Netfilter problem

[Kirill Ratkin]

Hi.

I've a strange error when I try to check protocol type
in netfilter hook function. 

I see this message:
kping.c: In function `knet_hook':
kping.c:116: dereferencing pointer to incomplete type
make: *** [kping.o] Error 1

This is part of my code:
static
unsigned int knet_hook(unsigned int hooknum,
                      struct sk_buff** p_skb,
                      const struct net_device* p_in,
                      const struct net_device* p_out,
                      int (*okfn)(struct sk_buff* ))
{
  ...
  if((*p_skb)->nh.iph->protocol==
	(unsigned char)IPPROTO_ICMP)
  {
    printk("<1>ICMP Packet killed\n");
    return NF_DROP;
  }
  ...
}

It had compiled on 2.4.1 version.

I don't understand why ... .

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