netdev - accessing TCP port numbers of an skb in a qdisc

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Date:	Wed, 11 Apr 2007 00:33:45 -0400
From:	"Ritesh Kumar" <ritesh@...unc.edu>
To:	netdev@...r.kernel.org
Subject: accessing TCP port numbers of an skb in a qdisc

Hi,
    For some per-flow queue management work I need to access TCP port
numbers of an skb inside a qdisc (i.e. in qdisc enqueue and dequeue
functions). Can I assume that skb->data always points to the head of
the IP header of the packet? If that is the case will the following
statements do the trick?

if(skb->nh.iph->protocol == IPPROTO_TCP) {
    skb->h.raw = skb->data + (skb->nh.iph->ihl*4);
    /* read the tcp port numbers in
     * skb->h.th->source and skb->h.th->dest
     */
}

Thanks a lot for your help!

Ritesh
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