[PATCH 4/4] ws2_32: Selectively bind UDP sockets to interfaces while still allowing broadcast packets (try 4).

[Erich E. Hoover]

Real Name:
    Erich Hoover

Description:
    Ok, back again for Bug #7929.  I really wanted to avoid having to
learn how to do Linux Socket Filters/Berkeley Packet Filters, but this
is really my last thought about how to solve this bug without somehow
convincing the network subsystem maintainer to reverse his ruling.
For reference, a kinder version of his rejection of modifying the
kernel to support this feature is here:
http://www.mail-archive.com/linux-net@vger.kernel.org/msg01306.html
    Anyway, this solution involves two components: it registers a
Linux Socket Filter on the socket to screen out incoming packets not
destined for the given interface, and it uses an IP_PKTINFO control
message header to suggest the outgoing interface for packets on the
socket (builds on patch 3).  This solution requires no additional
administrative privileges, and I believe it should address the
concerns expressed for using IP_PKTINFO to perform both the incoming
and the outgoing filtering.

Changelog:
    ws2_32: Selectively bind UDP sockets to interfaces while still
allowing broadcast packets.
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