Commit Graph

1194 Commits (20324eeebc97d339561c13955eecb0fb4872359e)

Author SHA1 Message Date
Andrew Dunham 74693793be net/netcheck, tailcfg: track whether OS supports IPv6
We had previously added this to the netcheck report in #5087 but never
copied it into the NetInfo struct. Additionally, add it to log lines so
it's visible to support.

Change-Id: Ib6266f7c6aeb2eb2a28922aeafd950fe1bf5627e
Signed-off-by: Andrew Dunham <andrew@tailscale.com>
2 years ago
Maisem Ali 74637f2c15 wgengine/router: [linux] add before deleting interface addrs
Deleting may temporarily result in no addrs on the interface, which results in
all other rules (like routes) to get dropped by the OS.

I verified this fixes the problem.

Signed-off-by: Maisem Ali <maisem@tailscale.com>
2 years ago
phirework d13c9cdfb4
wgengine/magicsock: set up pathfinder (#5994)
Sets up new file for separate silent disco goroutine, tentatively named
pathfinder for now.

Updates #540

Co-authored-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Signed-off-by: Jenny Zhang <jz@tailscale.com>
2 years ago
Brad Fitzpatrick deac82231c wgengine/magicsock: add start of alternate send path
During development of silent disco (#540), an alternate send policy
for magicsock that doesn't wake up the radio frequently with
heartbeats, we want the old & new policies to coexist, like we did
previously pre- and post-disco.

We started to do that earlier in 5c42990c2f but only set up the
env+control knob plumbing to set a bool about which path should be
used.

This starts to add a way for the silent disco code to update the send
path from a separate goroutine. (Part of the effort is going to
de-state-machinify the event based soup that is the current disco
code and make it more Go synchronous style.)

So far this does nothing. (It does add an atomic load on each send
but that should be noise in the grand scheme of things, and a even more
rare atomic store of nil on node config changes.)

Baby steps.

Updates #540

Co-authored-by: Jenny Zhang <jz@tailscale.com>
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2 years ago
Joe Tsai 14100c0985
wgengine/magicsock: restore allocation-free endpoint.DstToString (#5971)
The wireguard-go code unfortunately calls this unconditionally
even when verbose logging is disabled.

Partial revert of #5911.

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
2 years ago
Joe Tsai 9ee3df02ee
wgengine/magicsock: remove endpoint.wgEndpoint (#5911)
This field seems seldom used and the documentation is wrong.
It is simpler to just derive its original value dynamically
when endpoint.DstToString is called.

This method is potentially used by wireguard-go,
but not in any code path is performance sensitive.
All calls to it use it in conjunction with fmt.Printf,
which is going to be slow anyways since it uses Go reflection.

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
2 years ago
Maisem Ali 3555a49518 net/dns: always attempt to read the OS config on macOS/iOS
Also reconfigure DNS on iOS/macOS on link changes.

Signed-off-by: Maisem Ali <maisem@tailscale.com>
2 years ago
James Tucker 539c073cf0 wgengine/magicsock: set UDP socket buffer sizes to 7MB
- At high data rates more buffer space is required in order to avoid
  packet loss during any cause of delay.
- On slower machines more buffer space is required in order to avoid
  packet loss while decryption & tun writing is underway.
- On higher latency network paths more buffer space is required in order
  to overcome BDP.
- On Linux set with SO_*BUFFORCE to bypass net.core.{r,w}mem_max.
- 7MB is the current default maximum on macOS 12.6
- Windows test is omitted, as Windows does not support getsockopt for
  these options.

Signed-off-by: James Tucker <james@tailscale.com>
2 years ago
James Tucker 4ec6d41682 wgengine/router: fix MTU configuration on Windows
Always set the MTU to the Tailscale default MTU. In practice we are
missing applying an MTU for IPv6 on Windows prior to this patch.

This is the simplest patch to fix the problem, the code in here needs
some more refactoring.

Fixes #5914

Signed-off-by: James Tucker <james@tailscale.com>
2 years ago
Joe Tsai a1a43ed266
wgengine/netlog: add support for magicsock statistics (#5913)
This sets up Logger to handle statistics at the magicsock layer,
where we can correlate traffic between a particular tailscale IP address
and any number of physical endpoints used to contact the node
that hosts that tailscale address.

We also export Message and TupleCounts to better document the JSON format
that is being sent to the logging infrastructure.

This commit does NOT yet enable the actual logging of magicsock statistics.
That will be a future commit.

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
2 years ago
Joe Tsai f9120eee57
wgengine: start network logger in Userspace.Reconfig (#5908)
If the wgcfg.Config is specified with network logging arguments,
then Userspace.Reconfig starts up an asynchronous network logger,
which is shutdown either upon Userspace.Close or when Userspace.Reconfig
is called again without network logging or route arguments.

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
2 years ago
Joe Tsai 49bae7fd5c
wgengine: fix typo in Engine.PeerForIP (#5912)
Signed-off-by: Joe Tsai <joetsai@digital-static.net>
2 years ago
Joe Tsai 1b4e4cc1e8
wgengine/netlog: new package for traffic flow logging (#5864)
The Logger type managers a logtail.Logger for extracting
statistics from a tstun.Wrapper.
So long as Shutdown is called, it ensures that logtail
and statistic gathering resources are properly cleared up.

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
2 years ago
Emmanuel T Odeke 680f8d9793 all: fix more resource leaks found by staticmajor
Updates #5706

Signed-off-by: Emmanuel T Odeke <emmanuel@orijtech.com>
2 years ago
Joe Tsai 82f5f438e0
wgengine/wgcfg: plumb down audit log IDs (#5855)
The node and domain audit log IDs are provided in the map response,
but are ultimately going to be used in wgengine since
that's the layer that manages the tstun.Wrapper.

Do the plumbing work to get this field passed down the stack.

Signed-off-by: Joe Tsai <joetsai@digital-static.net>
2 years ago
Brad Fitzpatrick 1841d0bf98 wgengine/magicsock: make debug-level stuff not logged by default
And add a CLI/localapi and c2n mechanism to enable it for a fixed
amount of time.

Updates #1548

Change-Id: I71674aaf959a9c6761ff33bbf4a417ffd42195a7
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2 years ago
Andrew Dunham e5636997c5
wgengine: don't re-allocate trimmedNodes map (#5825)
Change-Id: I512945b662ba952c47309d3bf8a1b243e05a4736
Signed-off-by: Andrew Dunham <andrew@tailscale.com>
2 years ago
Mihai Parparita 8343b243e7 all: consistently initialize Logf when creating tsdial.Dialers
Most visible when using tsnet.Server, but could have resulted in dropped
messages in a few other places too.

Fixes #5743

Signed-off-by: Mihai Parparita <mihai@tailscale.com>
2 years ago
Josh Soref d4811f11a0 all: fix spelling mistakes
Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>
2 years ago
Andrew Dunham 420d841292
wgengine: log subnet router decision at v1 if we have a BIRD client (#5786)
Updates tailscale/coral#82

Change-Id: I398d75f7e178ff7c531ca09899c82cf974fc30c9
Signed-off-by: Andrew Dunham <andrew@tailscale.com>
2 years ago
Tom DNetto ab591906c8 wgengine/router: Increase range of rule priorities when detecting mwan3
Context: https://github.com/tailscale/tailscale/pull/5588#issuecomment-1260655929

It seems that if the interface at index 1 is down, the rule is not installed. As such,
we increase the range we detect up to 2004 in the hope that at least one of the interfaces
1-4 will be up.

Signed-off-by: Tom DNetto <tom@tailscale.com>
2 years ago
Emmanuel T Odeke f981b1d9da all: fix resource leaks with missing .Close() calls
Fixes #5706

Signed-off-by: Emmanuel T Odeke <emmanuel@orijtech.com>
2 years ago
Kyle Carberry 91794f6498 wgengine/magicsock: move firstDerp check after nil derpMap check
This fixes a race condition which caused `c.muCond.Broadcast()` to
never fire in the `firstDerp` if block. It resulted in `Close()`
hanging forever.

Signed-off-by: Kyle Carberry <kyle@carberry.com>
2 years ago
Andrew Dunham 0607832397
wgengine/netstack: always respond to 4via6 echo requests (#5712)
As the comment in the code says, netstack should always respond to ICMP
echo requests to a 4via6 address, even if the netstack instance isn't
normally processing subnet traffic.

Follow-up to #5709

Change-Id: I504d0776c5824071b2a2e0e687bc33e24f6c4746
Signed-off-by: Andrew Dunham <andrew@tailscale.com>
2 years ago
Andrew Dunham b9b0bf65a0
wgengine/netstack: handle 4via6 packets when pinging (#5709)
Change-Id: Ib6ebbaa11219fb91b550ed7fc6ede61f83262e89
Signed-off-by: Andrew Dunham <andrew@tailscale.com>
2 years ago
Brad Fitzpatrick 832031d54b wgengine/magicsock: fix recently introduced data race
From 5c42990c2f, not yet released in a stable build.
Caught by existing tests.

Fixes #5685

Change-Id: Ia76bb328809d9644e8b96910767facf627830600
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2 years ago
phirework 5c42990c2f
wgengine/magicsock: add client flag and envknob to disable heartbeat (#5638)
Baby steps towards turning off heartbeat pings entirely as per #540.
This doesn't change any current magicsock functionality and requires additional
changes to send/disco paths before the flag can be turned on.

Updates #540

Change-Id: Idc9a72748e74145b068d67e6dd4a4ffe3932efd0
Signed-off-by: Jenny Zhang <jz@tailscale.com>

Signed-off-by: Jenny Zhang <jz@tailscale.com>
2 years ago
Eng Zer Jun f0347e841f refactor: move from io/ioutil to io and os packages
The io/ioutil package has been deprecated as of Go 1.16 [1]. This commit
replaces the existing io/ioutil functions with their new definitions in
io and os packages.

Reference: https://golang.org/doc/go1.16#ioutil
Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
2 years ago
Brad Fitzpatrick 74674b110d envknob: support changing envknobs post-init
Updates #5114

Change-Id: Ia423fc7486e1b3f3180a26308278be0086fae49b
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2 years ago
Brad Fitzpatrick 33ee2c058e wgengine: update comments, remove redundant code in forceFullWireguardConfig
Change-Id: I464a0bce36e3a362c7d7ace0e8d2dd77fa825ee2
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2 years ago
Tom DNetto f6da2220d3 wgengine: set fwmark masks in netfilter & ip rules
This change masks the bitspace used when setting and querying the fwmark on packets. This allows
tailscaled to play nicer with other networking software on the host, assuming the other networking
software is also using fwmarks & a different mask.

IPTables / mark module has always supported masks, so this is safe on the netfilter front.

However, busybox only gained support for parsing + setting masks in 1.33.0, so we make sure we
arent such a version before we add the "/<mask>" syntax to an ip rule command.

Signed-off-by: Tom DNetto <tom@tailscale.com>
2 years ago
David Anderson 7c49db02a2 wgengine/magicsock: don't use BPF receive when SO_MARK doesn't work.
Fixes #5607

Signed-off-by: David Anderson <danderson@tailscale.com>
2 years ago
Tom DNetto ed2b8b3e1d wgengine/router: reduce routing rule priority for openWRT + mwan3
Fixes #3659

Signed-off-by: Tom DNetto <tom@tailscale.com>
Co-authored-by: Ian Foster <ian@vorsk.com>
2 years ago
Colin Adler 9c8bbc7888 wgengine/magicsock: fix panic in http debug server
Fixes an panic in `(*magicsock.Conn).ServeHTTPDebug` when the
`recentPongs` ring buffer for an endpoint wraps around.

Signed-off-by: Colin Adler <colin1adler@gmail.com>
2 years ago
Andrew Dunham 9240f5c1e2
wgengine/netstack: only accept connection after dialing (#5503)
If we accept a forwarded TCP connection before dialing, we can
erroneously signal to a client that we support IPv6 (or IPv4) without
that actually being possible. Instead, we only complete the client's TCP
handshake after we've dialed the outbound connection; if that fails, we
respond with a RST.

Updates #5425 (maybe fixes!)

Signed-off-by: Andrew Dunham <andrew@tailscale.com>
2 years ago
James Tucker 672c2c8de8 wgengine/magicsock: add filter to ignore disco to old/other ports
Incoming disco packets are now dropped unless they match one of the
current bound ports, or have a zero port*.

The BPF filter passes all packets with a disco header to the raw packet
sockets regardless of destination port (in order to avoid needing to
reconfigure BPF on rebind).

If a BPF enabled node has just rebound, due to restart or rebind, it may
receive and reply to disco ping packets destined for ports other than
those which are presently bound. If the pong is accepted, the pinging
node will now assume that it can send WireGuard traffic to the pinged
port - such traffic will not reach the node as it is not destined for a
bound port.

*The zero port is ignored, if received. This is a speculative defense
and would indicate a problem in the receive path, or the BPF filter.
This condition is allowed to pass as it may enable traffic to flow,
however it will also enable problems with the same symptoms this patch
otherwise fixes.

Fixes #5536

Signed-off-by: James Tucker <james@tailscale.com>
2 years ago
James Tucker be140add75 wgengine/magicsock: fix regression in initial bind for js
1f959edeb0 introduced a regression for JS
where the initial bind no longer occurred at all for JS.

The condition is moved deeper in the call tree to avoid proliferation of
higher level conditions.

Updates #5537

Signed-off-by: James Tucker <james@tailscale.com>
2 years ago
James Tucker 1f959edeb0 wgengine/magicksock: remove nullability of RebindingUDPConns
Both RebindingUDPConns now always exist. the initial bind (which now
just calls rebind) now ensures that bind is called for both, such that
they both at least contain a blockForeverConn. Calling code no longer
needs to assert their state.

Signed-off-by: James Tucker <james@tailscale.com>
2 years ago
Brad Fitzpatrick 56f6fe204b go.mod, wgengine/wgint: bump wireguard-go
For b51010ba13

Change-Id: Ibf767dfad98aef7e9f0505d91c0d26f924e046d5
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2 years ago
James Tucker 265b008e49 wgengine: fix race on endpoints in getStatus
Signed-off-by: James Tucker <james@tailscale.com>
2 years ago
Brad Fitzpatrick e470893ba0 wgengine/magicsock: use mak in another spot
Change-Id: I0a46d6243371ae6d126005a2bd63820cb2d1db6b
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2 years ago
Andrew Dunham c72caa6672 wgengine/magicsock: use AF_PACKET socket + BPF to read disco messages
This is entirely optional (i.e. failing in this code is non-fatal) and
only enabled on Linux for now. Additionally, this new behaviour can be
disabled by setting the TS_DEBUG_DISABLE_AF_PACKET environment variable.

Updates #3824
Replaces #5474

Co-authored-by: Andrew Dunham <andrew@du.nham.ca>
Signed-off-by: David Anderson <danderson@tailscale.com>
2 years ago
Brad Fitzpatrick 9bd9f37d29 go.mod: bump wireguard/windows, which moves to using net/netip
Updates #5162

Change-Id: If99a3f0000bce0c01bdf44da1d513f236fd7cdf8
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2 years ago
Andrew Dunham e945d87d76
util/uniq: use generics instead of reflect (#5491)
This takes 75% less time per operation per some benchmarks on my mac.

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
2 years ago
James Tucker 90dc0e1702 wgengine: remove unused singleflight group
Signed-off-by: James Tucker <james@tailscale.com>
2 years ago
Andrew Dunham d6c3588ed3
wgengine/wgcfg: only write peer headers if necessary (#5449)
On sufficiently large tailnets, even writing the peer header (~95 bytes)
can result in a large amount of data that needs to be serialized and
deserialized. Only write headers for peers that need to have their
configuration changed.

Signed-off-by: Andrew Dunham <andrew@tailscale.com>
2 years ago
James Tucker 81dba3738e wgengine: remove all peer status from open timeout diagnostics
Avoid contention from fetching status for all peers, and instead fetch
status for a single peer.

Updates tailscale/coral#72
Signed-off-by: James Tucker <james@tailscale.com>
2 years ago
James Tucker ad1cc6cff9 wgengine: use Go API rather than UAPI for status
Signed-off-by: James Tucker <james@tailscale.com>
2 years ago
Brad Fitzpatrick 08b3f5f070 wgengine/wgint: add shady temporary package to get at wireguard internals
For #5451

Change-Id: I43482289e323ba9142a446d551ab7a94a467c43a
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2 years ago
Andrew Dunham 9b77ac128a
wgengine: print in-flight operations on watchdog trigger (#5447)
In addition to printing goroutine stacks, explicitly track all in-flight
operations and print them when the watchdog triggers (along with the
time they were started at). This should make debugging watchdog failures
easier, since we can look at the longest-running operation(s) first.

Signed-off-by: Andrew Dunham <andrew@tailscale.com>

Signed-off-by: Andrew Dunham <andrew@tailscale.com>
2 years ago