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1 | #ifndef __LINUX_ERSPAN_H |
2 | #define __LINUX_ERSPAN_H | |
3 | ||
4 | /* | |
5 | * GRE header for ERSPAN encapsulation (8 octets [34:41]) -- 8 bytes | |
6 | * 0 1 2 3 | |
7 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
8 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
9 | * |0|0|0|1|0|00000|000000000|00000| Protocol Type for ERSPAN | | |
10 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
11 | * | Sequence Number (increments per packet per session) | | |
12 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
13 | * | |
14 | * Note that in the above GRE header [RFC1701] out of the C, R, K, S, | |
15 | * s, Recur, Flags, Version fields only S (bit 03) is set to 1. The | |
16 | * other fields are set to zero, so only a sequence number follows. | |
17 | * | |
18 | * ERSPAN Type II header (8 octets [42:49]) | |
19 | * 0 1 2 3 | |
20 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 | |
21 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
22 | * | Ver | VLAN | COS | En|T| Session ID | | |
23 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
24 | * | Reserved | Index | | |
25 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | |
26 | * | |
27 | * GRE proto ERSPAN type II = 0x88BE, type III = 0x22EB | |
28 | */ | |
29 | ||
30 | #define ERSPAN_VERSION 0x1 | |
31 | ||
32 | #define VER_MASK 0xf000 | |
33 | #define VLAN_MASK 0x0fff | |
34 | #define COS_MASK 0xe000 | |
35 | #define EN_MASK 0x1800 | |
36 | #define T_MASK 0x0400 | |
37 | #define ID_MASK 0x03ff | |
38 | #define INDEX_MASK 0xfffff | |
39 | ||
40 | enum erspan_encap_type { | |
41 | ERSPAN_ENCAP_NOVLAN = 0x0, /* originally without VLAN tag */ | |
42 | ERSPAN_ENCAP_ISL = 0x1, /* originally ISL encapsulated */ | |
43 | ERSPAN_ENCAP_8021Q = 0x2, /* originally 802.1Q encapsulated */ | |
44 | ERSPAN_ENCAP_INFRAME = 0x3, /* VLAN tag perserved in frame */ | |
45 | }; | |
46 | ||
47 | struct erspan_metadata { | |
48 | __be32 index; /* type II */ | |
49 | }; | |
50 | ||
51 | struct erspanhdr { | |
52 | __be16 ver_vlan; | |
53 | #define VER_OFFSET 12 | |
54 | __be16 session_id; | |
55 | #define COS_OFFSET 13 | |
56 | #define EN_OFFSET 11 | |
57 | #define T_OFFSET 10 | |
58 | struct erspan_metadata md; | |
59 | }; | |
60 | ||
61 | #endif |