Support for odd netmasks?

There is a Fedora user request for proper support of odd netmasks in IP
acls: https://bugzilla.redhat.com/show_bug.cgi?id=470709

Quote from Fedora bug report:

        Any valid network mask should be usable, especially as there
        appears to be an increasing tendency for very large corporations
        to deliberately choose odd IP address combinations in an effort
        to frustrate people who legitimately wish to secure their
        computers.

Which is counter to our plan or removing support for "odd" netmasks.

Any comments or suggestions?

The bug report as such is about things failing silently when odd
netmasks is used.

My suggestion is that we continue supporting odd netmasks, but move
these to a linked list, parallell to the splay tree, giving the IP
mathes a dual personality of both splay tree and linked list based on
the type of element added.

Regards
Henrik