static void print_debug_skb(struct sk_buff *skb){
  enum ip_conntrack_info ctinfo;
  struct nf_conn *ct;
  struct iphdr *iph;
  struct udphdr *udh;
  int sport,dport;
  unsigned int ctmark, opackets, rpackets;
  struct nf_conn_counter *acct = NULL;
  int dir = 0;

  uint8 ipver;
  ct = nf_ct_get( skb, &ctinfo );
  if( ct )
    acct = nf_conn_acct_find(ct);

  iph = ip_hdr(skb);
  if( !iph ){
    printk("IP header missing in print_debug_skb\n");
    return;
  }

  ipver = iph->version;

  if (ipver==4) //(1) //(out)
  {
    sport = dport = 0;
    if( iph->protocol == 6 || iph->protocol == 17 ){
        udh = udp_hdr(skb);
        if( udh ){
            sport = ntohs(udh->source);
            dport = ntohs(udh->dest);
        }
    }

    ctmark = opackets = rpackets = 0;
    if( ct && acct ){
        ctmark = ct->mark;
        opackets = acct[0].packets;
        rpackets = acct[1].packets;
    }

    dir = CTINFO2DIR(ctinfo);
    printk(KERN_INFO "dir=%d src=%08x dst=%08x protocol=%d sport=%d dport=%d fwmark=%d ct=%x,ctmark=%d acct[0]=%llu acct[1]=%llu\n",
            dir, htonl(iph->saddr), htonl(iph->daddr), iph->protocol, sport, dport, skb->mark, ct, ctmark, opackets, rpackets);
  }
}