When retrying, if count is not 0, we forget to dequeue another request,
and so the ring fills up and errors out.
Reported-by: Sascha Dierberg <[email protected]>
Signed-off-by: Jason A. Donenfeld <[email protected]>
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 <[email protected]>
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 <[email protected]>
Signed-off-by: Jason A. Donenfeld <[email protected]>
If we receive a large UDP packet, don't return an error to receive.go,
which then terminates the receive loop. Instead, simply retry.
Considering Winsock's general finickiness, we might consider other
places where an attacker on the wire can generate error conditions like
this.
Reported-by: Sascha Dierberg <[email protected]>
Signed-off-by: Jason A. Donenfeld <[email protected]>
When we pass the TUN FD to the child, we have to call TUNSIFPID;
otherwise when we close the device, we get a splat in dmesg.
Signed-off-by: Jason A. Donenfeld <[email protected]>
By not comparing these with the modulo, the ring became nearly never
full, resulting in completion queue buffers filling up prematurely.
Reported-by: Joshua Sjoding <[email protected]>
Signed-off-by: Jason A. Donenfeld <[email protected]>
There's no way for len(peers)==0 when a current peer has
isRunning==false.
This requires some struct reshuffling so that the uint64 pointer is
aligned.
Signed-off-by: Jason A. Donenfeld <[email protected]>
Googlers have a habit of graffiting their name in TODO items that then
are never addressed, and other people won't go near those because
they're marked territory of another animal. I've been gradually cleaning
these up as I see them, but this commit just goes all the way and
removes the remaining stragglers.
Signed-off-by: Jason A. Donenfeld <[email protected]>
This code is stable, and the test is finicky, especially on high core
count systems, so just disable it.
Signed-off-by: Jason A. Donenfeld <[email protected]>
This linked list implementation is awful, but maybe Go 2 will help
eventually, and at least we're not open coding the hlist any more.
Signed-off-by: Jason A. Donenfeld <[email protected]>
We're loosing our ownership of the port when bringing the device down,
which means another test process could reclaim it. Avoid this by
retrying for 4 seconds.
Signed-off-by: Jason A. Donenfeld <[email protected]>
Rather than racing with Start(), since we're never destroying these
queues, we just set the variables at creation time.
Signed-off-by: Jason A. Donenfeld <[email protected]>
Since RoutineHandshake calls peer.SendKeepalive(), it potentially is a
writer into the encryption queue, so we need to bump the wg count.
Signed-off-by: Jason A. Donenfeld <[email protected]>
It's never used and we won't have a use for it. Also, move to go-running
stringer, for those without GOPATHs.
Signed-off-by: Jason A. Donenfeld <[email protected]>
The test previously checked the offset within a substruct, not the
offset within the allocated struct, so this adds the two together.
It then fixes an alignment crash on 32-bit machines.
Signed-off-by: Jason A. Donenfeld <[email protected]>
Part of being actually idempotent is that we shouldn't penalize code
that takes advantage of this property with a log splat.
Signed-off-by: Jason A. Donenfeld <[email protected]>
Before, the code attached a finalizer to an object that wasn't returned,
resulting in immediate garbage collection. Instead return the actual
pointer.
Signed-off-by: Jason A. Donenfeld <[email protected]>
Without this, we wind up freeing packets that the encryption/decryption
queues still have, resulting in a UaF.
Signed-off-by: Jason A. Donenfeld <[email protected]>
Here is the old implementation:
type WaitPool struct {
c chan interface{}
}
func NewWaitPool(max uint32, new func() interface{}) *WaitPool {
p := &WaitPool{c: make(chan interface{}, max)}
for i := uint32(0); i < max; i++ {
p.c <- new()
}
return p
}
func (p *WaitPool) Get() interface{} {
return <- p.c
}
func (p *WaitPool) Put(x interface{}) {
p.c <- x
}
It performs worse than the new one:
name old time/op new time/op delta
WaitPool-16 16.4µs ± 5% 15.1µs ± 3% -7.86% (p=0.008 n=5+5)
Signed-off-by: Jason A. Donenfeld <[email protected]>
benchmark old ns/op new ns/op delta
BenchmarkUAPIGet-16 2872 2157 -24.90%
benchmark old allocs new allocs delta
BenchmarkUAPIGet-16 30 18 -40.00%
benchmark old bytes new bytes delta
BenchmarkUAPIGet-16 737 256 -65.26%
Signed-off-by: Jason A. Donenfeld <[email protected]>
This moves to a simple queue with no routine processing it, to reduce
scheduler pressure.
This splits latency in half!
benchmark old ns/op new ns/op delta
BenchmarkThroughput-16 2394 2364 -1.25%
BenchmarkLatency-16 259652 120810 -53.47%
Signed-off-by: Jason A. Donenfeld <[email protected]>
This makes the IpcGet method much faster.
We also refactor the traversal API to use a callback so that we don't
need to allocate at all. Avoiding allocations we do self-masking on
insertion, which in turn means that split intermediate nodes require a
copy of the bits.
benchmark old ns/op new ns/op delta
BenchmarkUAPIGet-16 3243 2659 -18.01%
benchmark old allocs new allocs delta
BenchmarkUAPIGet-16 35 30 -14.29%
benchmark old bytes new bytes delta
BenchmarkUAPIGet-16 1218 737 -39.49%
This benchmark is good, though it's only for a pair of peers, each with
only one allowedips. As this grows, the delta expands considerably.
Signed-off-by: Jason A. Donenfeld <[email protected]>
There are very few cases, if any, in which a user only wants one of
these levels, so combine it into a single level.
While we're at it, reduce indirection on the loggers by using an empty
function rather than a nil function pointer. It's not like we have
retpolines anyway, and we were always calling through a function with a
branch prior, so this seems like a net gain.
Signed-off-by: Jason A. Donenfeld <[email protected]>
In order to avoid even the flirtation with passing on these dependencies
to ordinary consumers of wireguard-go, this commit makes a new go.mod
that's entirely separate from the root one.
Signed-off-by: Jason A. Donenfeld <[email protected]>
The Go linker isn't smart enough to prevent gvisor from being pulled
into modules that use other parts of tun/, due to the types exposed. So,
we put this into its own standalone module.
We use this as an opportunity to introduce some example code as well.
I'm still not happy that this not only clutters this repo's go.sum, but
all the other projects that consume it, but it seems like making a new
module inside of this repo will lead to even greater confusion.
Signed-off-by: Jason A. Donenfeld <[email protected]>
Until we depend on Go 1.16 (which isn't released yet), alias our own
variable to the private member of the net package. This will allow an
easy find replace to make this go away when we eventually switch to
1.16.
Signed-off-by: Jason A. Donenfeld <[email protected]>
This allows people to initiate connections over WireGuard without any
underlying operating system support.
I'm not crazy about the trash it adds to go.sum, but the code this
actually adds to the binaries seems contained to the gvisor repo.
For the TCP/IP implementation, it uses gvisor. And it borrows some
internals from the Go standard library's resolver in order to bring Dial
and DialContext to tun_net, along with the LookupHost helper function.
This allows for things like HTTP2-over-TLS to work quite well:
package main
import (
"io"
"log"
"net"
"net/http"
"golang.zx2c4.com/wireguard/device"
"golang.zx2c4.com/wireguard/tun"
)
func main() {
tun, tnet, err := tun.CreateNetTUN([]net.IP{net.ParseIP("192.168.4.29")}, []net.IP{net.ParseIP("8.8.8.8"), net.ParseIP("8.8.4.4")}, 1420)
if err != nil {
log.Panic(err)
}
dev := device.NewDevice(tun, &device.Logger{log.Default(), log.Default(), log.Default()})
dev.IpcSet(`private_key=a8dac1d8a70a751f0f699fb14ba1cff7b79cf4fbd8f09f44c6e6a90d0369604f
public_key=25123c5dcd3328ff645e4f2a3fce0d754400d3887a0cb7c56f0267e20fbf3c5b
endpoint=163.172.161.0:12912
allowed_ip=0.0.0.0/0
`)
dev.Up()
client := http.Client{
Transport: &http.Transport{
DialContext: tnet.DialContext,
},
}
resp, err := client.Get("https://www.zx2c4.com/ip")
if err != nil {
log.Panic(err)
}
body, err := io.ReadAll(resp.Body)
if err != nil {
log.Panic(err)
}
log.Println(string(body))
}
Signed-off-by: Jason A. Donenfeld <[email protected]>
Jason A. Donenfeld