We basically already had the RIB-parsing Go code for this in both
net/interfaces and wgengine/monitor, for other reasons.
Fixes#1426Fixes#1471
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This change makes it impossible to set your own IP address as the exit node for this system.
Fixes#1489
Signed-off-by: Christine Dodrill <xe@tailscale.com>
So a region can be used if needed, but won't be STUN-probed or used as
its home.
This gives us another possible debugging mechanism for #1310, or can
be used as a short-term measure against DERP flip-flops for people
equidistant between regions if our hysteresis still isn't good enough.
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
IP forwarding is not required when advertising a machine's local IPs
over Tailscale.
Fixes#1435.
Signed-off-by: David Anderson <danderson@tailscale.com>
This reverts commit 08949d4ef1.
I think this code was aspirational. There's no code that sets up the
appropriate NAT code using pfctl/etc. See #911 and #1475.
Updates #1475
Updates #911
No server support yet, but we want Tailscale 1.6 clients to be able to respond
to them when the server can do it.
Updates #1310
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
There was a logical race where Conn.Rebind could acquire the
RebindingUDPConn mutex, close the connection, fail to rebind, release
the mutex, and then because the mutex was no longer held, ReceiveIPv4
wouldn't retry reads that failed with net.ErrClosed, letting that
error back to wireguard-go, which would then stop running that receive
IP goroutine.
Instead, keep the RebindingUDPConn mutex held for the entirety of the
replacement in all cases.
Updates tailscale/corp#1289
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
interfaces.State.String tries to print a concise summary of the
network state, removing any interfaces that don't have any or any
interesting IP addresses. On macOS and iOS, for instance, there are a
ton of misc things.
But the link monitor based its are-there-changes decision on
interfaces.State.Equal, which just used reflect.DeepEqual, including
comparing all the boring interfaces. On macOS, when turning wifi on or off, there
are a ton of misc boring interface changes, resulting in hitting an earlier
check I'd added on suspicion this was happening:
[unexpected] network state changed, but stringification didn't
This fixes that by instead adding a new
interfaces.State.RemoveUninterestingInterfacesAndAddresses method that
does, uh, that. Then use that in the monitor. So then when Equal is
used later, it's DeepEqualing the already-cleaned version with only
interesting interfaces.
This makes cmd/tailscaled debug --monitor much less noisy.
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Windows was only running the localapi on the debug port which was a
stopgap at the time while doing peercreds work. Removed that, and
wired it up correctly, with some more docs.
More clean-up to do after 1.6, moving the localhost TCP auth code into
the peercreds package. But that's too much for now, so the docs will
have to suffice, even if it's at a bit of an awkward stage with the
newly-renamed "NotWindows" field, which still isn't named well, but
it's better than its old name of "Unknown" which hasn't been accurate
since unix sock peercreds work anyway.
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
So the control server can test whether a client's actually present.
Most clients are over HTTP/2, so these pings (to the same host) are
super cheap.
This mimics the earlier goroutine dump mechanism.
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Previously the CLI could only find the HTTP auth token when running
the CLI outside the sandbox, not like
/Applications/Tailscale.app/Contents/MacOS/Tailscale when that was
from the App Store.
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
The debub subcommand was moved in
6254efb9ef because the monitor brought
in tons of dependencies to the cmd/tailscale binary, but there wasn't
any need to remove the whole subcommand itself.
Add it back, with a tool to dump the local daemon's goroutines.
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Not beautiful, but I'm debugging connectivity problems on
NEProvider.sleep+wake and need more clues.
Updates #1426
Updates tailscale/corp#1289
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
