LXR linux/include/net/mpls.h

   1/*
   2 * Copyright (c) 2014 Nicira, Inc.
   3 *
   4 * This program is free software; you can redistribute it and/or
   5 * modify it under the terms of version 2 of the GNU General Public
   6 * License as published by the Free Software Foundation.
   7 *
   8 * This program is distributed in the hope that it will be useful, but
   9 * WITHOUT ANY WARRANTY; without even the implied warranty of
  10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  11 * General Public License for more details.
  12 */
  13
  14#ifndef _NET_MPLS_H
  15#define _NET_MPLS_H 1
  16
  17#include <linux/if_ether.h>
  18#include <linux/netdevice.h>
  19#include <linux/mpls.h>
  20
  21#define MPLS_HLEN 4
  22
  23struct mpls_shim_hdr {
  24        __be32 label_stack_entry;
  25};
  26
  27static inline bool eth_p_mpls(__be16 eth_type)
  28{
  29        return eth_type == htons(ETH_P_MPLS_UC) ||
  30                eth_type == htons(ETH_P_MPLS_MC);
  31}
  32
  33static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb)
  34{
  35        return (struct mpls_shim_hdr *)skb_network_header(skb);
  36}
  37
  38static inline struct mpls_shim_hdr mpls_entry_encode(u32 label,
  39                                                     unsigned int ttl,
  40                                                     unsigned int tc,
  41                                                     bool bos)
  42{
  43        struct mpls_shim_hdr result;
  44
  45        result.label_stack_entry =
  46                cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) |
  47                            (tc << MPLS_LS_TC_SHIFT) |
  48                            (bos ? (1 << MPLS_LS_S_SHIFT) : 0) |
  49                            (ttl << MPLS_LS_TTL_SHIFT));
  50        return result;
  51}
  52
  53#endif
  54