Commit Graph

219 Commits (b42c4e2da19f5f0626628371b23527ae4a07708a)

Author SHA1 Message Date
Brad Fitzpatrick 70d71ba1e7 cmd/derpprobe: check derper TLS certs too
Change-Id: If8c48e012b294570ebbb1a46bacdc58fafbfbcc5
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 41fd4eab5c envknob: add new package for all the strconv.ParseBool(os.Getenv(..))
A new package can also later record/report which knobs are checked and
set. It also makes the code cleaner & easier to grep for env knobs.

Change-Id: Id8a123ab7539f1fadbd27e0cbeac79c2e4f09751
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 2aeb93003f derp: add metrics to server got pings, sent pongs
Updates #3652

Change-Id: I1d350bcaee39ea36b0c71912028624d18fb541b4
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 2c94e3c4ad wgengine/magicsock: don't unconditionally close DERP connections on rebind
Only if the source address isn't on the currently active interface or
a ping of the DERP server fails.

Updates #3619

Change-Id: I6bf06503cff4d781f518b437c8744ac29577acc8
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 63d9c7b9b3 derp: add Client.LocalAddr method
So magicsock can later ask a DERP connection whether its source IP
would've changed if it reconnected.

Updates #3619

Change-Id: Ibc8810340c511d6786b60c78c1a61c09f5800e40
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 535b925d1b derp/derphttp: add Client.Ping, SendPing methods
Continuing work in 434af15a04, to make it possible for magicsock to
probe whether a DERP server is still there.

Updates #3619

Change-Id: I366a77c27e93b876734e64f445b85ef01eb590f2
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 434af15a04 derp: support client->server ping (and server->client pong)
In prep for a future change to have client ping derp connections
when their state is questionable, rather than aggressively tearing
them down and doing a heavy reconnect when their state is unknown.

We already support ping/pong in the other direction (servers probing
clients) so we already had the two frame types, but I'd never finished
this direction.

Updates #3619

Change-Id: I024b815d9db1bc57c20f82f80f95fb55fc9e2fcc
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Josh Bleecher Snyder 758c37b83d net/netns: thread logf into control functions
So that darwin can log there without panicking during tests.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
3 years ago
David Anderson 84c3a09a8d types/key: export constants for key size, not a method.
Signed-off-by: David Anderson <danderson@tailscale.com>
3 years ago
David Anderson c1d009b9e9 ipn/ipnstate: use key.NodePublic instead of the generic key.Public.
Updates #3206.

Signed-off-by: David Anderson <danderson@tailscale.com>
3 years ago
David Anderson 1f06f77dcb derp: remove package shadowing of types/key.
Updates #3206

Signed-off-by: David Anderson <danderson@tailscale.com>
3 years ago
David Anderson 37c150aee1 derp: use new node key type.
Update #3206

Signed-off-by: David Anderson <danderson@tailscale.com>
3 years ago
Brad Fitzpatrick eebe7afad7 derp/derphttp: only log about a weird upgrade if any was specified
Otherwise random browser requests to /derp cause log spam.

Change-Id: I7bdf991d2106f0323868e651156c788a877a90d5
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 505f844a43 cmd/derper, derp/derphttp: add websocket support
Updates #3157

Change-Id: I337a919a3b350bc7bd9af567b49c4d5d6616abdd
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 7cf8ec8108 net/tlsdial: bake in LetsEncrypt's ISRG Root X1 root
We still try the host's x509 roots first, but if that fails (like if
the host is old), we fall back to using LetsEncrypt's root and
retrying with that.

tlsdial was used in the three main places: logs, control, DERP. But it
was missing in dnsfallback. So added it there too, so we can run fine
now on a machine with no DNS config and no root CAs configured.

Also, move SSLKEYLOGFILE support out of DERP. tlsdial is the logical place
for that support.

Fixes #1609

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 73f177e4d5 derp: throttle client sends if server advertises rate limits
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Josh Bleecher Snyder 3759fb8987 derp: deflake TestSendFreeze
On about 1 out of 500 runs, TestSendFreeze failed:

    derp_test.go:416: bob: unexpected message type derp.PeerGoneMessage

Closing alice before bob created a race.
If bob closed promptly, the test passed.
If bob closed slowly, and alice's disappearance caused
bob to receive a PeerGoneMessage before closing, the test failed.

Deflake the test by closing bob first.
With this fix, the test passed 12,000 times locally.

Fixes #2668

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
3 years ago
Brad Fitzpatrick fc160f80ee metrics: move currentFDs code to the metrics package
Updates #2784

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick a59b389a6a derp: add new health update and server restarting frame types
Updates #2756
Updates #2746

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 73280595a8 derp: accept dup clients without closing prior's connection
A public key should only have max one connection to a given
DERP node (or really: one connection to a node in a region).

But if people clone their machine keys (e.g. clone their VM, Raspbery
Pi SD card, etc), then we can get into a situation where a public key
is connected multiple times.

Originally, the DERP server handled this by just kicking out a prior
connections whenever a new one came. But this led to reconnect fights
where 2+ nodes were in hard loops trying to reconnect and kicking out
their peer.

Then a909d37a59 tried to add rate
limiting to how often that dup-kicking can happen, but empirically it
just doesn't work and ~leaks a bunch of goroutines and TCP
connections, tying them up for hour+ while more and more accumulate
and waste memory. Mostly because we were doing a time.Sleep forever
while not reading from their TCP connections.

Instead, just accept multiple connections per public key but track
which is the most recent. And if two both are writing back & forth,
then optionally disable them both. That last part is only enabled in
tests for now. The current default policy is just last-sender-wins
while we gather the next round of stats.

Updates #2751

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick ffd22050c0 derp: export current file descriptor metric 3 years ago
slowy07 ac0353e982 fix: typo spelling grammar
Signed-off-by: slowy07 <slowy.arfy@gmail.com>
3 years ago
Brad Fitzpatrick f35b8c3ead derp: fix meshing accounting edge case bug
If a peer is connected to multiple nodes in a region (so
multiForwarder is in use) and then a node restarts and re-sends all
its additions, this bug about whether an element is in the
multiForwarder could cause a one-time flip in the which peer node we
forward to.  Note a huge deal, but not written as intended.

Thanks to @lewgun for the bug report in #2141.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick fd7b738e5b derp: use pad32 package for padding, reduce duplication
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 7298e777d4 derp: reduce server memory by 30% by removing persistent bufio.Writer
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick b622c60ed0 derp,wgengine/magicsock: don't assume stringer is in $PATH for go:generate
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick e422e9f4c9 cmd/derper: mesh over VPC network
Updates #2414

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick e299300b48 net/dnscache: cache all IPs per hostname
Not yet used in the dialer, but plumbed around.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick a909d37a59 derp: rate limit how often same-key clients can kick each other off server
Updates #392
Updates #506

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
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>
3 years ago
Josh Bleecher Snyder 0ec9040c5e scripts: remove special case for _strings.go files in check license headers
And add a license header for derp/dropreason_string.go to make it happy.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
3 years ago
maddie d976a84d7e derp: allow self node when verifying clients
Fixes #2408

Signed-off-by: Maddie Zhan <maddie.zhan@cynovan.com>
3 years ago
Brad Fitzpatrick 05da2691a5 cmd/derper/derpprobe: add derp prober
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
Brad Fitzpatrick 4c0494185b derp: remove "fine for now" intentional slow memory leak from derp server
It was once believed that it might be useful. It wasn't. We never used it.

Remove it so we don't slowly leak memory.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
3 years ago
David Anderson d98829583a derp: use a dedicated queue for disco traffic.
Signed-off-by: David Anderson <danderson@tailscale.com>
3 years ago
David Anderson 67158549ab derp: actually export the new drop counter.
Signed-off-by: David Anderson <danderson@tailscale.com>
3 years ago
David Anderson 36492ace9d derp: add counters to track the type of dropped packets.
Signed-off-by: David Anderson <danderson@tailscale.com>
3 years ago
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>
3 years ago
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>
3 years ago
julianknodt 148602a89a derp,cmd/derper: allow server to verify clients
This adds a flag to the DERP server which specifies to verify clients through a local
tailscaled. It is opt-in, so should not affect existing clients, and is mainly intended for
users who want to run their own DERP servers. It assumes there is a local tailscaled running and
will attempt to hit it for peer status information.

Updates #1264

Signed-off-by: julianknodt <julianknodt@gmail.com>
3 years ago
julianknodt 3687e5352b derp: fix traffic handler peer addresses
Before it was using the local address and port, so fix that.
The fields in the response from `ss` are:

State, Recv-Q, Send-Q, Local Address:Port, Peer Address:Port, Process

Signed-off-by: julianknodt <julianknodt@gmail.com>
3 years ago
julianknodt 3728634af9 derp: add debug traffic handler
This adds a handler on the DERP server for logging bytes send and received by clients of the
server, by holding open a connection and recording if there is a difference between the number
of bytes sent and received. It sends a JSON marshalled object if there is an increase in the
number of bytes.

Signed-off-by: julianknodt <julianknodt@gmail.com>
3 years ago
julianknodt fe54721e31 derp: add pkt queue latency timer
It would be useful to know the time that packets spend inside of a queue before they are sent
off, as that can be indicative of the load the server is handling (and there was also an
existing TODO). This adds a simple exponential moving average metric to track the average packet
queue duration.
Changes during review:
Add CAS loop for recording queue timing w/ expvar.Func, rm snake_case, annotate in milliseconds,
convert

Signed-off-by: julianknodt <julianknodt@gmail.com>
4 years ago
Brad Fitzpatrick 3d4d97601a derp/derpmap: add São Paulo (derp11)
Updates #1499
4 years ago
Maisem Ali 4d142ebe06 derp: handle net.ErrClosed in TestSendFreeze
Signed-off-by: Maisem Ali <maisem@tailscale.com>
4 years ago
Brad Fitzpatrick ab2a8a7493 derp: return keep-alive message up to callers
To be used by health checking, which wants to see activity, even if idle.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
Brad Fitzpatrick c81814e4f8 derp{,/derphttp},magicsock: tell DERP server when ping acks can be expected
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
Brad Fitzpatrick 79d8288f0a wgengine/magicsock, derp, derp/derphttp: respond to DERP server->client pings
No server support yet, but we want Tailscale 1.6 clients to be able to respond
to them when the server can do it.

Updates #1310

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
Brad Fitzpatrick ca51529b81 derp/derphttp: return nicer errors from Recv on Close 4 years ago
Brad Fitzpatrick 741d654aa3 derp/derphttp: add a context and infoLogger option to RunWatchConnectionLoop 4 years ago
Brad Fitzpatrick 66be052a70 net/dnscache: work on IPv6-only hosts (again)
This fixes the regression where we had stopped working on IPv6-only
hosts.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
David Anderson 54e6c3a290 version: use OSS repo's version when building.
When building with redo, also include the git commit hash
from the proprietary repo, so that we have a precise commit
that identifies all build info (including Go toolchain version).

Add a top-level build script demonstrating to downstream distros
how to burn the right information into builds.

Adjust `tailscale version` to print commit hashes when available.

Fixes #841.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
Brad Fitzpatrick 1e0be5a458 tshttp, derphttp: send Proxy-Authorization, not Authorization, to proxies
Whoops. But weirdly, sending Authorization sometimes worked?
4 years ago
Brad Fitzpatrick 28f9cd06f5 tshttpproxy, controlclient, derphttp, logpolicy: send Negotiate auth to proxies
For Windows only, and only when built with Tailscale's Go tree.

Updates tailscale/corp#583
4 years ago
Brad Fitzpatrick 169ff22a84 derp: set NotBefore and NotAfter in DERP server's metacert
Fixes regression from e415991256 that
only affected Windows users because Go only on Windows delegates x509
cert validation to the OS and Windows as unhappy with our "metacert"
lacking NotBefore and NotAfter.

Fixes #705
4 years ago
Brad Fitzpatrick e415991256 derp, derp/derphttp: remove one RTT from DERP setup
* advertise server's DERP public key following its ServerHello
* have client look for that DEPR public key in the response
  PeerCertificates
* let client advertise it's going into a "fast start" mode
  if it finds it
* modify server to support that fast start mode, just not
  sending the HTTP response header

Cuts down another round trip, bringing the latency of being able to
write our first DERP frame from SF to Bangalore from ~725ms
(3 RTT) to ~481ms (2 RTT: TCP and TLS).

Fixes #693

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
Brad Fitzpatrick 9cb2df4ddd derp/derpmap: add London, Dallas, Seattle 4 years ago
Brad Fitzpatrick 805850add9 derp: remove JSON struct tags in comments
They don't work in comments.

Added a test too to show that there's no change in behavior.
(It does case insensitive matching on parse anyway)
4 years ago
Brad Fitzpatrick 287522730d derp/derphttp: support standard-ish SSLKEYLOGFILE environment variable
For debugging.
4 years ago
Brad Fitzpatrick c5eb57f4d6 net/tshttpproxy: new package, support WPAD/PAC proxies on Windows
Updates tailscale/corp#553

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
4 years ago
Brad Fitzpatrick 93ffc565e5 derp: remove protocol version 1 support
It hasn't existed for a long time and there are no current users.

Fixes #199
4 years ago
Brad Fitzpatrick 6b80bcf112 derp: remove a client round-trip waiting on serverInfo
It just has a version number in it and it's not really needed.
Instead just return it as a normal Recv message type for those
that care (currently only tests).

Updates #150 (in that it shares the same goal: initial DERP latency)
Updates #199 (in that it removes some DERP versioning)
4 years ago
Brad Fitzpatrick e64ab89712 derp/derpmap: add Bangalore and Tokyo 4 years ago
Brad Fitzpatrick 80d0b88a89 derp/derpmap: fix constructor argument order
Fix of 3e2bfe48c3
4 years ago
Ross Zurowski 3e2bfe48c3
derpmap: add full region name
We're beginning to reference DERP region names in the admin UI, so it's
best to consolidate this information in our DERP map.

Signed-off-by: Ross Zurowski <ross@rosszurowski.com>
4 years ago
Josh Bleecher Snyder 062bd67d3b derp: use rand instead of crypto/rand to generate jitter
We don't need crypto/rand. Let the OS keep its entropy bits.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
4 years ago
David Anderson 37c19970b3 derp: add a debug option to verbosely log drops to a destination.
Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
Josh Bleecher Snyder 909c165382 derp: remove two key.Public allocations
Reading and writing a [32]byte key to a bufio.Reader/bufio.Writer
can easily by done without allocating. Do so.

It is slower; on my machine, it adds about 100ns per read/write.
However, the overall request takes a minimum of several µs,
and it cuts allocations meaningfully, so it is probably worth it.

name                      old time/op    new time/op    delta
SendRecv/msgsize=10-8       9.21µs ± 9%    9.08µs ± 8%     ~     (p=0.250 n=15+15)
SendRecv/msgsize=100-8      6.51µs ± 9%    6.60µs ± 7%     ~     (p=0.259 n=15+13)
SendRecv/msgsize=1000-8     7.24µs ±13%    7.61µs ±36%     ~     (p=1.000 n=11+15)
SendRecv/msgsize=10000-8    19.5µs ±15%    19.9µs ±25%     ~     (p=0.890 n=14+15)

name                      old speed      new speed      delta
SendRecv/msgsize=10-8     1.09MB/s ± 8%  1.10MB/s ± 8%     ~     (p=0.286 n=15+15)
SendRecv/msgsize=100-8    15.4MB/s ± 8%  15.1MB/s ± 6%     ~     (p=0.129 n=15+12)
SendRecv/msgsize=1000-8    139MB/s ±15%   135MB/s ±28%     ~     (p=1.000 n=11+15)
SendRecv/msgsize=10000-8   516MB/s ±17%   506MB/s ±21%     ~     (p=0.880 n=14+15)

name                      old alloc/op   new alloc/op   delta
SendRecv/msgsize=10-8         170B ± 1%      108B ± 1%  -36.63%  (p=0.000 n=15+15)
SendRecv/msgsize=100-8        265B ± 1%      203B ± 1%  -23.34%  (p=0.000 n=15+15)
SendRecv/msgsize=1000-8     1.18kB ± 1%    1.12kB ± 0%   -5.31%  (p=0.000 n=14+14)
SendRecv/msgsize=10000-8    18.8kB ± 2%    18.8kB ± 2%     ~     (p=0.443 n=12+12)

name                      old allocs/op  new allocs/op  delta
SendRecv/msgsize=10-8         4.00 ± 0%      2.00 ± 0%  -50.00%  (p=0.000 n=15+15)
SendRecv/msgsize=100-8        4.00 ± 0%      2.00 ± 0%  -50.00%  (p=0.000 n=15+15)
SendRecv/msgsize=1000-8       4.00 ± 0%      2.00 ± 0%  -50.00%  (p=0.000 n=15+15)
SendRecv/msgsize=10000-8      5.00 ± 0%      3.00 ± 0%  -40.00%  (p=0.000 n=13+14)

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
4 years ago
Brad Fitzpatrick 75225368a4 derp: fix 32-bit struct field alignment 4 years ago
David Anderson 15949ad77d derp: export the new expvar. 4 years ago
David Anderson 13661e195a derp: rename "wireguard" packet type to "other".
Strictly speaking, we don't know that it's a wireguard packet, just that
it doesn't look like a disco packet.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
David Anderson 1b5b59231b derp: break down received packets by kind (disco vs. wireguard).
Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
Josh Bleecher Snyder e577303dc7 derp: make writeUint32 and readUint32 not allocate
The allocations are small, but they're easy enough to avoid.
And it removes some clutter from the pprof output.

name                      old time/op    new time/op    delta
SendRecv/msgsize=10-8       10.1µs ± 9%     9.7µs ± 7%    -3.45%  (p=0.035 n=14+14)
SendRecv/msgsize=100-8      8.12µs ± 7%    7.38µs ± 9%    -9.02%  (p=0.000 n=15+15)
SendRecv/msgsize=1000-8     9.51µs ±25%    8.76µs ±22%      ~     (p=0.202 n=15+15)
SendRecv/msgsize=10000-8    21.1µs ±25%    19.9µs ±14%      ~     (p=0.270 n=15+14)
WriteUint32-8               25.1ns ± 4%    21.3ns ±12%   -15.01%  (p=0.000 n=14+14)
ReadUint32-8                35.4ns ± 4%    21.9ns ± 4%   -38.06%  (p=0.000 n=15+15)

name                      old alloc/op   new alloc/op   delta
SendRecv/msgsize=10-8         182B ± 2%      169B ± 1%    -7.22%  (p=0.000 n=15+13)
SendRecv/msgsize=100-8        282B ± 1%      265B ± 1%    -5.85%  (p=0.000 n=15+15)
SendRecv/msgsize=1000-8     1.19kB ± 1%    1.18kB ± 0%    -1.26%  (p=0.000 n=14+15)
SendRecv/msgsize=10000-8    19.3kB ± 4%    18.7kB ± 4%    -3.44%  (p=0.006 n=12+12)
WriteUint32-8                4.00B ± 0%     0.00B       -100.00%  (p=0.000 n=15+15)
ReadUint32-8                 4.00B ± 0%     0.00B       -100.00%  (p=0.000 n=15+15)

name                      old allocs/op  new allocs/op  delta
SendRecv/msgsize=10-8         8.00 ± 0%      4.00 ± 0%   -50.00%  (p=0.000 n=15+15)
SendRecv/msgsize=100-8        8.00 ± 0%      4.00 ± 0%   -50.00%  (p=0.000 n=15+15)
SendRecv/msgsize=1000-8       8.00 ± 0%      4.00 ± 0%   -50.00%  (p=0.000 n=15+15)
SendRecv/msgsize=10000-8      8.47 ±17%      5.00 ± 0%   -40.94%  (p=0.000 n=15+14)
WriteUint32-8                 1.00 ± 0%      0.00       -100.00%  (p=0.000 n=15+15)
ReadUint32-8                  1.00 ± 0%      0.00       -100.00%  (p=0.000 n=15+15)

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
4 years ago
Josh Bleecher Snyder 355c6296f0 derp: add readUint32 and writeUint32 benchmarks
These aren't particularly performance critical,
but since I have an optimization pending for them,
it's worth having a corresponding benchmark.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
4 years ago
Josh Bleecher Snyder d65e2632ab derp: add basic benchmark
This benchmark is far from perfect: It mixes together
client and server. Still, it provides a starting point
for easy profiling.

Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>
4 years ago
Josh Bleecher Snyder b23f2263c1 derp: add server version to /debug, expvars
This will make it easier for a human to tell what
version is deployed, for (say) correlating line numbers
in profiles or panics to corresponding source code.

It'll also let us observe version changes in prometheus.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
4 years ago
David Anderson c3994fd77c derp: remove OnlyDisco option.
Active discovery lets us introspect the state of the network stack precisely
enough that it's unnecessary, and dropping the initial DERP packets greatly
slows down tests. Additionally, it's unrealistic since our production network
will never deliver _only_ discovery packets, it'll be all or nothing.

Signed-off-by: David Anderson <danderson@tailscale.com>
4 years ago
Brad Fitzpatrick 69f3ceeb7c derp/derphttp: don't return all nil from dialRegion when STUNOnly nodes 4 years ago
Brad Fitzpatrick 52969bdfb0 derp: fix atomic padding on 32-bit again
Broken by earlier OnlyDisco addition.
4 years ago
Brad Fitzpatrick a6559a8924 wgengine/magicsock: run test DERP in mode where only disco packets allowed
So we don't accidentally pass a NAT traversal test by having DERP pick up our slack
when we really just wanted DERP as an OOB messaging channel.
4 years ago
Brad Fitzpatrick c1cabe75dc derp: fix server struct fielfd alignment on 32-bit
Mostly so the GitHub CI will pass on 32-bit.
4 years ago
Brad Fitzpatrick 4732722b87 derp: add frameClosePeer to move around clients within a region
For various reasons (mostly during rollouts or config changes on our
side), nodes may end up connecting to a fallback DERP node in a
region, rather than the primary one we tell them about in the DERP
map.

Connecting to the "wrong" node is fine, but it's in our best interest
for all nodes in a domain to connect to the same node, to reduce
intra-region packet forwarding.

This adds a privileged frame type used by the control system that can
kick off a client connection when they're connected to the wrong node
in a region. Then they hopefully reconnect immediately to the correct
location. (If not, we can leave them alone and stop closing them.)

Updates tailscale/corp#372
4 years ago
Brad Fitzpatrick dd43d9bc5f derp: fix varz typo
Updates tailscale/corp#391
4 years ago
Brad Fitzpatrick b87396b5d9 cmd/derper, derp: add some more varz and consistency check handler
I'm trying to hunt down a slow drift in numbers not agreeing.
4 years ago
Brad Fitzpatrick 6fbd1abcd3 derp: update peerGone code to work with regional DERP mesh clusters too
Updates #150
Updates #388
4 years ago
Brad Fitzpatrick c8cf3169ba cmd/derper, derp/derphttp: move bulk of derp mesh code into derphttp
To be reused in various other tools.
5 years ago
Brad Fitzpatrick 6757c990a8 Fix staticcheck warning, add Makefile with staticcheck targets, lock in staticcheck version in go.mod 5 years ago
Brad Fitzpatrick abd79ea368 derp: reduce DERP memory use; don't require callers to pass in memory to use
The magicsock derpReader was holding onto 65KB for each DERP
connection forever, just in case.

Make the derp{,http}.Client be in charge of memory instead. It can
reuse its bufio.Reader buffer space.
5 years ago
Brad Fitzpatrick 07ca0c1c29 derp: fix tracking problem if conn starts local, then also joins mesh peer 5 years ago
Brad Fitzpatrick 1cb7dab881 cmd/derper: support forwarding packets amongst set of peer DERP servers
Updates #388

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 5e0ff494a5 derp: change NewClient constructor to an option pattern
(The NewMeshClient constructor I added recently was gross in
retrospect at call sites, especially when it wasn't obvious that a
meshKey empty string meant a regular client)
5 years ago
Brad Fitzpatrick 4d599d194f derp, derp/derphttp: add key accessors, add Client.RecvDetail
Client.RecvDetail returns a connection generation so interested clients
can detect when a reconnect happened. (Will be needed for #388)
5 years ago
Brad Fitzpatrick b33c86b542 derp: add an unexported key.Public zero value variable to be less verbose 5 years ago
Brad Fitzpatrick b663ab4685 cmd/derper: treat self-connection connection watch as no-op
Updates #388
5 years ago
Brad Fitzpatrick 484b7fc9a3 derp, cmd/derper: add frameWatchConns, framePeerPresent for inter-DERP routing
This lets a trusted DERP client that knows a pre-shared key subscribe
to the connection list. Upon subscribing, they get the current set
of connected public keys, and then all changes over time.

This lets a set of DERP server peers within a region all stay connected to
each other and know which clients are connected to which nodes.

Updates #388

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 24009241bf net/netns: move SOCKS dialing to netns for now
This lets control & logs also use SOCKS dials.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick cf0d19f0ab net/tlsdial, derp/derphttp: finish DERPNode.CertName validation 5 years ago
Brad Fitzpatrick becce82246 net/netns, misc tests: remove TestOnlySkipPrivilegedOps, argv checks
The netns UID check is sufficient for now. We can do something else
later if/when needed.
5 years ago
Brad Fitzpatrick 7f68e097dd net/netcheck: fix HTTPS fallback bug from earlier today
My earlier 3fa58303d0 tried to implement
the net/http.Tranhsport.DialTLSContext hook, but I didn't return a
*tls.Conn, so we ended up sending a plaintext HTTP request to an HTTPS
port. The response ended up being Go telling as such, not the
/derp/latency-check handler's response (which is currently still a
404). But we didn't even get the 404.

This happened to work well enough because Go's built-in error response
was still a valid HTTP response that we can measure for timing
purposes, but it's not a great answer. Notably, it means we wouldn't
be able to get a future handler to run server-side and count those
latency requests.
5 years ago
David Anderson 5114df415e net/netns: set the bypass socket mark on linux.
This allows tailscaled's own traffic to bypass Tailscale-managed routes,
so that things like tailscale-provided default routes don't break
tailscaled itself.

Progress on #144.

Signed-off-by: David Anderson <danderson@tailscale.com>
5 years ago