LXR linux/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
  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