include/net/mpls.h

   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