LXR linux/include/net/mpls.h

   1/*
   2 * Copyright (c) 2014 Nicira, Inc.
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of version 2 of the GNU General Public
   6 * License as published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful, but
   9 * WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11 * General Public License for more details.
  12 */
  13
  14#ifndef _NET_MPLS_H
  15#define _NET_MPLS_H 1
  16
  17#include <linux/if_ether.h>
  18#include <linux/netdevice.h>
  19
  20#define MPLS_HLEN 4
  21
  22static inline bool eth_p_mpls(__be16 eth_type)
  23{
  24        return eth_type == htons(ETH_P_MPLS_UC) ||
  25                eth_type == htons(ETH_P_MPLS_MC);
  26}
  27
  28/*
  29 * For non-MPLS skbs this will correspond to the network header.
  30 * For MPLS skbs it will be before the network_header as the MPLS
  31 * label stack lies between the end of the mac header and the network
  32 * header. That is, for MPLS skbs the end of the mac header
  33 * is the top of the MPLS label stack.
  34 */
  35static inline unsigned char *skb_mpls_header(struct sk_buff *skb)
  36{
  37        return skb_mac_header(skb) + skb->mac_len;
  38}
  39#endif
  40