[Bug 138678] [lo] FreeBSD does not assign linklocal address to loopbacks >0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=138678

Andrey V. Elsukov <ae at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |ae at FreeBSD.org

--- Comment #3 from Andrey V. Elsukov <ae at FreeBSD.org> ---
Created attachment 189363
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=189363&action=edit
Proposed patch

in6_ifattach fails to add IPv6 loopback address to loopback interface due to it
already exists on lo0 and then just exits before LLA should be assigned.
This patch changes the behavior, it checks for IPv6 loopback address existence
in the whole system, not only on given interface. And if loopback address is
already configured, it doesn't try assign it again.

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