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55 Commits

Author SHA1 Message Date
Brad Fitzpatrick
52969bdfb0 derp: fix atomic padding on 32-bit again 
Broken by earlier OnlyDisco addition.
 2020-07-16 13:38:21 -07:00
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.
 2020-07-16 12:58:35 -07:00
Brad Fitzpatrick
c1cabe75dc derp: fix server struct fielfd alignment on 32-bit 
Mostly so the GitHub CI will pass on 32-bit.
 2020-07-07 09:08:15 -07:00
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
 2020-06-25 09:33:10 -07:00
Brad Fitzpatrick
dd43d9bc5f derp: fix varz typo 
Updates tailscale/corp#391
 2020-06-25 08:43:28 -07:00
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.
 2020-06-23 14:01:51 -07:00
Brad Fitzpatrick
6fbd1abcd3 derp: update peerGone code to work with regional DERP mesh clusters too 
Updates #150
Updates #388
 2020-06-22 10:06:42 -07:00
Brad Fitzpatrick
07ca0c1c29 derp: fix tracking problem if conn starts local, then also joins mesh peer 2020-06-05 12:53:43 -07:00
Brad Fitzpatrick
1cb7dab881 cmd/derper: support forwarding packets amongst set of peer DERP servers 
Updates #388

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-06-05 10:14:33 -07:00
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)
 2020-06-04 11:35:53 -07:00
Brad Fitzpatrick
b33c86b542 derp: add an unexported key.Public zero value variable to be less verbose 2020-06-04 11:28:00 -07:00
Brad Fitzpatrick
b663ab4685 cmd/derper: treat self-connection connection watch as no-op 
Updates #388
 2020-06-04 08:26:05 -07:00
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>
 2020-06-03 08:03:29 -07:00
Dmitry Adamushko
f2c2d0de68 derp/derp_server: unregisterClient() for replaced client connections. 
When unregistering a replaced client connection, move the
still-connected peers to the current client connecition. Inform
the peers that we've gone only when unregistering the active
client connection.

Signed-off-by: Dmitry Adamushko <da@stablebits.net>
 2020-04-10 08:52:30 -07:00
Dmitry Adamushko
44434fdc82 derp/derp_server: fixed unbalanced {register,unregister}Client() calls. 
Signed-off-by: Dmitry Adamushko <da@stablebits.net>
 2020-04-06 15:13:47 -07:00
Brad Fitzpatrick
1ab5b31c4b derp, magicsock: send new "peer gone" frames when previous sender disconnects 
Updates #150 (not yet enabled by default in magicsock)

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-03-22 21:00:47 -07:00
Brad Fitzpatrick
8c4cef60f8 derp: wait for send goroutine to finish before returning from run 
I saw a test flake due to the sender goroutine logging (ultimately to
t.Logf) after the server was closed.

This makes sure the all goroutines are cleaned up before Server.Close
returns.
 2020-03-22 13:10:07 -07:00
Brad Fitzpatrick
521ad7b0fc derp: only flush writes to clients when we're out of things to write 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-03-22 08:01:25 -07:00
Brad Fitzpatrick
0a25abcdaa derp: remove TODO comment 
It was done in bf704a5218
 2020-03-22 07:54:50 -07:00
Brad Fitzpatrick
8519a1b29f derp: revert rename of pkt to sendMsg 
New plan, sorry.

Most reverts 77921a31b1, except some doc changes.
 2020-03-21 22:17:22 -07:00
Brad Fitzpatrick
c34b350efa derp: remove the mutex around and closing of send channel 
Makes it less complicated.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-03-21 22:00:04 -07:00
Brad Fitzpatrick
77921a31b1 derp: rename pkt to sendMsg, in prep for other types of writes 
Updates #150
 2020-03-21 20:34:49 -07:00
Brad Fitzpatrick
1453aecb44 derp: add sclient.done channel, simplify some context passing 
This is mostly prep for a few future CLs, making sure we always have a
close-on-dead done channel available to select on when doing other
channel operations.
 2020-03-21 18:28:34 -07:00
David Anderson
ea90780066 derp: specify type of the by-reason drop varz. 
Signed-off-by: David Anderson <dave@natulte.net>
 2020-03-20 15:53:04 -07:00
Brad Fitzpatrick
fd824df1fa derp: export metric for server's initial MemStats.Sys reading 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-03-20 15:37:36 -07:00
David Anderson
64b5248929 derp: sprinkle comments and docstrings. 
Signed-off-by: David Anderson <dave@natulte.net>
 2020-03-20 15:14:01 -07:00
David Anderson
58b8ebd290 derp: add per-reason packet drop counter. 
In parallel with the summed counter for now, for dashboard migration.

Signed-off-by: David Anderson <dave@natulte.net>
 2020-03-20 15:14:01 -07:00
David Anderson
1e031001db derp: move write timeout to package constant. 
Signed-off-by: David Anderson <dave@natulte.net>
 2020-03-20 15:14:01 -07:00
David Anderson
dbfc916273 derp: add short queues between reader and writer, drop on overload. 
This avoids the server blocking on misbehaving or heavily contended
clients. We attempt to drop from the head of the queue to keep
overall queueing time lower.

Also:
 - fixes server->client keepalives, which weren't happening.
 - removes read rate-limiter, deferring instead to kernel-level
   global limiter/fair queuer.

Signed-off-by: David Anderson <dave@natulte.net>
 2020-03-20 15:14:01 -07:00
David Crawshaw
e838b3fb59 derp: use a write timeout when sending to clients 
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
 2020-03-12 14:42:48 -04:00
David Crawshaw
3df1b97ea8 derp: do not treat failure to relay as the fault of the sender 
If Alice attempts to send a packet to Bob and the DERP server
encounters an error on the socket to Bob, we should not disconnect
Alice for that.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
 2020-03-12 14:42:48 -04:00
David Crawshaw
43aa8595dd derp: introduce Conn interface 
This lets us test with something other than a net.Conn.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
 2020-03-12 14:42:48 -04:00
Brad Fitzpatrick
4fd29349b9 derp: add clients_replaced counter 
Updates #109
 2020-03-11 11:55:43 -07:00
Brad Fitzpatrick
5d8001d0ad derp: add varz for home moves 
Updates #162
Updates #163 (maybe)

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-03-09 11:09:27 -07:00
Brad Fitzpatrick
dd456f04c5 derp: actually record client's preferred bit 2020-03-05 19:02:54 -08:00
Brad Fitzpatrick
6978b93bdd derp, magicsock: track home (preferred) vs visiting connections for stats 2020-03-05 15:00:56 -08:00
Brad Fitzpatrick
bf704a5218 derp: protocol negotiation, add v2: send src pub keys to clients in packets 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-03-04 09:55:13 -08:00
Brad Fitzpatrick
e371520cc5 tsweb, derp: add expvar http.Handler for Prometheus's format 
And add some opinions.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-03-03 13:59:16 -08:00
Brad Fitzpatrick
d59d0576af derp: don't log on all dropped packets; super spammy 
Signed-off-by: Brad Fitzpatrick <brad@danga.com>
 2020-02-28 13:33:47 -08:00
Brad Fitzpatrick
752146a70f derp: clean up derphttp client code, use contexts 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-28 13:18:59 -08:00
Brad Fitzpatrick
3317531021 derp: fix JSON field typo, sort fields to make it easier to see inconsistencies 2020-02-21 14:18:09 -08:00
Brad Fitzpatrick
6cd81d5d1f derp: add more derp stats for dropped and received packets 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-21 14:13:50 -08:00
Brad Fitzpatrick
2612e54ad1 derp, cmd/derper: add debug handlers, stats 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-21 09:35:53 -08:00
Brad Fitzpatrick
379a3125fd derp, wgengine/magicsock: support more than just packets from Client.Recv 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-20 22:08:13 -08:00
Brad Fitzpatrick
88f1cc0c98 derp, cmd/derper: add rate limiting support, add default 5Mbps limit 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-20 15:26:30 -08:00
Brad Fitzpatrick
322cb58b14 derp: deflake test I flaked up in earlier change 
I broke an invariant in 11048b8932 (it was even nicely
documented then).

Also clean up the test a bit from while I was debugging it.

Fixes #84

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-20 14:41:39 -08:00
Brad Fitzpatrick
f029c4c82d derp: change the protocol framing to always include a length 
Addresses one of crawshaw's TODOs.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-20 13:37:44 -08:00
Brad Fitzpatrick
11048b8932 derp: add docs on current protocol overview, break accept apart a bit 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-20 09:57:05 -08:00
Brad Fitzpatrick
79af6054bf derp: don't start sending keepalives to client until after serverInfo sent 
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
 2020-02-20 09:34:01 -08:00
Brad Fitzpatrick
4b461c2e77 derp: rename some things in the server, add some docs 2020-02-20 08:50:25 -08:00