Viewing file:  mpls.h (943 B) -rw-r--r--
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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (c) 2014 Nicira, Inc.
*/
#ifndef _NET_MPLS_H
#define _NET_MPLS_H 1
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/mpls.h>
#define MPLS_HLEN 4
struct mpls_shim_hdr {
__be32 label_stack_entry;
};
static inline bool eth_p_mpls(__be16 eth_type)
{
return eth_type == htons(ETH_P_MPLS_UC) ||
eth_type == htons(ETH_P_MPLS_MC);
}
static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb)
{
return (struct mpls_shim_hdr *)skb_network_header(skb);
}
static inline struct mpls_shim_hdr mpls_entry_encode(u32 label,
unsigned int ttl,
unsigned int tc,
bool bos)
{
struct mpls_shim_hdr result;
result.label_stack_entry =
cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) |
(tc << MPLS_LS_TC_SHIFT) |
(bos ? (1 << MPLS_LS_S_SHIFT) : 0) |
(ttl << MPLS_LS_TTL_SHIFT));
return result;
}
#endif
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