[Bug 199136] [if_tap] Added down_on_close sysctl variable to tap(4)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199136

yuri at rawbw.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #155152|0                           |1
        is obsolete|                            |

--- Comment #2 from yuri at rawbw.com ---
Created attachment 155174
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=155174&action=edit
patch

I went through several iterations, and updating the patch.

The meaning of IFF_DRV_RUNNING isn't clear in the tap driver, and its value is
currently inconsistent. If the interface goes down when device is open,
tapclose doesn't reset IFF_DRV_RUNNING. But I didn't touch it with this patch.

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