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 40