1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (c) 2014 Nicira, Inc. 4 */ 5 6 #ifndef _NET_MPLS_H 7 #define _NET_MPLS_H 1 8 9 #include <linux/if_ether.h> 10 #include <linux/netdevice.h> 11 #include <linux/mpls.h> 12 13 #define MPLS_HLEN 4 14 15 struct mpls_shim_hdr { 16 __be32 label_stack_entry; 17 }; 18 eth_p_mpls(__be16 eth_type)19static inline bool eth_p_mpls(__be16 eth_type) 20 { 21 return eth_type == htons(ETH_P_MPLS_UC) || 22 eth_type == htons(ETH_P_MPLS_MC); 23 } 24 mpls_hdr(const struct sk_buff * skb)25static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb) 26 { 27 return (struct mpls_shim_hdr *)skb_network_header(skb); 28 } 29 mpls_entry_encode(u32 label,unsigned int ttl,unsigned int tc,bool bos)30static inline struct mpls_shim_hdr mpls_entry_encode(u32 label, 31 unsigned int ttl, 32 unsigned int tc, 33 bool bos) 34 { 35 struct mpls_shim_hdr result; 36 37 result.label_stack_entry = 38 cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) | 39 (tc << MPLS_LS_TC_SHIFT) | 40 (bos ? (1 << MPLS_LS_S_SHIFT) : 0) | 41 (ttl << MPLS_LS_TTL_SHIFT)); 42 return result; 43 } 44 45 #endif 46