| 1 |
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| 2 | |
| 3 | * Copyright (c) 2014 Nicira, Inc.
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| 4 |
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| 5 |
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| 6 | #ifndef _NET_MPLS_H
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| 7 | #define _NET_MPLS_H 1
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| 8 |
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| 9 | #include <linux/if_ether.h>
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| 10 | #include <linux/netdevice.h>
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| 11 | #include <linux/mpls.h>
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| 12 |
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| 13 | #define MPLS_HLEN 4
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| 14 |
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| 15 | struct mpls_shim_hdr {
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| 16 | __be32 label_stack_entry;
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| 17 | };
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| 18 |
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| 19 | static inline bool eth_p_mpls(__be16 eth_type)
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| 20 | {
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| 21 | return eth_type == htons(ETH_P_MPLS_UC) ||
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| 22 | eth_type == htons(ETH_P_MPLS_MC);
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| 23 | }
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| 24 |
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| 25 | static inline struct mpls_shim_hdr *mpls_hdr(const struct sk_buff *skb)
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| 26 | {
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| 27 | return (struct mpls_shim_hdr *)skb_network_header(skb);
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| 28 | }
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| 29 |
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| 30 | static inline struct mpls_shim_hdr mpls_entry_encode(u32 label,
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| 31 | unsigned int ttl,
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| 32 | unsigned int tc,
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| 33 | bool bos)
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| 34 | {
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| 35 | struct mpls_shim_hdr result;
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| 36 |
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| 37 | result.label_stack_entry =
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| 38 | cpu_to_be32((label << MPLS_LS_LABEL_SHIFT) |
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| 39 | (tc << MPLS_LS_TC_SHIFT) |
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| 40 | (bos ? (1 << MPLS_LS_S_SHIFT) : 0) |
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| 41 | (ttl << MPLS_LS_TTL_SHIFT));
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| 42 | return result;
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| 43 | }
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| 44 |
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| 45 | #endif
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