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
15struct mpls_shim_hdr {
16 __be32 label_stack_entry;
17};
18
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
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
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