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
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
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
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
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.