We'll use SO_BINDTODEVICE instead of fancy policy routing. This has
some limitations: for example, we will route all traffic through the
interface that has the main "default" (0.0.0.0/0) route, so machines
that have multiple physical interfaces might have to go through DERP to
get to some peers. But machines with multiple physical interfaces are
very likely to have policy routing (ip rule) support anyway.
So far, the only OS I know of that needs this feature is ChromeOS
(crostini). Fixes#245.
Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>
tailscale netcheck was broken otherwise.
We can fix this a better way later; I'm just fixing a regression in
some way because I'm trying to work on netcheck at the moment.
This allows tailscaled's own traffic to bypass Tailscale-managed routes,
so that things like tailscale-provided default routes don't break
tailscaled itself.
Progress on #144.
Signed-off-by: David Anderson <danderson@tailscale.com>
