[Bug 227243] getaddrinfo(3): IPv4-only jail on IPv4+6 host gets ipv6 inaddr_any

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227243

            Bug ID: 227243
           Summary: getaddrinfo(3): IPv4-only jail on IPv4+6 host gets
                    ipv6 inaddr_any
           Product: Base System
           Version: 11.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: phk at FreeBSD.org

On 11.1-RELEASE-p4 amd64.

The host has both IPv4 and IPv6 addresses configured.

The jail has only an IPv4 address configured.

getaddrinfo(3) with a NULL argument an AI_PASSIVE returns IPv6 address ("::")
which cannot used to establish a listen socket because there are no IPv6
addresses in the jail.

As far as I can tell, this happens because IPv6 is before IPv4 in afdl[] and
explore_null() is not smart enough to spot it is in an IPv4-only jail.

I'm not sure if this should be fixed in getaddrinfo.c or in the kernel (to make
socket(2) fail in IPv6 in IPv4 only jails).

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