[Bug 277349] The net.inet.ip.source_address_validation should ignore CARP IP in backup state

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277349

--- Comment #6 from Zhenlei Huang <zlei@FreeBSD.org> ---
(In reply to Gleb Smirnoff from comment #1)
> I think we had discussion on this some time ago. I suggested to make the
> BACKUP IP address to be treated as non-local for all purposes except bind(2).
Generally good. And, the bind socket should not accept any incoming connections
even they are locally originated.

> Here is a patch to try. I did not test it, but it gives an idea on what
> am I talking about. It should change more that just source IP address
> validation. The main question is whether there are any scenario that the
> patch would break.

The change seems good if we treat CARP BACKUP IP addresses as NOT **local**.

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