Std.Ip.unmap

fn

unmap: &Std.Ip.Address -> Std.Ip.Address

The IPv4 address an IPv4-mapped IPv6 address carries, and any other address unchanged.

A dual-stack listener reports an IPv4 peer as ::ffff:a.b.c.d. Asking an IPv4 rule about that value without unmapping it first answers no, and a deny rule that answers no is an open door.

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