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)19 static 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)25 static 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)30 static 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