One thing to note. The socket filter proggie is a set of struct-s
wuth 8 and 16 bits values in it. Protobuf doesn't support such thing
and it's too annoying to mess with yet another message for that.
Instead, I encode all this stuff into array of fixed64 fields to
handle endianity (yes, protobuf handles it, but each field is not
just 64-bit value, but a structure).
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>