1 files changed, 69 insertions, 0 deletions
diff --git a/src/vnet/vxlan/vxlan_packet.h b/src/vnet/vxlan/vxlan_packet.h
new file mode 100644
index 00000000000..5f93a36fd8f
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+++ b/src/vnet/vxlan/vxlan_packet.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2015 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef __included_vxlan_packet_h__
+#define __included_vxlan_packet_h__ 1
+
+/* 
+ * From RFC-7384
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |R|R|R|R|I|R|R|R|            Reserved                           |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |                VXLAN Network Identifier (VNI) |   Reserved    |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * 
+ * VXLAN Header:  This is an 8-byte field that has:
+ * 
+ * - Flags (8 bits): where the I flag MUST be set to 1 for a valid
+ * VXLAN Network ID (VNI).  The other 7 bits (designated "R") are
+ * reserved fields and MUST be set to zero on transmission and
+ * ignored on receipt.
+ * 
+ * - VXLAN Segment ID/VXLAN Network Identifier (VNI): this is a
+ * 24-bit value used to designate the individual VXLAN overlay
+ * network on which the communicating VMs are situated.  VMs in
+ * different VXLAN overlay networks cannot communicate with each
+ * other.
+ * 
+ * - Reserved fields (24 bits and 8 bits): MUST be set to zero on
+ * transmission and ignored on receipt.
+ * 
+ */
+
+typedef struct {
+  u8 flags;
+  u8 res1;
+  u8 res2;
+  u8 res3;
+  u32 vni_reserved;
+} vxlan_header_t;
+
+#define VXLAN_FLAGS_I 0x08
+
+static inline u32 vnet_get_vni (vxlan_header_t * h)
+{
+  u32 vni_reserved_host_byte_order;
+
+  vni_reserved_host_byte_order = clib_net_to_host_u32 (h->vni_reserved);
+  return vni_reserved_host_byte_order >> 8;
+}
+
+static inline void vnet_set_vni_and_flags (vxlan_header_t * h, u32 vni)
+{
+  h->vni_reserved = clib_host_to_net_u32 (vni<<8);
+  * (u32 *) h = 0;
+  h->flags = VXLAN_FLAGS_I;
+}
+
+#endif /* __included_vxlan_packet_h__ */