tailscale

Commit Graph

Author	SHA1	Message	Date
Brad Fitzpatrick	db2436c7ff	wgengine/magicsock: don't interrupt endpoint updates, merge all mutex into one Before, endpoint updates were constantly being interrupted and resumed on Linux due to tons of LinkChange messages from over-zealous Linux netlink messages (from router_linux.go) Now that endpoint updates are fast and bounded in time anyway, just let them run to completion, but note that another needs to be scheduled after. Now logs went from pages of noise to just: root@taildoc:~# grep -i -E 'stun\|endpoint update' log 2020/03/13 08:51:29 magicsock.Conn: starting endpoint update (initial) 2020/03/13 08:51:30 magicsock.Conn.ReSTUN: endpoint update active, need another later ("link-change-minor") 2020/03/13 08:51:31 magicsock.Conn: starting endpoint update (link-change-minor) 2020/03/13 08:51:31 magicsock.Conn.ReSTUN: endpoint update active, need another later ("link-change-minor") 2020/03/13 08:51:33 magicsock.Conn: starting endpoint update (link-change-minor) 2020/03/13 08:51:33 magicsock.Conn.ReSTUN: endpoint update active, need another later ("link-change-minor") 2020/03/13 08:51:35 magicsock.Conn: starting endpoint update (link-change-minor) 2020/03/13 08:51:35 magicsock.Conn.ReSTUN: endpoint update active, need another later ("link-change-minor") Or, seen in another run: 2020/03/13 08:45:41 magicsock.Conn: starting endpoint update (periodic) 2020/03/13 08:46:09 magicsock.Conn: starting endpoint update (periodic) 2020/03/13 08:46:21 magicsock.Conn: starting endpoint update (link-change-major) 2020/03/13 08:46:37 magicsock.Conn: starting endpoint update (periodic) 2020/03/13 08:47:05 magicsock.Conn: starting endpoint update (periodic) Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	db31550854	wgengine: don't Reconfig on boring link changes Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	b9c6d3ceb8	netcheck: work behind UDP-blocked networks again, add tests Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	bc73dcf204	wgengine/magicsock: don't block in Send waiting for derphttp.Send Fixes #137 Updates #109 Updates #162 Updates #163 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	8807913be9	wgengine/magicsock: wait for previous DERP goroutines to end before new ones Updates #109 (hopefully fixes, will wait for graphs to be happy) Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	eff6dcdb4e	wgengine/magicsock: log more about why we're re-STUNing	5 years ago
Brad Fitzpatrick	b3ddf51a15	wgengine/magicsock: add a pointer value for logging Updates #109 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	b0f8931d26	wgengine/magicsock: make a test signature a bit more explicit	5 years ago
David Crawshaw	7ec54e0064	wgengine/magicsock: remove TODO The TODO above derphttp.NewClient suggests it does network I/O, but the derphttp client connects lazily and so creating one is very cheap. Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	5 years ago
Brad Fitzpatrick	01b4bec33f	stunner: re-do how Stunner works It used to make assumptions based on having Anycast IPs that are super near. Now we're intentionally going to a bunch of different distant IPs to measure latency. Also, optimize how the hairpin detection works. No need to STUN on that socket. Just use that separate socket for sending, once we know the other UDP4 socket's endpoint. The trick is: make our test probe also a STUN packet, so it fits through magicsock's existing STUN routing. This drops netcheck from ~5 seconds to ~250-500ms. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
David Anderson	77af7e5436	wgengine/magicsock: mark test logfunc as a helper. Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
David Anderson	7eda3af034	wgengine/magicsock: clean up derp http servers on shutdown. Failure to do this leads to fd exhaustion at -count=10000, and increasingly poor execution north of -count=100. Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
David Anderson	d651715528	wgengine/magicsock: synchronize test STUN shutdown. Failure to do so triggers either a data race or a panic in the testing package, due to racey use of t.Logf. Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
David Anderson	86baf60bd4	wgengine/magicsock: synchronize epUpdate cleanup on shutdown. Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
Brad Fitzpatrick	023df9239e	Move linkstate boring change filtering to magicsock So we can at least re-STUN on boring updates. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
David Anderson	592fec7606	wgengine/magicsock: move device close to uncursed portion of test. Device close used to suffer from deadlocks, but no longer. Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
Brad Fitzpatrick	a265d7cbff	wgengine/magicsock: in STUN-disabled test mode, let endpoint discovery proceed	5 years ago
Brad Fitzpatrick	5c1e443d34	wgengine/monitor: don't call LinkChange when interfaces look unchanged Basically, don't trust the OS-level link monitor to only tell you interesting things. Sanity check it. Also, move the interfaces package into the net directory now that we have it.	5 years ago
Brad Fitzpatrick	39c0ae1dba	derp/derpmap: new DERP config package, merge netcheck into magicsock more Fixes #153 Updates #162 Updates #163 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	4800926006	wgengine/magicsock: add AddrSet appendDests+UpdateDst tests	5 years ago
David Crawshaw	e201f63230	magicsock: unskip tests that are reliable Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	5 years ago
David Anderson	bb93d7aaba	wgengine/magicsock: plumb logf throughout, and expose in Options. Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
Brad Fitzpatrick	f42b9b6c9a	wgengine/magicsock: don't discard UDP packet on UDP+DERP race Fixes #155 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
David Anderson	e3172ae267	wgengine/magicsock: uncurse TestDeviceStartStop, let CI run it. Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
David Anderson	f265603110	wgengine/magicsock: fix data race in ReceiveIPv4. The UDP reader goroutine was clobbering `n` and `err` from the main goroutine, whose accesses are not synchronized the way `b` is. Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
David Anderson	77354d4617	wgengine/magicsock: unblock wireguard-go's read on magicsock shutdown. wireguard-go closes magicsock, and expects this to unblock reads so that its internal goroutines can wind down. We were incorrectly blocking the read indefinitey and breaking this contract. Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
David Anderson	fdee5fb639	wgengine/magicsock: don't mutexly reach inside Conn to tweak DERP settings. Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
David Anderson	643bf14653	wgengine/magicsock: disable the new ping test. It's extremely flaky in several dimensions, as well as very slow. It's making the CI completely red all the time without telling us useful information. Set RUN_CURSED_TESTS=1 to run locally.	5 years ago
David Anderson	c8ebac2def	wgengine/magicsock: try deflaking again. This change just alters the semantics of the one flaky test, without trying to speed up timeouts on the others. Empirically, speeding up the timeouts causes _more_ flakes right now :(	5 years ago
David Anderson	cd1ac63b4c	Revert "wgengine/magicsock: temporarily deflake." This reverts commit `c5835c6ced`.	5 years ago
David Anderson	c5835c6ced	wgengine/magicsock: temporarily deflake. The remaining flake occurs due to a mysterious packet loss. This doesn't affect normal tailscaled operations, so until I track down where the loss occurs and fix it, the flaky test is going to be lenient about packet loss (but not about whether the spray logic worked). Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
Brad Fitzpatrick	61d83f759b	wgengine/magicsock: remove redundant derpMagicIP comparison Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
David Anderson	bd60a750e8	wgengine/magicsock: fix packet spraying test to (mostly) pass. It previously passed incorrectly due to bugs. With those fixed, it becomes flaky for 2 reasons. One of them is the wireguard handshake race, which can eat the 1st sprayed packet and prevent roamAddr discovery. This change fixes that failure, by spreading the test traffic out enough that additional spraying occurs. Signed-Off-By: David Anderson <danderson@tailscale.com>	5 years ago
David Anderson	ef31dd7bb5	wgengine/magicsock: check all 3 fast paths independently. The previous code would skip the DERP short-circuit if roamAddr was set, which is not what we wanted. More generally, hitting any of the fast path conditions is a direct return, so we can just have 3 standalone branches rather than 'else if' stuff. Signed-Off-By: David Anderson <danderson@tailscale.com>	5 years ago
David Anderson	05a52746a4	wgengine/magicsock: fix destination selection logic to work with DERP. The effect is subtle: when we're not spraying packets, and have not yet figured out a curAddr, and we're not spraying, we end up sending to whatever the first IP is in the iteration order. In English, that means "when we have no idea where to send packets, and we've given up on sending to everyone, just send to the first addr we see in the list." This is, in general, what we want, because the addrs are in sorted preference order, low to high, and DERP is the least preferred destination. So, when we have no idea where to send, send to DERP, right? ... Except for very historical reasons, appendDests iterated through addresses in _reverse_ order, most preferred to least preferred. crawshaw@ believes this was part of the earliest handshaking algorithm magicsock had, where it slowly iterated through possible destinations and poked handshakes to them one at a time. Anyway, because of this historical reverse iteration, in the case described above of "we have no idea where to send", the code would end up sending to the _most_ preferred candidate address, rather than the _least_ preferred. So when in doubt, we'd end up firing packets into the blackhole of some LAN address that doesn't work, and connectivity would not work. This case only comes up if all your non-DERP connectivity options have failed, so we more or less failed to detect it because we didn't have a pathological test box deployed. Worse, codependent bug `2839854994` made DERP accidentally work sometimes anyway by incorrectly exploiting roamAddr behavior, albeit at the cost of making DERP traffic symmetric. In fixing DERP to once again be asymmetric, we effectively removed the bandaid that was concealing this bug. Signed-Off-By: David Anderson <danderson@tailscale.com>	5 years ago
David Anderson	97e58ad44d	wgengine/magicsock: only set addrByKey once in CreateEndpoint. Signed-Off-By: David Anderson <danderson@tailscale.com>	5 years ago
Brad Fitzpatrick	fbab12c94c	wgengine/magicsock: skip netcheck if external STUN aren't in use Updates #146 (not a complete fix yet probably)	5 years ago
Brad Fitzpatrick	fe0051fafd	wgengine/magicsock: expand AddrSet.addrs comment	5 years ago
David Anderson	2839854994	wgengine/magicsock: never set a DERP server as a roamAddr. DERP traffic is asymmetric by design, with nodes always sending to their peer's home DERP server. However, if roamAddr is set, magicsock will always push data there, rather than let DERP server selection do its thing, so we end up accidentally creating a symmetric flow. Signed-Off-By: David Anderson <danderson@tailscale.com>	5 years ago
David Anderson	4f5c0da1ae	wgengine/magicsock: log when home DERP server changes.	5 years ago
Brad Fitzpatrick	6978b93bdd	derp, magicsock: track home (preferred) vs visiting connections for stats	5 years ago
Brad Fitzpatrick	12b77f30ad	wgengine/magicsock: close stale DERP connections	5 years ago
Brad Fitzpatrick	2cff9016e4	net/dnscache: add overly simplistic DNS cache package for selective use I started to write a full DNS caching resolver and I realized it was overkill and wouldn't work on Windows even in Go 1.14 yet, so I'm doing this tiny one instead for now, just for all our netcheck STUN derp lookups, and connections to DERP servers. (This will be caching a exactly 8 DNS entries, all ours.) Fixes #145 (can be better later, of course)	5 years ago
Brad Fitzpatrick	a36ccb8525	wgengine/magicsock: actually add to the activeDerp map Fixes bug just introduced in 8f9849c140; not tested enough :(	5 years ago
Brad Fitzpatrick	8f9849c140	wgengine/magicsock: collapse three DERP maps down into one	5 years ago
Brad Fitzpatrick	40ebba1373	magicsock: use [unexpected] convention more Fixes #136 (not entirely, but we have a convention now)	5 years ago
Brad Fitzpatrick	848a2bddf0	wgengine/magicsock: update set of DERP nodes	5 years ago
David Crawshaw	7932481b95	magicsock: lookup AddrSet by key from DERP Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	5 years ago
Brad Fitzpatrick	eac62ec5ff	ipn, wgengine/magicsock: add ipn.Prefs.DisableDERP bool Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	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

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82 Commits (6c3820e8c4434b4b547403dc37a5416ad6d6ddf8)