tailscale

Commit Graph

Author	SHA1	Message	Date
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
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	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	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	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	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
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
Maisem Ali	4d142ebe06	derp: handle net.ErrClosed in TestSendFreeze Signed-off-by: Maisem Ali <maisem@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	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	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	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
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
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.	4 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	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	1df3c8d02a	derp, netcheck: make tests listen on localhost only avoid macOS firewall pop-ups	5 years ago
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>	5 years ago
David Crawshaw	131541c06d	derp: deflake test Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	5 years ago
David Crawshaw	72dbf26f63	derp: test that client a->b and a->c relaying do not interfere Without the recent write deadline introduction, this test fails. They still do interfere, but the interference is now bound by the write deadline. Many improvements are possible. Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	5 years ago
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>	5 years ago
Brad Fitzpatrick	e733fa6f7e	derp: add some varz tests for active/home conns	5 years ago
Brad Fitzpatrick	bf704a5218	derp: protocol negotiation, add v2: send src pub keys to clients in packets Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	379a3125fd	derp, wgengine/magicsock: support more than just packets from Client.Recv Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	1166c34f6c	derp: fix staticcheck warning Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
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>	5 years ago
Brad Fitzpatrick	259406e797	derp: move away from [32]byte key types And some minor cleanup in the process. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Earl Lee	a8d8b8719a	Move Linux client & common packages into a public repo.	5 years ago

34 Commits (185825df1119796293a9ed2e31b5eecd7332c784)