Use the RTMGRP_IPV4_ROUTE const from x/sys/unix instead of using the
corresponding RTNLGRP_IPV4_ROUTE const to create the multicast groups
mask.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Peers are currently removed after Device's goroutines are signaled to stop,
but without waiting for them to actually do so, which is racy.
For example, RoutineHandshake may be in Peer.SendKeepalive
when the corresponding peer is removed, which closes its nonce channel.
This causes a send on a closed channel, as observed in tailscale/tailscale#487.
This patch seems to be the correct synchronizing action:
Peer's goroutines are receivers and handle channel closure gracefully,
so Device's goroutines are the ones that should be fully stopped first.
Signed-Off-By: Dmytro Shynkevych <dmytro@tailscale.com>
In the presence of preemption, the current test may fail transiently.
This uses static test data instead to ensure consistent behavior.
Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>
Cleans up and splits out UAPIOpen to its own file.
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
[zx2c4: changed const to var for socketDirectory]
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Go's GC semantics might not always guarantee the safety of this, and the
race detector gets upset too, so instead we wrap this all in atomic
accessors.
Reported-by: David Anderson <danderson@tailscale.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
c85e4a410f introduced preliminary HWID
checking to speed up Wintun adapter enumeration. However, all HWID are
case insensitive by Windows convention.
Furthermore, a device might have multiple HWIDs. When DevInfo's
DeviceRegistryProperty(SPDRP_HARDWAREID) method returns []string, all
strings returned should be checked against given hardware ID.
This issue was discovered when researching Wintun and wireguard-go on
Windows 10 ARM64. The Wintun adapter was created using devcon.exe
utility with "wintun" hardware ID, causing wireguard-go fail to
enumerate the adapter properly.
Signed-off-by: Simon Rozman <simon@rozman.si>
It was just returning "no such file or directory" (the String of the
syscall.Errno returned by CreateTUN).
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This works around a startup race condition when competing with
HackListener, which is trying to do the same job. If HackListener
detects that the tundev is running while there is still an event in the
netlink queue that says it isn't running, then the device receives a
string of events like
EventUp (HackListener)
EventDown (NetlinkListener)
EventUp (NetlinkListener)
Unfortunately, after the first EventDown, the device stops itself,
thinking incorrectly that the administrator has downed its tundev.
The device is ignoring the initial EventDown anyway, so just don't emit
it.
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
The sticky socket code stays in the device package for now,
as it reaches deeply into the peer list.
This is the first step in an effort to split some code out of
the very busy device package.
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
Adds a test that will fail consistently on 32-bit platforms if the
struct ever changes again to violate the rules. This is likely not
needed because unaligned access crashes reliably, but this will reliably
fail even if tests accidentally pass due to lucky alignment.
Signed-Off-By: David Anderson <danderson@tailscale.com>
This lets us include the package on those platforms in a
followup commit where we split out a conn package from device.
It also lets us run `go test ./...` when developing on macOS.
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
The existing test would occasionally flake out with:
--- FAIL: TestRatelimiter (0.12s)
ratelimiter_test.go:99: Test failed for 127.0.0.1 , on: 7 ( not having refilled enough ) expected: false got: true
FAIL
FAIL golang.zx2c4.com/wireguard/ratelimiter 0.171s
The fake clock also means the tests run much faster, so
testing this package with -count=1000 now takes < 100ms.
While here, several style cleanups. The most significant one
is unembeding the sync.Mutex fields in the rate limiter objects.
Embedded as they were, the lock methods were accessible
outside the ratelimiter package. As they aren't needed externally,
keep them internal to make them easier to reason about.
Passes `go test -race -count=10000 ./ratelimiter`
Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
Update the golang.org/x/sys/unix dependency and use the newly introduced
RTMGRP_* consts instead of using the corresponding RTNLGRP_* const to
create a mask.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
