FD.io VPP  v21.06
Vector Packet Processing
vxlan_packet.h
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1 /*
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:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
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.
14  */
15 #ifndef __included_vxlan_packet_h__
16 #define __included_vxlan_packet_h__ 1
17 
18 /*
19  * From RFC-7348
20  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
21  * |R|R|R|R|I|R|R|R| Reserved |
22  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
23  * | VXLAN Network Identifier (VNI) | Reserved |
24  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
25  *
26  * VXLAN Header: This is an 8-byte field that has:
27  *
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
31  * ignored on receipt.
32  *
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
37  * other.
38  *
39  * - Reserved fields (24 bits and 8 bits): MUST be set to zero on
40  * transmission and ignored on receipt.
41  *
42  */
43 
44 typedef struct
45 {
52 
53 #define VXLAN_FLAGS_I 0x08
54 
55 static inline u32
57 {
58  u32 vni_reserved_host_byte_order;
59 
60  vni_reserved_host_byte_order = clib_net_to_host_u32 (h->vni_reserved);
61  return vni_reserved_host_byte_order >> 8;
62 }
63 
64 static inline void
66 {
67  h->vni_reserved = clib_host_to_net_u32 (vni << 8);
68  *(u32 *) h = 0;
69  h->flags = VXLAN_FLAGS_I;
70 }
71 
72 #endif /* __included_vxlan_packet_h__ */
73 
74 /*
75  * fd.io coding-style-patch-verification: ON
76  *
77  * Local Variables:
78  * eval: (c-set-style "gnu")
79  * End:
80  */
u32 vni
Definition: flow_types.api:160
unsigned char u8
Definition: types.h:56
unsigned int u32
Definition: types.h:88
#define VXLAN_FLAGS_I
Definition: vxlan_packet.h:53
static u32 vnet_get_vni(vxlan_header_t *h)
Definition: vxlan_packet.h:56
static void vnet_set_vni_and_flags(vxlan_header_t *h, u32 vni)
Definition: vxlan_packet.h:65