Trying to make this code work; but some how it is entering the if condition mentioned below.sock_buff is still a NULL Pointer.I can see that Function was registered with the Ipv4 Hooks. Any ideas/scenarios where the sock_buff remains as NULL Pointer??? Testing this code by trying to do ssh with this machine.
Any Help is really appreciated !!
#########
static struct nf_hook_ops netfilter_ops;
struct sk_buff *sock_buff;
unsigned int main_hook(unsigned int hooknum,struct sk_buff **skb,const struct net_device *in,const struct net_device *out,int (*okfn)(struct sk_buff*)) {
sock_buff = *skb;
if(!sock_buff){
printk(KERN_ERR "Entered unexpected loop \n");
return NF_ACCEPT;
}/* Check for sk_buff NULL */
}
int init_module()
{
netfilter_ops.hook = (nf_hookfn *) main_hook;
netfilter_ops.hooknum = NF_INET_PRE_ROUTING;
netfilter_ops.pf = PF_INET;
netfilter_ops.priority = NF_IP_PRI_FIRST;
nf_register_hook(&netfilter_ops);
}
######################
-Thnx,
VKS
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