X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Fgre%2Fpacket.h;h=bbd67d565c553c89ad424d4c7d389ef56cb43186;hb=dc8d35036f1d06193035ff4b6f161f2c1c17c35a;hp=cc2ccda9effa3e6c0e188daef073cc59f135497c;hpb=7cd468a3d7dee7d6c92f69a0bb7061ae208ec727;p=vpp.git

diff --git a/src/vnet/gre/packet.h b/src/vnet/gre/packet.h
index cc2ccda9eff..bbd67d565c5 100644
--- a/src/vnet/gre/packet.h
+++ b/src/vnet/gre/packet.h
@@ -24,15 +24,18 @@ _ (0x86DD, ip6)                                 \
 _ (0x6558, teb)                                 \
 _ (0x0806, arp)					\
 _ (0x8847, mpls_unicast)			\
+_ (0x88BE, erspan)				\
 _ (0x894F, nsh)
 
-typedef enum {
+typedef enum
+{
 #define _(n,f) GRE_PROTOCOL_##f = n,
   foreach_gre_protocol
 #undef _
 } gre_protocol_t;
 
-typedef struct {
+typedef struct
+{
   /* flags and version */
   u16 flags_and_version;
   /* unimplemented at the moment */
@@ -52,4 +55,120 @@ typedef struct {
   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* */
+
+/* u64 template for ERSPAN type 2 header with both EN bits set */
+#define ERSPAN_HDR2 0x1000180000000000ul
+
 #endif /* included_vnet_gre_packet_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */