[Bug 1561] Check for up on open tap device

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=1561

--- Comment #1 from Damien Miller <djm at mindrot.org>  ---
Created attachment 1911
  --> https://bugzilla.mindrot.org/attachment.cgi?id=1911
/home/djm/sshd-tun-iff_up.diff

Unified diff format against current

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