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
  22 static 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  */
  35 static inline unsigned char *skb_mpls_header(struct sk_buff *skb)
  36 {
  37         return skb_mac_header(skb) + skb->mac_len;
  38 }
  39 #endif