgengine/magicsock: remove opts.SimulatedNetwork.
It only existed to override one test-only behavior with a
different test-only behavior, in both cases working around
an annoying feature of our CI environments. Instead, handle
that weirdness entirely in the test code, with a tweaked
TestOnlyPacketListener that gets injected.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-08-30 17:09:45 -07:00
David Anderson
58c1f7d51a wgengine/magicsock: rename opts.PacketListener to TestOnlyPacketListener.
The docstring said it was meant for use in tests, but it's specifically a
special codepath that is _only_ used in tests, so make the claim stronger.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-08-30 17:09:45 -07:00
David Anderson
8049063d35 wgengine/magicsock: rename discoEndpoint to just endpoint.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-08-30 17:09:45 -07:00
David Anderson
f2d949e2db wgengine/magicsock: fold findEndpoint into its only remaining caller.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-08-30 17:09:45 -07:00
David Anderson
fe2f89deab wgengine/magicsock: fix rare shutdown race in test.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-08-30 14:33:07 -07:00
David Anderson
97693f2e42 wgengine/magicsock: delete legacy AddrSet endpoints.
Instead of using the legacy codepath, teach discoEndpoint to handle
peers that have a home DERP, but no disco key. We can still communicate
with them, but only over DERP.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-08-30 14:33:07 -07:00
David Anderson
61c62f48d9 wgengine/bench: disable unused benchmark that relies on legacy magicsock.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-08-30 14:33:07 -07:00
Maisem Ali
fd4838dc57 wgengine/userspace: add support to automatically enable/disable the tailscale
protocol in BIRD, when the node is a primary subnet router as determined
by control.

Signed-off-by: Maisem Ali <maisem@tailscale.com>
2021-08-30 10:18:05 -07:00
Brad Fitzpatrick
7fcf86a14a wgengine: fix link monitor / magicsock Start race
Fixes #2733

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-08-30 09:12:10 -07:00
Brad Fitzpatrick
83906abc5e wgengine/netstack: clarify a comment
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-08-27 11:10:56 -07:00
Brad Fitzpatrick
1925fb584e wgengine/netstack: fix crash in userspace netstack TCP forwarding
Fixes #2658

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-08-25 15:48:05 -07:00
slowy07
ac0353e982 fix: typo spelling grammar
Signed-off-by: slowy07 <slowy.arfy@gmail.com>
2021-08-24 07:55:04 -07:00
Brad Fitzpatrick
37053801bb wgengine/magicsock: restore a bit of logging on node becoming active
Fixes #2695

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-08-23 12:22:23 -07:00
Denton Gentry
6731f934a6 Revert "wgengine: actively log FlushDNS."
This log is quite verbose, it was only to be left in for one
unstable build to help debug a user issue.

This reverts commit 1dd2552032.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
2021-08-20 18:12:47 -07:00
Denton Gentry
1dd2552032 wgengine: actively log FlushDNS.
Intended to help in resolving customer issue with
DNS caching.

We currently exec `ipconfig /flushdns` from two
places:
- SetDNS(), which logs before invoking
- here in router_windows, which doesn't

We'd like to see a positive indication in logs that flushdns
is being run.

As this log is expected to be spammy, it is proposed to
leave this in just long enough to do an unstable 1.13.x build
and then revert it. They won't run an unsigned image that
I build.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
2021-08-19 14:43:14 -07:00
Josh Bleecher Snyder
6ef734e493 wgengine: predict min.Peers length across calls
The number of peers we have will be pretty stable across time.
Allocate roughly the right slice size.
This reduces memory usage when there are many peers.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-08-18 16:12:45 -07:00
Josh Bleecher Snyder
adf696172d wgengine/userspace: reduce allocations in getStatus
Two optimizations.

Use values instead of pointers.
We were using pointers to make track the "peer in progress" easier.
It's not too hard to do it manually, though.

Make two passes through the data, so that we can size our
return value accurately from the beginning.
This is cheap enough compared to the allocation,
which grows linearly in the number of peers,
that it is worth doing.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-08-18 16:12:08 -07:00
Maisem Ali
5c383bdf5d wgengine/router: pass in AmbientCaps when calling ip rule
Signed-off-by: Maisem Ali <maisem@tailscale.com>
2021-08-18 13:28:53 -07:00
Brad Fitzpatrick
39610aeb09 wgengine/magicsock: move debug knobs to their own file, compile out on iOS
No need for these knobs on iOS where you can set the environment
variables anyway.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-08-15 13:21:22 -07:00
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>
2021-08-05 15:54:00 -07:00
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>
2021-08-05 10:01:45 -07:00
Brad Fitzpatrick
f3c96df162 ipn/ipnstate: move tailscale status "active" determination to tailscaled
Fixes #2579

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-08-04 09:10:49 -07:00
Brad Fitzpatrick
b622c60ed0 derp,wgengine/magicsock: don't assume stringer is in $PATH for go:generate
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-08-01 19:14:08 -07:00
Josh Bleecher Snyder
9da4181606 tstime/rate: new package
This is a simplified rate limiter geared for exactly our needs:
A fast, mono.Time-based rate limiter for use in tstun.
It was generated by stripping down the x/time/rate rate limiter
to just our needs and switching it to use mono.Time.

It removes one time.Now call per packet.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-07-29 12:56:58 -07:00
Josh Bleecher Snyder
f6e833748b wgengine: use mono.Time
Migrate wgengine to mono.Time for performance-sensitive call sites.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-07-29 12:56:58 -07:00
Josh Bleecher Snyder
8a3d52e882 wgengine/magicsock: use mono.Time
magicsock makes multiple calls to Now per packet.
Move to mono.Now. Changing some of the calls to
use package mono has a cascading effect,
causing non-per-packet call sites to also switch.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-07-29 12:56:58 -07:00
Brad Fitzpatrick
5c266bdb73 wgengine: re-set DNS config on Linux after a major link change
Updates #2458 (maybe fixes it)

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-07-26 08:01:27 -07:00
Brad Fitzpatrick
95a9adbb97 wgengine/netstack: implement UDP relaying to advertised subnets
TCP was done in 662fbd4a09.

This does the same for UDP.

Tested by hand. Integration tests will have to come later. I'd wanted
to do it in this commit, but the SOCKS5 server needed for interop
testing between two userspace nodes doesn't yet support UDP and I
didn't want to invent some whole new userspace packet injection
interface at this point, as SOCKS seems like a better route, but
that's its own bug.

Fixes #2302

RELNOTE=netstack mode can now UDP relay to subnets

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-07-21 22:32:26 -07:00
Brad Fitzpatrick
ecac74bb65 wgengine/netstack: fix doc comment
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-07-21 08:25:05 -07:00
Brad Fitzpatrick
e4fecfe31d wgengine/{monitor,router}: restore Linux ip rules when systemd deletes them
Thanks.

Fixes #1591

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-07-20 15:52:22 -07:00
Brad Fitzpatrick
ed8587f90d wgengine/router: take a link monitor
Prep for #1591 which will need to make Linux's router react to changes
that the link monitor observes.

The router package already depended on the monitor package
transitively. Now it's explicit.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-07-20 13:43:40 -07:00
Joe Tsai
9a0c8bdd20 util/deephash: make hash type opaque
The fact that Hash returns a [sha256.Size]byte leaks details about
the underlying hash implementation. This could very well be any other
hashing algorithm with a possible different block size.

Abstract this implementation detail away by declaring an opaque type
that is comparable. While we are changing the signature of UpdateHash,
rename it to just Update to reduce stutter (e.g., deephash.Update).

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
2021-07-20 11:03:25 -07:00
Josh Bleecher Snyder
4dbbd0aa4a cmd/addlicense: add command to add licenseheaders to generated code
And use it to make our stringer invocations match the existing code.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-07-19 15:31:56 -07:00
Josh Bleecher Snyder
c179580599 wgengine/magicsock: add debug envvar to force all traffic over DERP
This would have been useful during debugging DERP issues recently.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-07-19 15:30:50 -07:00
Brad Fitzpatrick
e41193ec4d wgengine/monitor: don't spam about Linux RTM_NEWRULE events
The earlier 2ba36c294b started listening
for ip rule changes and only cared about DELRULE events, buts its subscription
included all rule events, including new ones, which meant we were then
catching our own ip rule creations and logging about how they were unknown.

Stop that log spam.

Updates #1591

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-07-19 14:30:15 -07:00
Brad Fitzpatrick
2ba36c294b wgengine/monitor: subscribe to Linux ip rule events, log on rule deletes
For debugging & working on #1591 where certain versions of systemd-networkd
delete Tailscale's ip rule entries.

Updates #1591

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-07-18 14:50:47 -07:00
Josh Bleecher Snyder
4f4dae32dd wgengine/magicsock: fix latent data race in test
logBufWriter had no serialization.
It just so happens that none of its users currently ever log concurrently.
Make it safe for concurrent use.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-07-13 15:14:18 -07:00
julianknodt
fb06ad19e7 wgcfg: Switch to using mem.RO
As Brad suggested, mem.RO allows for a lot of easy perf gains. There were also some smaller
changes outside of mem.RO, such as using hex.Decode instead of hex.DecodeString.

```
name        old time/op    new time/op    delta
FromUAPI-8    14.7µs ± 3%    12.3µs ± 4%  -16.58%  (p=0.008 n=5+5)

name        old alloc/op   new alloc/op   delta
FromUAPI-8    9.52kB ± 0%    7.04kB ± 0%  -26.05%  (p=0.008 n=5+5)

name        old allocs/op  new allocs/op  delta
FromUAPI-8      77.0 ± 0%      29.0 ± 0%  -62.34%  (p=0.008 n=5+5)
```

Signed-off-by: julianknodt <julianknodt@gmail.com>
2021-07-13 13:45:44 -07:00
julianknodt
d349a3231e wgcfg: use string cut instead of string split
Signed-off-by: julianknodt <julianknodt@gmail.com>
2021-07-13 13:45:44 -07:00
julianknodt
664edbe566 wgcfg: add benchmark for FromUAPI
Adds a benchmark for FromUAPI in wgcfg.
It appears that it's not actually that slow, the main allocations are from the scanner and new
config.
Updates #1912.

Signed-off-by: julianknodt <julianknodt@gmail.com>
2021-07-13 13:45:44 -07:00
Brad Fitzpatrick
7e7c4c1bbe tailcfg: break DERPNode.DERPTestPort into DERPPort & InsecureForTests
The DERPTestPort int meant two things before: which port to use, and
whether to disable TLS verification. Users would like to set the port
without disabling TLS, so break it into two options.

Updates #1264

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-07-09 12:30:31 -07:00
Brad Fitzpatrick
92077ae78c wgengine/magicsock: make portmapping async
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-07-09 11:15:26 -07:00
Brad Fitzpatrick
700badd8f8 util/deephash: move internal/deephash to util/deephash
No code changes. Just a minor package doc addition about lack of API
stability.
2021-07-02 21:33:02 -07:00
Maisem Ali
ec52760a3d wgengine/router_windows: support toggling local lan access when using
exit nodes.

Signed-off-by: Maisem Ali <maisem@tailscale.com>
2021-06-29 09:22:10 -07:00
Brad Fitzpatrick
722859b476 wgengine/netstack: make SOCKS5 resolve names to IPv6 if self node when no IPv4
For instance, ephemeral nodes with only IPv6 addresses can now
SOCKS5-dial out to names like "foo" and resolve foo's IPv6 address
rather than foo's IPv4 address and get a "no route"
(*tcpip.ErrNoRoute) error from netstack's dialer.

Per https://github.com/tailscale/tailscale/issues/2268#issuecomment-870027626
which is only part of the isuse.

Updates #2268

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-06-28 15:20:37 -07:00
julianknodt
506c2fe8e2 cmd/tailscale: make netcheck use active DERP map, delete static copy
After allowing for custom DERP maps, it's convenient to be able to see their latency in
netcheck. This adds a query to the local tailscaled for the current DERPMap.

Updates #1264

Signed-off-by: julianknodt <julianknodt@gmail.com>
2021-06-28 14:08:47 -07:00
Christine Dodrill
59e9b44f53
wgengine/filter: add a debug flag for filter logs (#2241)
This uses a debug envvar to optionally disable filter logging rate
limits by setting the environment variable
TS_DEBUG_FILTER_RATE_LIMIT_LOGS to "all", and if it matches,
the code will effectively disable the limits on the log rate by
setting the limit to 1 millisecond. This should make sure that all
filter logs will be captured.

Signed-off-by: Christine Dodrill <xe@tailscale.com>
2021-06-25 10:10:26 -04:00
Brad Fitzpatrick
c45bfd4180 wgengine: make dnsIPsOverTailscale also consider DefaultResolvers
Found during a failed experiment debugging something on Android.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-06-24 12:57:26 -07:00
Brad Fitzpatrick
b92e2ebd24 wgengine/netstack: add Impl.DialContextUDP
Unused so far, but eventually we'll want this for SOCKS5 UDP binds (we
currently only do TCP with SOCKS5), and also for #2102 for forwarding
MagicDNS upstream to Tailscale IPs over netstack.

Updates #2102

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-06-23 22:12:17 -07:00
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>
2021-06-23 16:04:10 -07:00
David Crawshaw
4ce15505cb wgengine: randomize client port if netmap says to
For testing out #2187

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
2021-06-23 08:51:37 -07:00
David Crawshaw
5f8ffbe166 magicsock: add SetPreferredPort method
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
2021-06-23 08:51:37 -07:00
Brad Fitzpatrick
80a4052593 cmd/tailscale, wgengine, tailcfg: don't assume LastSeen is present [mapver 20]
Updates #2107

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-06-11 08:41:16 -07:00
Fletcher Nichol
a49df5cfda wgenine/router: fix OpenBSD route creation
The route creation for the `tun` device was augmented in #1469 but
didn't account for adding IPv4 vs. IPv6 routes. There are 2 primary
changes as a result:

* Ensure that either `-inet` or `-inet6` was used in the
  [`route(8)`](https://man.openbsd.org/route) command
* Use either the `localAddr4` or `localAddr6` for the gateway argument
  depending which destination network is being added

The basis for the approach is based on the implementation from
`router_userspace_bsd.go`, including the `inet()` helper function.

Fixes #2048
References #1469

Signed-off-by: Fletcher Nichol <fnichol@nichol.ca>
2021-06-10 10:48:33 -07:00
Josh Bleecher Snyder
e92fd19484 wgengine/wglog: match upstream wireguard-go's code for wireguardGoString
It is a bit faster.

But more importantly, it matches upstream byte-for-byte,
which ensures there'll be no corner cases in which we disagree.

name        old time/op    new time/op    delta
SetPeers-8    3.58µs ± 0%    3.16µs ± 2%  -11.74%  (p=0.016 n=4+5)

name        old alloc/op   new alloc/op   delta
SetPeers-8    2.53kB ± 0%    2.53kB ± 0%     ~     (all equal)

name        old allocs/op  new allocs/op  delta
SetPeers-8      99.0 ± 0%      99.0 ± 0%     ~     (all equal)

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-06-04 13:06:28 -07:00
Brad Fitzpatrick
a321c24667 go.mod: update netaddr
Involves minor IPSetBuilder.Set API change.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-06-02 09:05:06 -07:00
Josh Bleecher Snyder
ddf6c8c729 wgengine/magicsock: delete dead code
Co-authored-by: Adrian Dewhurst <adrian@tailscale.com>
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-28 17:02:08 -07:00
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>
2021-05-25 13:18:21 -07:00
Josh Bleecher Snyder
ceaaa23962 wgengine/wglog: cache strings
We repeat many peers each time we call SetPeers.
Instead of constructing strings for them from scratch every time,
keep strings alive across iterations.

name        old time/op    new time/op    delta
SetPeers-8    3.58µs ± 1%    2.41µs ± 1%  -32.60%  (p=0.000 n=9+10)

name        old alloc/op   new alloc/op   delta
SetPeers-8    2.53kB ± 0%    1.30kB ± 0%  -48.73%  (p=0.000 n=10+10)

name        old allocs/op  new allocs/op  delta
SetPeers-8      99.0 ± 0%      16.0 ± 0%  -83.84%  (p=0.000 n=10+10)

We could reduce alloc/op 12% and allocs/op 23% if strs had
type map[string]strCache instead of map[string]*strCache,
but that wipes out the execution time impact.
Given that re-use is the most common scenario, let's optimize for it.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-24 18:41:54 -07:00
Josh Bleecher Snyder
73adbb7a78 wgengine: pass an addressable value to deephash.UpdateHash
This makes deephash more efficient.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-24 13:51:23 -07:00
Josh Bleecher Snyder
8bf2a38f29 go.mod: update wireguard-go, taking control over iOS memory usage from our fork
Our wireguard-go fork used different values from upstream for
package device's memory limits on iOS.

This was the last blocker to removing our fork.

These values are now vars rather than consts for iOS.

c27ff9b9f6

Adjust them on startup to our preferred values.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-24 12:03:57 -07:00
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>
2021-05-16 14:52:00 -07:00
Brad Fitzpatrick
5b52b64094 tsnet: add Tailscale-as-a-library package
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-05-14 12:46:42 -07:00
Josh Bleecher Snyder
ebcd7ab890 wgengine: remove wireguard-go DeviceOptions
We no longer need them.
This also removes the 32 bytes of prefix junk before endpoints.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-11 15:30:39 -07:00
Josh Bleecher Snyder
aacb2107ae all: add extra information to serialized endpoints
magicsock.Conn.ParseEndpoint requires a peer's public key,
disco key, and legacy ip/ports in order to do its job.
We currently accomplish that by:

* adding the public key in our wireguard-go fork
* encoding the disco key as magic hostname
* using a bespoke comma-separated encoding

It's a bit messy.

Instead, switch to something simpler: use a json-encoded struct
containing exactly the information we need, in the form we use it.

Our wireguard-go fork still adds the public key to the
address when it passes it to ParseEndpoint, but now the code
compensating for that is just a couple of simple, well-commented lines.
Once this commit is in, we can remove that part of the fork
and remove the compensating code.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-05-11 15:13:42 -07:00
Josh Bleecher Snyder
98cae48e70 wgengine/wglog: optimize wireguardGoString
The new code is ugly, but much faster and leaner.

name        old time/op    new time/op    delta
SetPeers-8    7.81µs ± 1%    3.59µs ± 1%  -54.04%  (p=0.000 n=9+10)

name        old alloc/op   new alloc/op   delta
SetPeers-8    7.68kB ± 0%    2.53kB ± 0%  -67.08%  (p=0.000 n=10+10)

name        old allocs/op  new allocs/op  delta
SetPeers-8       237 ± 0%        99 ± 0%  -58.23%  (p=0.000 n=10+10)

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-11 14:28:47 -07:00
Josh Bleecher Snyder
9356912053 wgengine/wglog: add BenchmarkSetPeer
Because it showed up on hello profiles.

Cycle through some moderate-sized sets of peers.
This should cover the "small tweaks to netmap"
and the "up/down cycle" cases.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-11 14:28:47 -07:00
Brad Fitzpatrick
36a26e6a71 internal/deephash: rename from deepprint
Yes, it printed, but that was an implementation detail for hashing.

And coming optimization will make it print even less.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-05-11 12:11:16 -07:00
Josh Bleecher Snyder
773fcfd007 Revert "wgengine/bench: skip flaky test"
This reverts commit d707e2f7e5.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-11 11:28:30 -07:00
Josh Bleecher Snyder
68911f6778 wgengine/bench: ignore "engine closing" errors
On benchmark completion, we shut down the wgengine.
If we happen to poll for status during shutdown,
we get an "engine closing" error.
It doesn't hurt anything; ignore it.

Fixes tailscale/corp#1776

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-11 11:28:30 -07:00
Brad Fitzpatrick
d707e2f7e5 wgengine/bench: skip flaky test
Updates tailscale/corp#1776

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-05-11 11:10:21 -07:00
Josh Bleecher Snyder
8d2a90529e wgengine/bench: hold lock in TrafficGen.GotPacket while calling first packet callback
Without any synchronization here, the "first packet" callback can
be delayed indefinitely, while other work continues.
Since the callback starts the benchmark timer, this could skew results.
Worse, if the benchmark manages to complete before the benchmark timer begins,
it'll cause a data race with the benchmark shutdown performed by package testing.
That is what is reported in #1881.

This is a bit unfortunate, in that it means that users of TrafficGen have
to be careful to keep this callback speedy and lightweight and to avoid deadlocks.

Fixes #1881

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-10 09:45:35 -07:00
Josh Bleecher Snyder
a72fb7ac0b wgengine/bench: handle multiple Engine status callbacks
It is possible to get multiple status callbacks from an Engine.
We need to wait for at least one from each Engine.
Without limiting to one per Engine,
wait.Wait can exit early or can panic due to a negative counter.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-10 09:45:35 -07:00
Josh Bleecher Snyder
6618e82ba2 wgengine/bench: close Engines on benchmark completion
This reduces the speed with which these benchmarks exhaust their supply fds.
Not to zero unfortunately, but it's still helpful when doing long runs.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-10 09:45:35 -07:00
Josh Bleecher Snyder
ddd85b9d91 wgengine/magicsock: rename discoEndpoint.wgEndpointHostPort to wgEndpoint
Fields rename only.

Part of the general effort to make our code agnostic about endpoint formatting.
It's just a name, but it will soon be a misleading one; be more generic.
Do this as a separate commit because it generates a lot of whitespace changes.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-06 12:44:22 -07:00
Josh Bleecher Snyder
e0bd3cc70c wgengine/magicsock: use netaddr.MustParseIPPrefix
Delete our bespoke helper.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-06 12:44:22 -07:00
Josh Bleecher Snyder
bc68e22c5b all: s/CreateEndpoint/ParseEndpoint/ in docs
Upstream wireguard-go renamed the interface method
from CreateEndpoint to ParseEndpoint.
I missed some comments. Fix them.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-06 12:44:22 -07:00
Josh Bleecher Snyder
9bce1b7fc1 wgengine/wgcfg: make device test endpoint-format-agnostic
By using conn.NewDefaultBind, this test requires that our endpoints
be comprehensible to wireguard-go. Instead, use a no-op bind that
treats endpoints as opaque strings.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-06 12:44:22 -07:00
Josh Bleecher Snyder
73ad1f804b wgengine/wgcfg: use autogenerated Clone methods
Delete the manually written ones named Copy.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-06 12:44:22 -07:00
Josh Bleecher Snyder
a0dacba877 wgengine/magicsock: simplify legacy endpoint DstToString
Legacy endpoints (addrSet) currently reconstruct their dst string when requested.

Instead, store the dst string we were given to begin with.
In addition to being simpler and cheaper, this makes less code
aware of how to interpret endpoint strings.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-06 12:44:22 -07:00
Josh Bleecher Snyder
777c816b34 wgengine/wgcfg: return better errors from DeviceConfig, ReconfigDevice
Prefer the error from the actual wireguard-go device method call,
not {To,From}UAPI, as those tend to be less interesting I/O errors.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-06 12:44:22 -07:00
Josh Bleecher Snyder
1f6c4ba7c3 wgengine/wgcfg: prevent ReconfigDevice from hanging on error
When wireguard-go's UAPI interface fails with an error, ReconfigDevice hangs.
Fix that by buffering the channel and closing the writer after the call.
The code now matches the corresponding code in DeviceConfig, where I got it right.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-06 12:44:22 -07:00
Josh Bleecher Snyder
ed63a041bf wgengine/userspace: delete HandshakeDone
It is unused, and has been since early Feb 2021 (Tailscale 1.6).
We can't get delete the DeviceOptions entirely yet;
first #1831 and #1839 need to go in, along with some wireguard-go changes.
Deleting this chunk of code now will make the later commits more clearly correct.

Pingers can now go too.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-05-06 11:20:46 -07:00
Brad Fitzpatrick
b8fb8264a5 wgengine/netstack: avoid delivering incoming packets to both netstack + host
The earlier eb06ec172f fixed
the flaky SSH issue (tailscale/corp#1725) by making sure that packets
addressed to Tailscale IPs in hybrid netstack mode weren't delivered
to netstack, but another issue remained:

All traffic handled by netstack was also potentially being handled by
the host networking stack, as the filter hook returned "Accept", which
made it keep processing. This could lead to various random racey chaos
as a function of OS/firewalls/routes/etc.

Instead, once we inject into netstack, stop our caller's packet
processing.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-05-06 06:43:16 -07:00
Brad Fitzpatrick
1a1123d461 wgengine: fix pendopen debug to not track SYN+ACKs, show Node.Online state
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-05-05 15:25:11 -07:00
Brad Fitzpatrick
eb06ec172f wgengine/netstack: don't pass non-subnet traffic to netstack in hybrid mode
Fixes tailscale/corp#1725

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-05-05 13:38:55 -07:00
Brad Fitzpatrick
7629cd6120 net/tsaddr: add NewContainsIPFunc (move from wgengine)
I want to use this from netstack but it's not exported.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-05-05 13:15:50 -07:00
Josh Bleecher Snyder
47ebd1e9a2 wgengine/router: use net.IP.Equal instead of bytes.Equal to compare IPs
Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-05-04 08:54:50 -07:00
Josh Bleecher Snyder
f91c2dfaca wgengine/router: remove unused field
Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-05-04 08:54:50 -07:00
Josh Bleecher Snyder
9360f36ebd all: use lower-case letters at the start of error message
Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-05-04 08:54:50 -07:00
Josh Bleecher Snyder
64047815b0 wgenengine/magicsock: delete cursed tests
Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-05-03 11:09:44 -07:00
Josh Bleecher Snyder
59026a291d wgengine/wglog: improve wireguard-go logging rate limiting
Prior to wireguard-go using printf-style logging,
all wireguard-go logging occurred using format string "%s".
We fixed that but continued to use %s when we rewrote
peer identifiers into Tailscale style.

This commit removes that %sl, which makes rate limiting work correctly.
As a happy side-benefit, it should generate less garbage.

Instead of replacing all wireguard-go peer identifiers
that might occur anywhere in a fully formatted log string,
assume that they only come from args.
Check all args for things that look like *device.Peers
and replace them with appropriately reformatted strings.

There is a variety of ways that this could go wrong
(unusual format verbs or modifiers, peer identifiers
occurring as part of a larger printed object, future API changes),
but none of them occur now, are likely to be added,
or would be hard to work around if they did.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-04-30 09:45:10 -07:00
Josh Bleecher Snyder
1f94d43b50 wgengine/wglog: delay formatting
The "stop phrases" we use all occur in wireguard-go in the format string.
We can avoid doing a bunch of fmt.Sprintf work when they appear.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-04-30 09:45:10 -07:00
Josh Bleecher Snyder
20e04418ff net/dns: add GOOS build tags
Fixes #1786

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-04-29 21:34:55 -07:00
Josh Bleecher Snyder
7ee891f5fd all: delete wgcfg.Key and wgcfg.PrivateKey
For historical reasons, we ended up with two near-duplicate
copies of curve25519 key types, one in the wireguard-go module
(wgcfg) and one in the tailscale module (types/wgkey).
Then we moved wgcfg to the tailscale module.
We can now remove the wgcfg key type in favor of wgkey.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-04-29 14:14:34 -07:00
Josh Bleecher Snyder
9d542e08e2 wgengine/magicsock: always run ReceiveIPv6
One of the consequences of the 	bind refactoring in 6f23087175
is that attempting to bind an IPv6 socket will always
result in c.pconn6.pconn being non-nil.
If the bind fails, it'll be set to a placeholder packet conn
that blocks forever.

As a result, we can always run ReceiveIPv6 and health check it.
This removes IPv4/IPv6 asymmetry and also will allow health checks
to detect any IPv6 receive func failures.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-04-28 11:07:14 -07:00
Josh Bleecher Snyder
fe50ded95c health: track whether we have a functional udp4 bind
Suggested-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-04-28 11:07:14 -07:00
Josh Bleecher Snyder
7dc7078d96 wgengine/magicsock: use netaddr.IP in listenPacket
It must be an IP address; enforce that at the type level.

Suggested-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-04-28 11:07:14 -07:00
Josh Bleecher Snyder
3c543c103a 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>
2021-04-28 10:39:28 -07:00
Josh Bleecher Snyder
8fb66e20a4 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>
2021-04-28 10:39:28 -07:00
Josh Bleecher Snyder
a8f61969b9 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>
2021-04-28 10:39:28 -07:00
Brad Fitzpatrick
bb2141e0cf wgengine: periodically poll engine status for logging side effect
Fixes tailscale/corp#1560

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-04-27 13:55:47 -07:00
Brad Fitzpatrick
3c9dea85e6 wgengine: update a log line from 'weird' to conventional 'unexpected'
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-04-27 09:59:25 -07:00
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>
2021-04-26 17:35:49 -07:00
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>
2021-04-26 17:35:49 -07:00
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>
2021-04-26 17:16:51 -07:00
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>
2021-04-26 03:51:13 -04:00
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>
2021-04-26 03:51:13 -04:00
Maisem Ali
590792915a wgengine/router{win}: ignore broadcast routes added by Windows when removing routes.
Signed-off-by: Maisem Ali <maisem@tailscale.com>
2021-04-24 14:13:35 -07:00
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>
2021-04-23 08:42:04 -07:00
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>
2021-04-22 12:48:10 -07:00
Josh Bleecher Snyder
f845aae761 health: track whether magicsock receive functions are running
Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-04-22 08:57:36 -07:00
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>
2021-04-22 08:29:20 -07:00
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>
2021-04-21 12:29:28 -07:00
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>
2021-04-21 12:25:01 -07:00
Naman Sood
4a90a91d29
wgengine/netstack: log ForwarderRequest in readable form, only in debug mode (#1758)
* wgengine/netstack: log ForwarderRequest in readable form, only in debug mode

Fixes #1757

Signed-off-by: Naman Sood <mail@nsood.in>
2021-04-21 14:50:48 -04:00
Josh Bleecher Snyder
07c95a0219 wgengine/wgcfg/nmcfg: consolidate exit node log lines
These were getting rate-limited for nodes with many peers.
Consolate the output into single lines, which are nicer anyway.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-04-21 11:29:30 -07:00
Josh Bleecher Snyder
48e30bb8de wgengine/magicsock: remove named return
Doesn't add anything.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-04-20 10:12:07 -07:00
Josh Bleecher Snyder
a2a2c0ce1c wgengine/magicsock: fix two comments
Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-04-20 10:12:07 -07:00
Josh Bleecher Snyder
b1e624ef04 wgengine/magicsock: remove unnecessary type assertions
Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-04-20 10:12:07 -07:00
Josh Bleecher Snyder
98714e784b wgengine/magicsock: improve Rebind logging
We were accidentally logging oldPort -> oldPort.

Log oldPort as well as c.port; if we failed to get the preferred port
in a previous rebind, oldPort might differ from c.port.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-04-20 10:12:07 -07:00
Josh Bleecher Snyder
15ceacc4c5 wgengine/magicsock: accept a host and port instead of an addr in listenPacket
This simplifies call sites and prevents accidental failure to use net.JoinHostPort.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
2021-04-20 10:12:07 -07:00
Brad Fitzpatrick
b993d9802a ipn/ipnlocal, etc: require file sharing capability to send/recv files
tailscale/corp#1582

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-04-16 10:58:19 -07:00
Maisem Ali
4f3203556d wgengine/router: add the Tailscale ULA route on darwin.
Signed-off-by: Maisem Ali <maisem@tailscale.com>
2021-04-15 17:07:50 -07:00
Brad Fitzpatrick
762180595d ipn/ipnstate: add PeerStatus.TailscaleIPs slice, deprecate TailAddr
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-04-14 08:12:31 -07:00
Brad Fitzpatrick
34d2f5a3d9 tailcfg: add Endpoint, EndpointType, MapRequest.EndpointType
Track endpoints internally with a new tailcfg.Endpoint type that
includes a typed netaddr.IPPort (instead of just a string) and
includes a type for how that endpoint was discovered (STUN, local,
etc).

Use []tailcfg.Endpoint instead of []string internally.

At the last second, send it to the control server as the existing
[]string for endpoints, but also include a new parallel
MapRequest.EndpointType []tailcfg.EndpointType, so the control server
can start filtering out less-important endpoint changes from
new-enough clients. Notably, STUN-discovered endpoints can be filtered
out from 1.6+ clients, as they can discover them amongst each other
via CallMeMaybe disco exchanges started over DERP. And STUN endpoints
change a lot, causing a lot of MapResposne updates. But portmapped
endpoints are worth keeping for now, as they they work right away
without requiring the firewall traversal extra RTT dance.

End result will be less control->client bandwidth. (despite negligible
increase in client->control bandwidth)

Updates tailscale/corp#1543

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-04-13 10:12:14 -07:00
Maisem Ali
1b9d8771dc ipn/ipnlocal,wgengine/router,cmd/tailscale: add flag to allow local lan access when routing traffic via an exit node.
For #1527

Signed-off-by: Maisem Ali <maisem@tailscale.com>
2021-04-12 17:29:01 -07:00
David Anderson
854d5d36a1 net/dns: return error from NewOSManager, use it to initialize NM.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-04-12 15:51:37 -07:00
Brad Fitzpatrick
d5d70ae9ea wgengine/monitor: reduce Linux log spam on down
Fixes #1689

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-04-12 10:38:51 -07:00
David Anderson
84430cdfa1 net/dns: improve NetworkManager detection, using more DBus.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-04-11 15:22:06 -07:00
David Anderson
19eca34f47 wgengine/router: fix FreeBSD configuration failure on the v6 /48.
On FreeBSD, we add the interface IP as a /48 to work around a kernel
bug, so we mustn't then try to add a /48 route to the Tailscale ULA,
since that will fail as a dupe.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-04-10 19:36:26 -07:00
David Anderson
4a64d2a603 net/dns: some post-review cleanups.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-04-07 15:40:31 -07:00
David Anderson
68f76e9aa1 net/dns: add GetBaseConfig to OSConfigurator interface.
Part of #953, required to make split DNS work on more basic
platforms.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-04-07 15:40:31 -07:00
Brad Fitzpatrick
d488678fdc cmd/tailscaled, wgengine{,/netstack}: add netstack hybrid mode, add to Windows
For #707

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-04-06 21:37:28 -07:00
Denton Gentry
3089081349 monitor/polling: reduce Cloud Run polling interval.
Cloud Run's routes never change at runtime. Don't poll it for
route changes very often.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
2021-04-06 17:21:16 -07:00
David Anderson
de6dc4c510 net/dns: add a Primary field to OSConfig.
Currently ignored.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-04-05 13:05:47 -07:00
David Anderson
7d84ee6c98 net/dns: unify the OS manager and internal resolver.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-04-05 10:55:35 -07:00
David Anderson
1bf91c8123 net/dns/resolver: remove unused err return value.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-04-05 10:55:35 -07:00
David Anderson
f007a9dd6b health: add DNS subsystem and plumb errors in.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-04-05 10:55:35 -07:00
David Anderson
4c61ebacf4 wgengine: move DNS configuration out of wgengine/router.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-04-05 10:55:35 -07:00
Josh Bleecher Snyder
ba72126b72 wgengine/magicsock: remove RebindingUDPConn.FakeClosed
It existed to work around the frequent opening and closing
of the conn.Bind done by wireguard-go.
The preceding commit removed that behavior,
so we can simply close the connections
when we are done with them.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-04-03 10:32:51 -07:00
Josh Bleecher Snyder
69cdc30c6d wgengine/wgcfg: remove Config.ListenPort
We don't use the port that wireguard-go passes to us (via magicsock.connBind.Open).
We ignore it entirely and use the port we selected.

When we tell wireguard-go that we're changing the listen_port,
it calls connBind.Close and then connBind.Open.
And in the meantime, it stops calling the receive functions,
which means that we stop receiving and processing UDP and DERP packets.
And that is Very Bad.

That was never a problem prior to b3ceca1dd7,
because we passed the SkipBindUpdate flag to our wireguard-go fork,
which told wireguard-go not to re-bind on listen_port changes.
That commit eliminated the SkipBindUpdate flag.

We could write a bunch of code to work around the gap.
We could add background readers that process UDP and DERP packets when wireguard-go isn't.
But it's simpler to never create the conditions in which wireguard-go rebinds.

The other scenario in which wireguard-go re-binds is device.Down.
Conveniently, we never call device.Down. We go from device.Up to device.Close,
and the latter only when we're shutting down a magicsock.Conn completely.

Rubber-ducked-by: Avery Pennarun <apenwarr@tailscale.com>
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-04-03 10:32:51 -07:00
David Anderson
27a1a2976a wgengine/router: add a CallbackRouter shim.
The shim implements both network and DNS configurators,
and feeds both into a single callback that receives
both configs.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-04-02 18:43:24 -07:00
Josh Bleecher Snyder
b3ceca1dd7 wgengine/...: split into multiple receive functions
Upstream wireguard-go has changed its receive model.
NewDevice now accepts a conn.Bind interface.

The conn.Bind is stateless; magicsock.Conns are stateful.
To work around this, we add a connBind type that supports
cheap teardown and bring-up, backed by a Conn.

The new conn.Bind allows us to specify a set of receive functions,
rather than having to shoehorn everything into ReceiveIPv4 and ReceiveIPv6.
This lets us plumbing DERP messages directly into wireguard-go,
instead of having to mux them via ReceiveIPv4.

One consequence of the new conn.Bind layer is that
closing the wireguard-go device is now indistinguishable
from the routine bring-up and tear-down normally experienced
by a conn.Bind. We thus have to explicitly close the magicsock.Conn
when the close the wireguard-go device.

One downside of this change is that we are reliant on wireguard-go
to call receiveDERP to process DERP messages. This is fine for now,
but is perhaps something we should fix in the future.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-04-02 12:18:54 -07:00
David Anderson
6ad44f9fdf wgengine: take in dns.Config, split out to resolver.Config and dns.OSConfig.
Stepping stone towards having the DNS package handle the config splitting.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-04-02 00:59:44 -07:00
David Anderson
8af9d770cf net/dns: rename Config to OSConfig.
Making way for a new higher level config struct.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-04-02 00:59:44 -07:00
David Anderson
fcfc0d3a08 net/dns: remove ManagerConfig, pass relevant args directly.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-04-01 23:26:52 -07:00
David Anderson
f77ba75d6c wgengine/router: move DNS cleanup into the DNS package.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-04-01 22:35:34 -07:00
David Anderson
15875ccc63 wgengine/router: don't store unused tunname on windows. 2021-04-01 22:28:24 -07:00
Josh Bleecher Snyder
34d4943357 all: gofmt -s
The code is not obviously better or worse, but this makes the little warning
triangle in my editor go away, and the distraction removal is worth it.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-04-01 11:06:14 -07:00
Josh Bleecher Snyder
1df162b05b wgengine/magicsock: adapt CreateEndpoint signature to match wireguard-go
Part of a temporary change to make merging wireguard-go easier.
See https://github.com/tailscale/wireguard-go/pull/45.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-04-01 09:55:45 -07:00
Brad Fitzpatrick
e64383a80e wgengine/router: document some fields a bit more
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-04-01 07:50:50 -07:00
Denton Gentry
35ab4020c7 wgengine/monitor: Linux fall back to polling
Google Cloud Run does not implement NETLINK_ROUTE RTMGRP.
If initialization of the netlink socket or group membership
fails, fall back to a polling implementation.

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
2021-04-01 07:29:11 -07:00
David Anderson
90f82b6946 net/dns/resolver: add live reconfig, plumb through to ipnlocal.
The resolver still only supports a single upstream config, and
ipn/wgengine still have to split up the DNS config, but this moves
closer to unifying the DNS configs.

As a handy side-effect of the refactor, IPv6 MagicDNS records exist
now.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-04-01 01:44:03 -07:00
David Anderson
f185d62dc8 net/dns/resolver: unexport Packet, only use it internally.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-31 23:12:31 -07:00
David Anderson
5fb9e00ecf net/dns/resolver: remove Start method, fully spin up in New instead.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-31 23:12:31 -07:00
David Anderson
075fb93e69 net/dns/resolver: remove the Config struct.
In preparation for reintroducing a runtime reconfig Config struct.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-31 23:12:31 -07:00
David Anderson
bc81dd4690 net/dns/resolver: rename ResolverConfig to just Config.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-31 23:12:31 -07:00
David Anderson
d99f5b1596 net/dns/resolver: factor the resolver out into a sub-package.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-31 23:12:30 -07:00
Naman Sood
31c7745631
wgengine/netstack: stop re-adding IPs registered by active TCP connections (#1629)
Signed-off-by: Naman Sood <mail@nsood.in>
2021-03-31 15:32:33 -04:00
Brad Fitzpatrick
7f03c0f8fe wgengine/wgcfg/nmcfg: reduce some logging when a /0 route skipped
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-31 09:51:55 -07:00
Josh Bleecher Snyder
7b907615d5 wgengine/wgcfg/nmcfg: remove dead code
The call to appendEndpoint updates cpeer.Endpoints.
Then it is overwritten in the next line.
The only errors from appendEndpoint occur when
the host/port pair is malformed, but that cannot happen.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-03-31 09:09:19 -07:00
Josh Bleecher Snyder
36a85e1760 wgengine/magicsock: don't call t.Fatal in magicStack.IP
It can end up executing an a new goroutine,
at which point instead of immediately stopping test execution, it hangs.
Since this is unexpected anyway, panic instead.
As a bonus, it makes call sites nicer and removes a kludge comment.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-03-30 11:48:13 -07:00
Brad Fitzpatrick
4c83bbf850 wgengine: add IsNetstack func and test
So we have a documented & tested way to check whether we're in
netstack mode. To be used by future commits.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-30 09:53:12 -07:00
Brad Fitzpatrick
91bc723817 wgengine: add temp workaround for netstack WhoIs registration race
Updates #1616

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-30 09:50:54 -07:00
Brad Fitzpatrick
41e4e02e57 net/{packet,tstun}: send peerapi port in TSMP pongs
For discovery when an explicit hostname/IP is known. We'll still
also send it via control for finding peers by a list.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-29 15:18:23 -07:00
Naman Sood
662fbd4a09
wgengine/netstack: Allow userspace networking mode to expose subnets (#1588)
wgengine/netstack: Allow userspace networking mode to expose subnets

Updates #504

Updates #707

Signed-off-by: Naman Sood <mail@nsood.in>
2021-03-29 14:33:05 -04:00
Brad Fitzpatrick
a4c679e646 wgengine/monitor: on wall time jump, synthesize network change event
... to force rebinds of TCP connections

Fixes #1555
Updates tailscale/felicity#4

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-28 21:56:50 -07:00
David Anderson
07bf4eb685 wgengine: rename Fake to RespondToPing.
"Fake" doesn't mean a lot any more, given that many components
of the engine can be faked out, including in valid production
configurations like userspace-networking.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-28 21:45:02 -07:00
David Anderson
0fb738760f wgengine: make Tun optional again, default to fake.
This makes setup more explicit in prod codepaths, without
requiring a bunch of arguments or helpers for tests and
userspace mode.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-28 21:45:02 -07:00
Brad Fitzpatrick
e18c3a7d84 wgengine: optimize isLocalAddr a bit
On macOS/iOS, this removes a map lookup per outgoing packet.

Noticed it while reading code, not from profiles, but can't hurt.

BenchmarkGenLocalAddrFunc
BenchmarkGenLocalAddrFunc/map1
BenchmarkGenLocalAddrFunc/map1-4                16184868                69.78 ns/op
BenchmarkGenLocalAddrFunc/map2
BenchmarkGenLocalAddrFunc/map2-4                16878140                70.73 ns/op
BenchmarkGenLocalAddrFunc/or1
BenchmarkGenLocalAddrFunc/or1-4                 623055721                1.950 ns/op
BenchmarkGenLocalAddrFunc/or2
BenchmarkGenLocalAddrFunc/or2-4                 472493098                2.589 ns/op

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-28 21:23:25 -07:00
David Anderson
93a4aa697c wgengine: default Router to a no-op router.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-28 18:59:48 -07:00
David Anderson
440effb21a wgengine: remove Config.TUN argument. 2021-03-28 18:45:17 -07:00
Josh Bleecher Snyder
4954fbfda6 wgengine: extend TestWatchdog timeout on macOS
This works around the close syscall being slow.
We can revert this if we find a fix or if Apple makes close fast again.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-03-27 09:27:11 -07:00
David Anderson
2df8adef9d wgengine: make the tun.Device required at construction.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-27 00:33:09 -07:00
David Anderson
016de16b2e net/tstun: rename TUN to Wrapper.
The tstun packagen contains both constructors for generic tun
Devices, and a wrapper that provides additional functionality.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-26 23:15:22 -07:00
David Anderson
82ab7972f4 net/tstun: rename NewFakeTUN to NewFake.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-26 22:46:47 -07:00
David Anderson
588b70f468 net/tstun: merge in wgengine/tstun.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-26 22:31:54 -07:00
David Anderson
2b4bfeda1a wgengine: pass in an explicit router.Router, rather than a generator.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-26 22:01:55 -07:00
David Anderson
44d9929208 wgengine: remove Config.TUNName, require caller to create device.
Also factors out device creation and associated OS workarounds to
net/tun.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-26 21:08:11 -07:00
David Anderson
0a84aaca0a wgengine/router: remove unused wireguard *Device argument.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-26 19:43:13 -07:00
Brad Fitzpatrick
bcf571ec97 wgengine/monitor: fix OpenBSD build
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-26 09:16:43 -07:00
Brad Fitzpatrick
7f174e84e6 net/interfaces: remove mutating methods, add EqualFiltered instead
Now callers (wgengine/monitor) don't need to mutate the state to remove
boring interfaces before calling State.Equal. Instead, the methods
to remove boring interfaces from the State are removed, as is
the reflect-using Equal method itself, and in their place is
a new EqualFiltered method that takes a func predicate to match
interfaces to compare.

And then the FilterInteresting predicate is added for use
with EqualFiltered to do the job that that wgengine/monitor
previously wanted.

Now wgengine/monitor can keep the full interface state around,
including the "boring" interfaces, which we'll need for peerapi on
macOS/iOS to bind to the interface index of the utunN device.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-26 09:11:48 -07:00
David Anderson
672731ac6f many: gofmt.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-25 17:41:51 -07:00
David Anderson
6521f02ff6 Move DNS flush logic to net/dns.
Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-25 17:40:52 -07:00
David Anderson
9f7f2af008 wgengine/router/dns: move to net/dns.
Preparation for merging the APIs and whatnot.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-25 16:25:30 -07:00
David Anderson
8432999835 Move wgengine/tsdns to net/dns.
Straight move+fixup, no other changes. In prep for merging with
wgengine/router/dns.

Signed-off-by: David Anderson <danderson@tailscale.com>
2021-03-25 16:25:30 -07:00
Brad Fitzpatrick
81143b6d9a ipn/ipnlocal: start of peerapi between nodes
Also some necessary refactoring of the ipn/ipnstate too.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-25 16:00:35 -07:00
Josh Bleecher Snyder
28af46fb3b wgengine: pass logger as a separate arg to device.NewDevice
Adapt to minor API changes in wireguard-go.
And factor out device.DeviceOptions variables.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-03-24 10:39:58 -07:00
Brad Fitzpatrick
2384c112c9 net/packet, wgengine/{filter,tstun}: add TSMP ping
Fixes #1467

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-24 09:50:01 -07:00
Josh Bleecher Snyder
4b77eca2de wgengine/magicsock: check returned error in addTestEndpoint
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2021-03-24 09:46:36 -07:00
Brad Fitzpatrick
c99f260e40 wgengine/magicsock: prefer IPv6 transport if roughly equivalent latency
Fixes #1566

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-23 17:34:01 -07:00
Brad Fitzpatrick
e2b3d9aa5f all: s/Magic DNS/MagicDNS/ for consistency
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-23 14:25:28 -07:00
Brad Fitzpatrick
9643d8b34d wgengine/magicsock: add an addrLatency type to combine an IPPort+time.Duration
Updates #1566 (but no behavior changes as of this change)

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-23 10:09:10 -07:00
Brad Fitzpatrick
96dfeb2d7f wgengine: log tailscale pings
Fixes #1561

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-22 21:48:05 -07:00
Brad Fitzpatrick
85138d3183 health: track whether any network interface is up
Fixes #1562

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-22 21:42:14 -07:00
Brad Fitzpatrick
0994a9f7c4 wgengine{,/magicsock}: fix, improve "tailscale ping" to default routes and subnets
e.g.

$ tailscale ping 1.1.1.1
exit node found but not enabled

$ tailscale ping 10.2.200.2
node "tsbfvlan2" found, but not using its 10.2.200.0/24 route

$ sudo tailscale  up --accept-routes
$ tailscale ping 10.2.200.2
pong from tsbfvlan2 (100.124.196.94) via 10.2.200.34:41641 in 1ms

$ tailscale ping mon.ts.tailscale.com
pong from monitoring (100.88.178.64) via DERP(sfo) in 83ms
pong from monitoring (100.88.178.64) via DERP(sfo) in 21ms
pong from monitoring (100.88.178.64) via [2604:a880:4:d1::37:d001]:41641 in 22ms

This necessarily moves code up from magicsock to wgengine, so we can
look at the actual wireguard config.

Fixes #1564

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-22 21:29:44 -07:00
Brad Fitzpatrick
7e0d12e7cc wgengine/magicsock: don't update control if only endpoint order changes
Updates #1559

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-22 10:37:04 -07:00
Brad Fitzpatrick
1eb95c7e32 net/packet, wgengine{,/filter}: remove net/packet IPProto forwarding consts
Only use the ones in types/ipproto now.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-20 21:45:47 -07:00
Brad Fitzpatrick
01b90df2fa net/packet, wgengine/filter: support SCTP
Add proto to flowtrack.Tuple.

Add types/ipproto leaf package to break a cycle.

Server-side ACL work remains.

Updates #1516

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-20 21:34:13 -07:00
Brad Fitzpatrick
90a6fb7ffe tailcfg: add FilterRule.IPProto
Updates #1516

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-19 18:08:23 -07:00
Brad Fitzpatrick
32562a82a9 wgengine/magicsock: annotate a few more disco logs as verbose
Fixes #1540

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-19 13:24:29 -07:00
Brad Fitzpatrick
c19ed37b0f wgengine/magicsock: mark some legacy debug log output as verbose
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-18 08:17:59 -07:00
Brad Fitzpatrick
aa79a57f63 wgengine/netstack: use inet.af/netstack, remove 64-bit only limitation
This reverts the revert commit 84aba349d9.

And changes us to use inet.af/netstack.

Updates #1518

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-17 22:46:09 -07:00
David Anderson
84aba349d9 Revert "wgengine/netstack: update gvisor to remove 64-bit only limitation"
Breaks our corp repo due to gRPC dependency hell.

This reverts commit d42f8b7f9a.
2021-03-16 15:36:06 -07:00
Brad Fitzpatrick
e0f2796b43 wgengine: don't diagnose iOS NWPathMonitor connection probe timeouts
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-16 14:13:02 -07:00
Brad Fitzpatrick
0f90586da8 wgengine/monitor: skip more route messages on darwin
Should help iOS battery life on NEProvider.wake/skip events
with useless route updates that shouldn't cause re-STUNs.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-16 12:59:26 -07:00
Brad Fitzpatrick
d42f8b7f9a wgengine/netstack: update gvisor to remove 64-bit only limitation
gVisor fixed their google/gvisor#1446 so we can include gVisor mode
on 32-bit machines.

A few minor upstream API changes, as normal.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-15 21:02:51 -07:00
Brad Fitzpatrick
232cfda280 wgengine/router: report to control when setPrivateNetwork fails
Fixes #1503

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-15 16:19:40 -07:00
Brad Fitzpatrick
ba8c6d0775 health, controlclient, ipn, magicsock: tell health package state of things
Not yet checking anything. Just plumbing states into the health package.

Updates #1505

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-15 15:20:55 -07:00
Naman Sood
770aa71ffb client, cmd/hello, ipn, wgengine: fix whois for netstack-forwarded connections
Updates #504

Updates #707

Signed-off-by: Naman Sood <mail@nsood.in>
2021-03-15 18:14:09 -04:00
Brad Fitzpatrick
44ab0acbdb net/portmapper, wgengine/monitor: cache gateway IP info until link changes
Cuts down allocs & CPU in steady state (on regular STUN probes) when network
is unchanging.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-15 14:27:39 -07:00
Brad Fitzpatrick
d580b3f09e wgengine/router: fix go vet failure on BSDs
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-15 14:27:39 -07:00
Aleksandar Pesic
25d2dd868b wgengine/router: flushdns in windows when router config changes
Fixes: https://github.com/tailscale/tailscale/issues/1430

Signed-off-by: Aleksandar Pesic <peske.nis@gmail.com>
2021-03-15 13:03:01 +01:00
Brad Fitzpatrick
c81814e4f8 derp{,/derphttp},magicsock: tell DERP server when ping acks can be expected
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-12 09:55:02 -08:00
Brad Fitzpatrick
f9f3b67f3a wgengine{,tsdns}: rebind MagicDNS forwarders on link change
Fixes #1480

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2021-03-12 08:56:53 -08:00