tun/netstack: check error returned by SetDeadline()
Signed-off-by: Alexander Neumann <alexander.neumann@redteam-pentesting.de>
[Jason: don't wrap deadline error.] Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit fixes all callsites of netip.AddrFromSlice(), which has
changed its signature and now returns two values.
Signed-off-by: Alexander Neumann <alexander.neumann@redteam-pentesting.de>
[Jason: remove error handling from AddrFromSlice.] Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Thomas H. Ptacek [Mon, 31 Jan 2022 22:55:36 +0000 (16:55 -0600)]
tun/netstack: implement ICMP ping
Provide a PacketConn interface for netstack's ICMP endpoint; netstack
currently only provides EchoRequest/EchoResponse ICMP support, so this
code exposes only an interface for doing ping.
Signed-off-by: Thomas Ptacek <thomas@sockpuppet.org>
[Jason: rework structure, match std go interfaces, add example code] Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
We missed a function exit point. This was exacerbated by e3134bf
("device: defer state machine transitions until configuration is
complete"), but the bug existed prior. Minus provided the following
useful reproducer script:
#!/usr/bin/env bash
set -eux
make wireguard-go || exit 125
ip netns del test-ns || true
ip netns add test-ns
ip link add test-kernel type wireguard
wg set test-kernel listen-port 0 private-key <(echo "QMCfZcp1KU27kEkpcMCgASEjDnDZDYsfMLHPed7+538=") peer "eDPZJMdfnb8ZcA/VSUnLZvLB2k8HVH12ufCGa7Z7rHI=" allowed-ips 10.51.234.10/32
ip link set test-kernel netns test-ns up
ip -n test-ns addr add 10.51.234.1/24 dev test-kernel
port=$(ip netns exec test-ns wg show test-kernel listen-port)
ip link del test-go || true
./wireguard-go test-go
wg set test-go private-key <(echo "WBM7qimR3vFk1QtWNfH+F4ggy/hmO+5hfIHKxxI4nF4=") peer "+nj9Dkqpl4phsHo2dQliGm5aEiWJJgBtYKbh7XjeNjg=" allowed-ips 0.0.0.0/0 endpoint 127.0.0.1:$port
ip addr add 10.51.234.10/24 dev test-go
ip link set test-go up
ping -c2 -W1 10.51.234.1
Reported-by: minus <minus@mnus.de> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
The deferred RUnlock calls weren't executing until all peers
had been processed. Add an anonymous function so that each
peer may be unlocked as soon as it is completed.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
There are more places where we'll need to add it later, when Go 1.18
comes out with support for it in the "net" package. Also, allowedips
still uses slices internally, which might be suboptimal.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
device: only propagate roaming value before peer is referenced elsewhere
A peer.endpoint never becomes nil after being not-nil, so creation is
the only time we actually need to set this. This prevents a race from
when the variable is actually used elsewhere, and allows us to avoid an
expensive atomic.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Otherwise recent WDK binaries fail on ARM64, where an exception handler
is used for trapping an illegal instruction when ARMv8.1 atomics are
being tested for functionality.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
The reason this was failing before is that dloadsup.h's
DloadObtainSection was doing a linear search of sections to find which
header corresponds with the IMAGE_DELAYLOAD_DESCRIPTOR section, and we
were stupidly overwriting the VirtualSize field, so the linear search
wound up matching the .text section, which then it found to not be
marked writable and failed with FAST_FAIL_DLOAD_PROTECTION_FAILURE.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
device: remove nodes by peer in O(1) instead of O(n)
Now that we have parent pointers hooked up, we can simply go right to
the node and remove it in place, rather than having to recursively walk
the entire trie.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
device: remove recursion from insertion and connect parent pointers
This makes the insertion algorithm a bit more efficient, while also now
taking on the additional task of connecting up parent pointers. This
will be handy in the following commit.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
tun: linux: account for interface removal from outside
On Linux we can run `ip link del wg0`, in which case the fd becomes
stale, and we should exit. Since this is an intentional action, don't
treat it as an error.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
The -1 protection was removed and the wrong error was returned, causing
us to read from a bogus fd. As well, remove the useless closures that
aren't doing anything, since this is all synchronized anyway.
Fixes: 10533c3 ("all: make conn.Bind.Open return a slice of receive functions") Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
In 097af6e ("tun: windows: protect reads from closing") we made sure no
functions are running when End() is called, to avoid a UaF. But we still
need to kick that event somehow, so that Read() is allowed to exit, in
order to release the lock. So this commit calls SetEvent, while moving
the closing boolean to be atomic so it can be modified without locks,
and then moves to a WaitGroup for the RCU-like pattern.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
device: log all errors received by RoutineReceiveIncoming
When debugging, it's useful to know why a receive func exited.
We were already logging that, but only in the "death spiral" case.
Move the logging up, to capture it always.
Reduce the verbosity, since it is not an error case any more.
Put the receive func name in the log line.
The code previously used the old errors channel for checking, rather
than the simpler boolean, which caused issues on shutdown, since the
errors channel was meaningless. However, looking at this exposed a more
basic problem: Close() and all the other functions that check the closed
boolean can race. So protect with a basic RW lock, to ensure that
Close() waits for all pending operations to complete.
Reported-by: Joshua Sjoding <joshua.sjoding@scjalliance.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
device: allocate new buffer in receive death spiral
Note: this bug is "hidden" by avoiding "death spiral" code path by 6228659 ("device: handle broader range of errors in RoutineReceiveIncoming").
If the code reached "death spiral" mechanism, there would be multiple
double frees happening. This results in a deadlock on iOS, because the
pools are fixed size and goroutine might stop until somebody makes
space in the pool.
This was almost 100% repro on the new ARM Macbooks:
- Build with 'ios' tag for Mac. This will enable bounded pools.
- Somehow call device.IpcSet at least couple of times (update config)
- device.BindUpdate() would be triggered
- RoutineReceiveIncoming would enter "death spiral".
- RoutineReceiveIncoming would stall on double free (pool is already
full)
- The stuck routine would deadlock 'device.closeBindLocked()' function
on line 'netc.stopping.Wait()'
Signed-off-by: Kristupas Antanavičius <kristupas.antanavicius@nordsec.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
all: make conn.Bind.Open return a slice of receive functions
Instead of hard-coding exactly two sources from which
to receive packets (an IPv4 source and an IPv6 source),
allow the conn.Bind to specify a set of sources.
Beneficial consequences:
* If there's no IPv6 support on a system,
conn.Bind.Open can choose not to return a receive function for it,
which is simpler than tracking that state in the bind.
This simplification removes existing data races from both
conn.StdNetBind and bindtest.ChannelBind.
* If there are more than two sources on a system,
the conn.Bind no longer needs to add a separate muxing layer.
device: handle broader range of errors in RoutineReceiveIncoming
RoutineReceiveIncoming exits immediately on net.ErrClosed,
but not on other errors. However, for errors that are known
to be permanent, such as syscall.EAFNOSUPPORT,
we may as well exit immediately instead of retrying.
This considerably speeds up the package device tests right now,
because the Bind sometimes (incorrectly) returns syscall.EAFNOSUPPORT
instead of net.ErrClosed.
projects / thirdparty / wireguard-go.git / log
