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 struct mpls_shim_hdr { 23 __be32 label_stack_entry; 24 }; 25 26 static inline bool eth_p_mpls(__be16 eth_type) 27 { 28 return eth_type == htons(ETH_P_MPLS_UC) || 29 eth_type == htons(ETH_P_MPLS_MC); 30 } 31 32 static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb) 33 { 34 return (struct mpls_shim_hdr *)skb_network_header(skb); 35 } 36 #endif 37