why skb->nh.iph->id does not work in sch_generic.c ?????

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Hi

please tell me what is the problem in calling skb->nh.iph->id from inside
qdisc_restart() in sch_generic.c??????
I want to identify packet that is dequeued.


from here:

77 int qdisc_restart(struct net_device *dev)
78 {
79         struct Qdisc *q = dev->qdisc;
80         struct sk_buff *skb;
81
82         /* Dequeue packet */
83         if ((skb = q->dequeue(q)) != NULL) {
84                 if (spin_trylock(&dev->xmit_lock)) {
85                         /* Remember that the driver is grabbed by us. */
86                         dev->xmit_lock_owner = smp_processor_id();
>>>>>>>>>>>>>>>>>>         printk("packet id: %d", skb->nh.iph->id);
<<<<<<<<<<<<<<<<<<<<

During compilation i get: "dereferencing pointer to incomplete type"

regards

adam

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