net/netmon: Use OpenVPN interface on Mac #16654
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If we are on a machine where OpenVPN has brought an interface up we want to explicitly use it by preference to identifying the system's idea of the default route. We identify OpenVPN by the combination of a utunN device being present, and it having routes 0.0.0.0/1 and 128.0.0.0/1, being the two `def1` half routes that the OpenVPN client installs on Macs. This allows Tailscale to reach the internet and then function as an overlay network. Closes tailscale#16652 Signed-off-by: Andrew Cowie <andrew.cowie@apkudo.com>
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If we are on a machine where OpenVPN has brought an interface up we want to explicitly use it by preference to Tailscale identifying the system's idea of the default route.
We identify OpenVPN by the combination of a utunN device being present, and it having routes 0.0.0.0/1 and 128.0.0.0/1, being the two
def1half routes that the OpenVPN client installs on Macs. This allows Tailscale to reach the internet in a situation where the OpenVPN interface is the only actual viable pathway to the outside, so that Tailscale can then function as an overlay network as intended.Closes #16652