_ (0x6558, teb) \
_ (0x0806, arp) \
_ (0x8847, mpls_unicast) \
+_ (0x88BE, erspan) \
_ (0x894F, nsh)
typedef enum
u16 protocol;
} gre_header_t;
+/* From draft-foschiano-erspan-03.txt
+
+ Different frame variants known as "ERSPAN Types" can be
+ distinguished based on the GRE "Protocol Type" field value: Type I
+ and II's value is 0x88BE while Type III's is 0x22EB [ETYPES].
+
+ GRE header for ERSPAN Type II encapsulation (8 octets [34:41])
+ 0 1 2 3
+ 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
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ |0|0|0|1|0|00000|000000000|00000| Protocol Type for ERSPAN |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Sequence Number (increments per packet per session) |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ Note that in the above GRE header [RFC1701] out of the C, R, K, S,
+ s, Recur, Flags, Version fields only S (bit 03) may be set to 1. The
+ other fields are always set to zero.
+
+ ERSPAN Type II's frame format also adds a special 8-octet ERSPAN
+ "feature" header on top of the MAC/IPv4/GRE headers to enclose the
+ raw mirrored frames.
+
+ The ERSPAN Type II feature header is described below:
+
+ ERSPAN Type II header (8 octets [42:49])
+ 0 1 2 3
+ 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
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Ver | VLAN | COS | En|T| Session ID |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ | Reserved | Index |
+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+ The various fields of the above header are described in this table:
+
+ Field Position Length Definition
+ [octet:bit] (bits)
+
+ Ver [42:0] 4 ERSPAN Encapsulation version.
+ This indicates the version of
+ the ERSPAN encapsulation
+ specification. Set to 0x1 for
+ Type II.
+
+ VLAN [42:4] 12 Original VLAN of the frame,
+ mirrored from the source.
+ If the En field is set to 11,
+ the value of VLAN is undefined.
+
+ COS [44:0] 3 Original class of service of the
+ frame, mirrored from the source.
+
+ En [44:3] 2 The trunk encapsulation type
+ associated with the ERSPAN source
+ port for ingress ERSPAN traffic.
+
+ The possible values are:
+ 00-originally without VLAN tag
+ 01-originally ISL encapsulated
+ 10-originally 802.1Q encapsulated
+ 11-VLAN tag preserved in frame.
+
+ T [44:5] 1 This bit indicates that the frame
+ copy encapsulated in the ERSPAN
+ packet has been truncated. This
+ occurs if the ERSPAN encapsulated
+ frame exceeds the configured MTU.
+
+ Session ID [44:6] 10 Identification associated with
+ (ERSPAN ID) each ERSPAN session. Must be
+ unique between the source and the
+ receiver(s). (See section below.)
+
+ Reserved [46:0] 12 All bits are set to zero
+
+ Index [47:4] 20 A 20 bit index/port number
+ associated with the ERSPAN
+ traffic's port and
+ direction (ingress/egress). N.B.:
+ This field is platform dependent.
+*/
+
+/* *INDENT-OFF* */
+typedef CLIB_PACKED (struct {
+ u32 seq_num;
+ union
+ {
+ struct
+ {
+ u16 ver_vlan;
+ u16 cos_en_t_session;
+ u32 res_index;
+ } t2;
+ u64 t2_u64;
+ };
+}) erspan_t2_t;
+
+typedef CLIB_PACKED (struct {
+ gre_header_t gre;
+ erspan_t2_t erspan;
+}) erspan_t2_header_t;
+
+/* *INDENT-ON* */
+
#endif /* included_vnet_gre_packet_h */
/*
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