xref: /openbmc/linux/include/net/mpls.h (revision f5c27da4)
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