/* The "unknown" protocol.  This is what is used for protocols we
   * don't understand.  It's returned by ip_ct_find_proto().
   */
  
  /* (C) 1999-2001 Paul `Rusty' Russell
   * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  
  #include <linux/types.h>
  #include <linux/init.h>
  
  #include <linux/netfilter.h>
  #include <net/netfilter/nf_nat.h>
  #include <net/netfilter/nf_nat_l4proto.h>
  
  static bool unknown_in_range(const struct nf_conntrack_tuple *tuple,
  			     enum nf_nat_manip_type manip_type,
  			     const union nf_conntrack_man_proto *min,
  			     const union nf_conntrack_man_proto *max)
  {
  	return true;
  }
  
  static void unknown_unique_tuple(const struct nf_nat_l3proto *l3proto,
  				 struct nf_conntrack_tuple *tuple,
  				 const struct nf_nat_range *range,
  				 enum nf_nat_manip_type maniptype,
  				 const struct nf_conn *ct)
  {
  	/* Sorry: we can't help you; if it's not unique, we can't frob
  	 * anything.
  	 */
  	return;
  }
  
  static bool
  unknown_manip_pkt(struct sk_buff *skb,
  		  const struct nf_nat_l3proto *l3proto,
  		  unsigned int iphdroff, unsigned int hdroff,
  		  const struct nf_conntrack_tuple *tuple,
  		  enum nf_nat_manip_type maniptype)
  {
  	return true;
  }
  
  const struct nf_nat_l4proto nf_nat_l4proto_unknown = {
  	.manip_pkt		= unknown_manip_pkt,
  	.in_range		= unknown_in_range,
  	.unique_tuple		= unknown_unique_tuple,
  };