/*
   * Copyright (c) 2014 Nicira, Inc.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of version 2 of the GNU General Public
   * License as published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   * General Public License for more details.
   */
  
  #ifndef _NET_MPLS_H
  #define _NET_MPLS_H 1
  
  #include <linux/if_ether.h>
  #include <linux/netdevice.h>
  
  #define MPLS_HLEN 4

  struct mpls_shim_hdr {
  	__be32 label_stack_entry;
  };

  static inline bool eth_p_mpls(__be16 eth_type)
  {
  	return eth_type == htons(ETH_P_MPLS_UC) ||
  		eth_type == htons(ETH_P_MPLS_MC);
  }

  static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb)
  {
  	return (struct mpls_shim_hdr *)skb_network_header(skb);
  }

  #endif