2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
15 #ifndef __included_vxlan_packet_h__
16 #define __included_vxlan_packet_h__ 1
20 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
21 * |R|R|R|R|I|R|R|R| Reserved |
22 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
23 * | VXLAN Network Identifier (VNI) | Reserved |
24 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
26 * VXLAN Header: This is an 8-byte field that has:
28 * - Flags (8 bits): where the I flag MUST be set to 1 for a valid
29 * VXLAN Network ID (VNI). The other 7 bits (designated "R") are
30 * reserved fields and MUST be set to zero on transmission and
33 * - VXLAN Segment ID/VXLAN Network Identifier (VNI): this is a
34 * 24-bit value used to designate the individual VXLAN overlay
35 * network on which the communicating VMs are situated. VMs in
36 * different VXLAN overlay networks cannot communicate with each
39 * - Reserved fields (24 bits and 8 bits): MUST be set to zero on
40 * transmission and ignored on receipt.
52 #define VXLAN_FLAGS_I 0x08
54 static inline u32 vnet_get_vni (vxlan_header_t * h)
56 u32 vni_reserved_host_byte_order;
58 vni_reserved_host_byte_order = clib_net_to_host_u32 (h->vni_reserved);
59 return vni_reserved_host_byte_order >> 8;
62 static inline void vnet_set_vni_and_flags (vxlan_header_t * h, u32 vni)
64 h->vni_reserved = clib_host_to_net_u32 (vni<<8);
66 h->flags = VXLAN_FLAGS_I;
69 #endif /* __included_vxlan_packet_h__ */