That's exactly how I figured it out, I didn't know the answer either,
but constantly I'm doing simple searches for people and learning the
code for other people it seems even when I really don't even have
the time to do so :-/

Apologies, I did not pay attention to my grep output and was under the 
impression that ->flags is only used together with the TCP headers and that 
the ip->tos assignment was never used.

Thanks,
tavi