[Bug 275765] Automatically add carp(4) interfaces to interface group "carp"

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275765

Kristof Provost <kp@freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kp@freebsd.org

--- Comment #1 from Kristof Provost <kp@freebsd.org> ---
vlan and bridge interfaces are automagically added to their respective groups
because they're cloned interfaces. (See ifc_link_ifp() in sys/net/if_clone.c).

There's no such thing as a carp interface. There are carp addresses on other
interfaces, but it'd be surprising for a new address to cause an interface to
be added to an interface group.

It may be possible to emulate this in userspace using the CARP notifications in
devd. 

I'm not convinced that it'd be a good idea to try to do this from the kernel,
but for those who want to try, ifc_link_ifp() and carp_alloc()/carp_destroy()
are the places to start looking,

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