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Hi!
I register a hook with hooknum NF_IP_PRE_ROUTING, and in the
hook function
I find out (*skb)->mac.ethernet is
equal to (*skb)->nh.iph.
Is it a bug?
My OS is Redhat Linux 9.0, with kernel version
2.4.20-8.
Below is some piece of my code:
static unsigned int my_nf_hook_input(unsigned int hooknum,
struct sk_buff ** skb, const struct net_device * in, const struct net_device * out, int (* okfn)(struct sk_buff *)) { struct iphdr * ip = (*skb)->nh.iph; struct ethhdr * mac = (*skb)->mac.ethernet; /* fix me: ? */
if((void *)mac == (void*)ip)
{
printk(KERN_INFO "A
bug???\n");
mac = (struct
ethhdr *)((char *)ip - sizeof(struct ethhdr));
}
...
}
Regards!
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