From: Octavian Purdila <redacted>
Date: Fri, 30 May 2008 23:53:56 +0300

tcp_v4_rcv says: TCP_SKB_CB(skb)->flags = iph->tos;

I am probably missing something obvious, but shouldn't flags be initialized 
with the TCP headers instead of the IP TOS value?

On packet output ->flags holds the TCP header flags, on packet input
it holds the TOS field for testing ECN flags.

You could have had a look at how the ->flags field is used on TCP
output vs. TCP input processing to get a better idea of what might be
going on here.

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 :-/