Netlink problem

[Nhan Thanh Le <ltnhan@xxxxxxxxxx>]

Hi All,

  I am new babie kernel programming. I am create kernel module use 
netlink to communicate to user space program. And the code is shown 
bellow. When I debug: the result of netlink_kernel_create is not null, 
but when i debug by printk out all the attribute is zero.
   And, My user space program try to connect my kernel then my computer 
was hang, debug by printing out the sk->receive_queue.qlen is a nagative 
number ex: -797845. Could someone help me to solve this probelem, thank 
you very much and appreciate for help.



struct sock *g_mntr_sock

g_mntr_sock=netlink_kernel_create(NETLINK_MONITOR,rc_input);;


    if ( g_mntr_sock != NULL)
    {
      printk("Create socket netlink successfull \n");
      printk("daddr %i, rcv_saddr %i, dport %i, local port %i 
\n",g_mntr_sock->daddr,g_mntr_sock->rcv_saddr,g_mntr_sock->dport,g_mntr_sock->num);
      printk("state %i, sport %i, family %i, rcvbuf %i 
\n",g_mntr_sock->state,g_mntr_sock->sport,g_mntr_sock->family,g_mntr_sock->rcvbuf);
      return 0;
    }
    return -1;

void rc_input(void){
printk("Number length %i \n",sk->receive_queue.qlen);

while((skb=skb_dequeue(&sk->receive_queue)) != NULL)
  {
    mntr_rcv_skb(skb);
    nlh = (struct nlmsghdr *)skb->data;
    //printk("%s: message received: %s n",__FUNCTION__,NLMSG_DATA(nlh));
    send_to_user(skb);
    //kfree_skb(skb);
  }
}

Thanks
Nhanle


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