Commit Graph

360 Commits (c3467fbadb7e2f28c3f786dfabdc13c173e62055)

Author SHA1 Message Date
Brad Fitzpatrick 45f2b53aca all: remove unnecessary trailing newlines in format patterns for consistency
And document on logger.Logf that it's unnecessary.
5 years ago
Brad Fitzpatrick a7e7c7b548 wgengine/magicsock: close derp connections on rebind
Fixes #276

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 614261d00d wgengine/magicsock: reset AddrSet states on Rebind
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick c0697e1feb net/interfaces: add IsExpensive and up state to State
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick a55c4217db wgengine: diagnose why CreateTUN might've failed for users
Fixes #273

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 3a3b64301e wgengine: quiet some engine reconfig logging, make more consistent
Updates #282

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 1ec27dbb5b wgengine: remove an allocation in reconfig
Minor.
5 years ago
David Crawshaw 5b95aa81ea wgengine: remove IpcSetOperation on LinkChange
This was only done occasionally, but was extremely disruptive
when done and is no longer necessary.

It used to be that when switching links, we had to immediately
generate handshakes to everyone we were communicating with to
punch a hole in any NAT we were talking through. (This ended up
not really working, because in the process we got rid of our
session keys and ended up having a futile conversation for many
seconds.)

Now we have DERP, our link change propogates to the other side
as a new list of endpoints, so they start spraying packets.
We will definitely get one thanks to DERP, which will cause us
to spray, opening any NAT we are behind.

The result is that for good connections, we don't trash session
keys and cause an interruption.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
Brad Fitzpatrick 922d9546bf wgengine: don't allocate so much in userspaceEngine.getStatus
It was one of the top garbage producers on my phone.

It's slated to be deleted and replaced anyway, but this helps in the
meantime.

The go.sum changes look scary, but the new dep only adds 240 bytes to
the binary. The go.sum noise is just cmd/go being aggressive in
including a lot of stuff (which is being fixed in Go 1.15, for what I
understand). And I ran a go mod tidy, which added some too. (I had to
write a custom wrapper around go mod tidy because this mod tidy
normally breaks on tailscale.io/control being missing but referenced
in tests)

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 0f64d7f9cc wgengine: remove a tiny allocation
Drop in the bucket compared to the larger issues, but noticed it
when looking at pprof.
5 years ago
Blake Gentry e19287f60f wgengine/magicsock: fix Conn docs type reference
The docs on magicsock.Conn stated that they implemented the
wireguard/device.Bind interface, yet this type does not exist. In
reality, the Conn type implements the wireguard/conn.Bind interface.

I also fixed a small typo in the same file.

Signed-off-by: Blake Gentry <blakesgentry@gmail.com>
5 years ago
Brad Fitzpatrick 50aeb5b9ad wgengine: unexport some windows funcs 5 years ago
Brad Fitzpatrick 322499473e cmd/tailscaled, wgengine, ipn: add /debug/ipn handler with world state
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 2d48f92a82 wgengine/magicsock: re-stun every [20,27] sec, not 28
28 is cutting it close, and we think jitter will help some spikes
we're seeing.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 577f321c38 wgengine/magicsock: revise derp fallback logic
Revision to earlier 6284454ae5

Don't be sticky if we have no peers.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 2e420ad8b6 wgengine, wgengine/filter: minor doc, style, performance, locking changes
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 6284454ae5 wgengine/magicsock: if UDP blocked, pick DERP where most peers are
Updates #207

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Avery Pennarun f53e78e0d5 wgengine: don't lose filter state on filter reconfig.
We were abandoning the UDP port LRU every time we got a new packet
filter from tailcontrol, which caused return packets to suddenly stop
arriving.
5 years ago
Brad Fitzpatrick d321190578 wgengine/magicsock: stringify [IPv6]:port normally in AddrSet.String 5 years ago
Brad Fitzpatrick 3c3ea8bc8a wgengine/magicsock: finish IPv6 transport support
DEBUG_INCLUDE_IPV6=1 is still required, but works now.

Updates #18 (fixes it, once env var gate is removed)
5 years ago
Brad Fitzpatrick 82ed7e527e wgengine/magicsock: remove log allocation
This was the whole point but I goofed at the last line.
5 years ago
Brad Fitzpatrick 8454bbbda5 wgengine/magicsock: more logging improvements
* remove endpoint discovery noise when results unchanged
* consistently spell derp nodes as "derp-N"
* replace "127.3.3.40:" with "derp-" in CreateEndpoint log output
* stop early DERP setup before SetPrivateKey is called;
  it just generates log nosie
* fix stringification of peer ShortStrings (it had an old %x on it,
  rendering it garbage)
* describe why derp routes are changing, with one of:
  shared home, their home, our home, alt
5 years ago
Brad Fitzpatrick 680311b3df wgengine/magicsock: fix few remaining logs without package prefix 5 years ago
Brad Fitzpatrick c473927558 wgengine/magicsock: clean up, add, improve DERP logs 5 years ago
Brad Fitzpatrick ea9310403d wgengine/magicsock: re-STUN on DERP connection death
Fixes #201
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
Brad Fitzpatrick b6f77cc48d wgengine/magicsock: return early, outdent in derpWriteChanOfAddr 5 years ago
Brad Fitzpatrick dd31285ad4 wgengine/magicsock: send IPv6 using pconn6, if available
In prep for IPv6 support. Nothing should make it this far yet.
5 years ago
Brad Fitzpatrick af277a6762 controlclient, magicsock: add debug knob to request IPv6 endpoints
Add opt-in method to request IPv6 endpoints from the control plane.
For now they should just be skipped. A previous version of this CL was
unconditional and reportedly had problems that I can't reproduce. So
make it a knob until the mystery is solved.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 221e7d7767 wgengine/magicsock: make log message include DERP port (node) 5 years ago
Brad Fitzpatrick 33bdcabf03 wgengine/magicsock: call stun callback w/ only valid part of STUN packet 5 years ago
David Anderson 0be475ba46 Revert "tailcfg, controlclient, magicsock: request IPv6 endpoints, but ignore them"
Breaks something deep in wireguard or magicsock's brainstem, no packets at all
can flow. All received packets fail decryption with "invalid mac1".

This reverts commit 94024355ed.

Signed-off-by: David Anderson <dave@natulte.net>
5 years ago
Brad Fitzpatrick 94024355ed tailcfg, controlclient, magicsock: request IPv6 endpoints, but ignore them
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 60ea635c6d wgengine/magicsock: delete inaccurate comment
I meant to include this in the earlier commit.
5 years ago
Brad Fitzpatrick a184e05290 wgengine/magicsock: listen on udp6, use it for STUN, report endpoint
More steps towards IPv6 transport.

We now send it to tailcontrol, which ignores it.

But it doesn't actually actually support IPv6 yet (outside of STUN).

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 7caa288213 wgengine/magicsock: rename pconn field to pconn4, in prep for pconn6 5 years ago
David Crawshaw addbdce296 wgengine, ipn: include number of active DERPs in status
Use this when making the ipn state transition from Starting to
Running. This way a network of quiet nodes with no active
handshaking will still transition to Active.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
David Crawshaw 1ad78ce698 magicsock: reconnect to home DERP on key change
Typically the home DERP server is found and set on startup before
magicsock's SetPrivateKey can be called, so no DERP connection is
established. Make sure one is by kicking the home DERP tires in
SetPrivateKey.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
David Crawshaw 455ba751d9 magicsock: start connection to HOME derp immediately
The code as written intended to do this, but it repeated the
comparison of derpNum and c.myDerp after c.myDerp had been
updated, so it never executed.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
David Anderson 315a5e5355 scripts: add a license header checker.
Signed-off-by: David Anderson <dave@natulte.net>
5 years ago
Brad Fitzpatrick e085aec8ef all: update to wireguard-go API changes
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
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 Crawshaw 0f73070a57 wgengine: shut down wireguard on Close
This was (presumably) missing from wgengine because the
interactions between magicsock and wireguard-go meant that the
shutdown never worked. Now those are fixed, actually shut down.

Fixes occasional flake in expanded ipn/e2e_test.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
David Crawshaw ce7f6b2df1 wgengine: have pinger use all single-IP routes
Fixes #139

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
Martin Baillie 8ae3ba0cf5 wgengine: define default tunname for each platform
The device name "tailscale0" will be used for all platforms except for
OpenBSD where "tun" is enforced by the kernel. `CreateTUN()` in
`wireguard-go` will select the next available "tunX" device name on the
OpenBSD system.

Signed-off-by: Martin Baillie <martin@baillie.email>
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
David Crawshaw a65b2a0efd magicsock: add some DERP tests
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
David Crawshaw a33419167b magicsock: plumb through derpTLSConfig variable (for testing)
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
David Crawshaw caec2c7e8b magicsock: test sequence of pings
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
David Crawshaw 9f584414d9 magicsock: simple ping test via magicsock
Passes `go test -count=20 -race ./wgengine/magicsock`

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
David Crawshaw 34859f8e7d wgengine, magicsock: add a CreateBind method
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
David Crawshaw 75e62d318f magicsock: use local STUN server in tests
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
Brad Fitzpatrick b27d4c017a magicsock, wgengine, ipn, controlclient: plumb regular netchecks to map poll
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 724c37fb41 wgengine/magicsock: start tracking nearest DERP node 5 years ago
Brad Fitzpatrick 89a2c3eb04 wgengine: don't create duplicate iptables rules on Linux, clean up
Fixes #131

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 657f9593ae Reduce some logspam. 5 years ago
Brad Fitzpatrick 4675c70464 wgengine/magicsock: check STUN regularly 5 years ago
Brad Fitzpatrick bc7bc43fb8 magicsock, interfaces: move some code from magicsock to interfaces 5 years ago
Brad Fitzpatrick af7a01d6f0 wgengine/magicsock: drop donec channel, rename epUpdateCtx to serve its purpose 5 years ago
David Crawshaw cc4afa775f magicsock: rate limit send error log messages
The x/time/rate dependency adds 24kb to tailscaled binary size.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
David Crawshaw 0752c77dc2 magicsock: keep DERP magic IPs out of the address map
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
David Crawshaw c6550135d5 magicsock: remove the index from indexedAddrs
The value predates the introduction of AddrSet which replaces
the index by tracking curAddr directly.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
David Crawshaw d417be6a4b controlclinet: clone filter.MatchAllowAll
This avoids a non-obvious data race, where the JSON decoder ends
up creating do-nothing writes into global variables.

	==================
	WARNING: DATA RACE
	Write at 0x0000011e1860 by goroutine 201:
	  tailscale.com/wgengine/packet.(*IP).UnmarshalJSON()
	      /home/crawshaw/repo/corp/oss/wgengine/packet/packet.go:83 +0x2d9
	  encoding/json.(*decodeState).literalStore()
	      /home/crawshaw/go/go/src/encoding/json/decode.go:877 +0x445e
	...
	  encoding/json.Unmarshal()
	      /home/crawshaw/go/go/src/encoding/json/decode.go:107 +0x1de
	  tailscale.com/control/controlclient.(*Direct).decodeMsg()
	      /home/crawshaw/repo/corp/oss/control/controlclient/direct.go:615 +0x1ab
	  tailscale.com/control/controlclient.(*Direct).PollNetMap()
	      /home/crawshaw/repo/corp/oss/control/controlclient/direct.go:525 +0x1053
	  tailscale.com/control/controlclient.(*Client).mapRoutine()
	      /home/crawshaw/repo/corp/oss/control/controlclient/auto.go:428 +0x3a6
	Previous read at 0x0000011e1860 by goroutine 86:
	  tailscale.com/wgengine/filter.matchIPWithoutPorts()
	      /home/crawshaw/repo/corp/oss/wgengine/filter/match.go:108 +0x91
	  tailscale.com/wgengine/filter.(*Filter).runIn()
	      /home/crawshaw/repo/corp/oss/wgengine/filter/filter.go:147 +0x3c6
	  tailscale.com/wgengine/filter.(*Filter).RunIn()
	      /home/crawshaw/repo/corp/oss/wgengine/filter/filter.go:127 +0xb0
	  tailscale.com/wgengine.(*userspaceEngine).SetFilter.func1()
	      /home/crawshaw/repo/corp/oss/wgengine/userspace.go:390 +0xfc
	  github.com/tailscale/wireguard-go/device.(*Device).RoutineDecryption()
	      /home/crawshaw/repo/corp/wireguard-go/device/receive.go:295 +0xa1f

For #112

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
Brad Fitzpatrick 1abf2da392 wgengine/magicsock: reset favorite address on handshakes
Updates #92 (not a complete fix; could be better/faster?)

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 67ede8d6d2 wgengine, magicsock: fix SetPrivateKey data race
Updates #112

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 19b54d0ae7 wgengine: fix a data race on StatusCallback
Updates tailscale/tailscale#112

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
David Crawshaw c576a57067 wgengine: avoid holding any locks during HandshakeDone
Because wgLock is held while some wireguard-go methods run,
trying to hold wgLock during HandshakeDone potentially creates
lock cycles between wgengine and internals of wireguard-go.

Arguably wireguard-go should call HandshakeDone in a new goroutine,
but until its API promises that, don't make any assumptions here.

Maybe for #110.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
Brad Fitzpatrick c185e6b4b0 stunner: support IPv6, add latency info to callbacks, use unique TxIDs per retry
And some more docs.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
David Crawshaw 44670d0da9 wgengine: revert wgdev.Close on Close from last commit
Causes as-yet-unknown problems in some tests.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
wardn 9390a3ef55 wgengine: properly clean up freebsd routes and interfaces on close
Signed-off-by: wardn <wardn@users.noreply.github.com>
5 years ago
David Crawshaw 7a3be96199 wgengine: add pinger to generate initial spray packets
For 3 seconds after a successful handshake, wgengine will send a
ping packet every 300ms to its peer. This ensures the spray logic
in magicsock has something to spray.

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
David Crawshaw a6ad3c46e2 magicsock: spray some normal packets after a handshake
In particular, this is designed to catch the case where a
HandshakeInitiation packet is sent out but the intermediate NATs
have not been primed, so the packet passes over DERP.
In that case, the HandshakeResponse also comes back over DERP,
and the connection proceeds via DERP without ever trying to punch
through the NAT.

With this change, the HandshakeResponse (which was sprayed out
and so primed one NAT) triggers an UpdateDst, which triggers
the extra spray logic.

(For this to work, there has to be an initial supply of packets
to send on to a peer for the three seconds following a handshake.
The source of these packets is left as a future exercise.)

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
Brad Fitzpatrick 8696b17b5f wgengine/magicsock: turn off DERP log spamminess by default
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 7a3b91390b wgengine/magicsock: fix crash in Send when Endpoint isn't an AddrSet
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
David Crawshaw 868cfae84f wgengine, magicsock: adjust for wireguard-go conn/device package split
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
wardn c51b8c206d wgengine: resolv.conf spelling corrections
Signed-off-by: wardn <wardn@users.noreply.github.com>
5 years ago
Brad Fitzpatrick cc7b9b0dff control/controlclient: fix priority of DERP server, add comment 5 years ago
Brad Fitzpatrick c02f4b5a1f control/controlclient: add temporary mechanism to force derp on
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 525bf1f3d2 wgengine/magicsock: remember fixed port number preference
So LinkChange events rebind to the same port when possible.
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
David Crawshaw 4ebc0fa70f wgengine: incremental update of peers on network map change
This is the first, and easier, part of incremental wireguard-go
reconfiguration. It means that a new node appearing on the
network does not cause all existing nodes to re-handshake with
the other nodes they are talking to.

(This code has been running on hello.ipn.dev for a few weeks and
peers have successfully reconnected to it through many network
map updates.)

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
Brad Fitzpatrick d298d5b1f8 wgengine/magicsock: support multiple derp servers, and not just for handshakes
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Martin Baillie a9bff99a9b wgengine: add OpenBSD router DNS update handling
Also removes validated TODO comments.

Signed-off-by: Martin Baillie <martin@baillie.email>
5 years ago
David Crawshaw 45d687e213 wgengine: fix build on linux/freebsd/openbsd/windows
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
David Crawshaw d0f697ee07 wgengine: update for wgcfg changes
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
5 years ago
Brad Fitzpatrick fd1aa4f7f6 wgengine/magicsock: add a reSTUN method
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick e06ca40650 wgengine, magicsock, derp: misc cleanups, docs
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
wardn 5d79530caa wgengine: create freebsd-specific implementation
Signed-off-by: wardn <wardn@users.noreply.github.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
Tobias Klauser 4d09316f9a wgengine/monitor: use RTMGRP_* consts from x/sys/unix
Bump golang.org/x/sys/unix to get the RTMGRP_* consts and use them.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
5 years ago
Brad Fitzpatrick 997678f540 wgengine/monitor: make Close not block forever on Linux
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 7f5e3febe5 wgengine: move link monitor to be owned by the engine, not the router
And make the monitor package portable with no-op implementations on
unsupported operating systems.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 79295b1138 wgengine: simplify, change some signatures
* make RouterGen return an error, not take both tunname and tundev
* also remove RouteGen taking a wireguard/device.Device; currently unused
* remove derp parameter (it'll work differently)
* unexport NewUserspaceRouter in per-OS impls, add documented wrapper

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 2896be60db Move "logger" package to under types, now that we have it.
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 587c3fcac4 control/controlclient, wgengine/magicsock: misc cleanups
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
wardn 58ce50389e wgengine: build for freebsd
Signed-off-by: wardn <wardn@users.noreply.github.com>
5 years ago
wardn 2cafbd74c7 monitor: refactor for architecture-specific connection implementations
Signed-off-by: wardn <wardn@users.noreply.github.com>
5 years ago
Brad Fitzpatrick c773abde77 wgengine: fix nil pointer deref crash from earlier change
Fixes #45
5 years ago
Brad Fitzpatrick 745c8c92b1 wgengine: fix windows build for winipcfg-go
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
David Anderson 36f5433476 wgengine: fix the build on darwin, windows, openbsd.
7e5e3277 changed the Router interface definition, but forgot to
fix up these platform files.

Signed-off-by: David Anderson <dave@natulte.net>
5 years ago
David Anderson 5c2deb66be wgengine: remove MTU TODO.
The MTU is currently set when creating the tun device,
elsewhere in the code. Maybe someday we'll want some kind
of per-platform MTU configuration here, but not in the
short-medium term.

Signed-off-by: David Anderson <dave@natulte.net>
5 years ago
David Anderson afa83358f7 wgenging: use logger.Logf type in openbsd router.
Signed-off-by: David Anderson <dave@natulte.net>
5 years ago
Martin Baillie 15f8c8dde4 wgengine: add initial rough OpenBSD implementation
Signed-off-by: Martin Baillie <martin@baillie.email>
5 years ago
Brad Fitzpatrick 7e5e32775a wgengine: flesh out some docs, minor cleanups
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
Brad Fitzpatrick 819daf10e2 wgengine: flesh out some docs
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
wardn 490e586eac wgengine: add required NewFakeRouter parameter
Signed-off-by: wardn <wardn@users.noreply.github.com>
5 years ago
Brad Fitzpatrick a59dc5f155 Use logger.Logf consistently. It was used in most places.
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
5 years ago
David Anderson 2f9cdd0aac wgengine: fix error string.
Signed-off-by: David Anderson <dave@natulte.net>
5 years ago
David Anderson 43becc4334 wgengine/packet: fix minor lint errors.
Signed-off-by: David Anderson <dave@natulte.net>
5 years ago
David Anderson a07906d1d8 wgengine: make SetRoutesFunc less appealing to use.
It exists as a way to glue the mac-specific xcode logic with the OSS
logic, and shouldn't be used by anything but the xcode glue.
5 years ago
David Crawshaw 87334fb332 wgengine, controlclient: fewer pointers in wgcfg key types
Signed-off-by: David Crawshaw <david@zentus.com>
5 years ago
Earl Lee a8d8b8719a Move Linux client & common packages into a public repo. 5 years ago