[Bug 206012] jail(8): Cannot assign link-local IPv6 address to a jail

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206012

            Bug ID: 206012
           Summary: jail(8): Cannot assign link-local IPv6 address to a
                    jail
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: feld at FreeBSD.org

When attempting to assign a link-local IP to a jail one of the following things
happens:

* it either does not work at all and the jail refuses to start for some reason
claiming the jail does not exist

* Jail starts, but ifconfig in the jail shows there is no IP on the interfaces.
Trying to bind to it with nc(1) to test fails.

* Adding the index to the IPv6 address causes the jail to reject the address as
invalid and not start:

jail: v6test: ip6.addr: not an IPv6 address: fe80::216:3eff:fe72:eadd%xn0

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