FD.io VPP  v17.04-9-g99c0734
Vector Packet Processing
packet.h
Go to the documentation of this file.
1 #ifndef included_vnet_gre_packet_h
2 #define included_vnet_gre_packet_h
3 
4 /*
5  * GRE packet format
6  *
7  * Copyright (c) 2012 Cisco and/or its affiliates.
8  * Licensed under the Apache License, Version 2.0 (the "License");
9  * you may not use this file except in compliance with the License.
10  * You may obtain a copy of the License at:
11  *
12  * http://www.apache.org/licenses/LICENSE-2.0
13  *
14  * Unless required by applicable law or agreed to in writing, software
15  * distributed under the License is distributed on an "AS IS" BASIS,
16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17  * See the License for the specific language governing permissions and
18  * limitations under the License.
19  */
20 
21 #define foreach_gre_protocol \
22 _ (0x0800, ip4) \
23 _ (0x86DD, ip6) \
24 _ (0x6558, teb) \
25 _ (0x0806, arp) \
26 _ (0x8847, mpls_unicast) \
27 _ (0x894F, nsh)
28 
29 typedef enum {
30 #define _(n,f) GRE_PROTOCOL_##f = n,
32 #undef _
34 
35 typedef struct {
36  /* flags and version */
38  /* unimplemented at the moment */
39 #define GRE_FLAGS_CHECKSUM (1 << 15)
40 
41  /* deprecated, according to rfc2784 */
42 #define GRE_FLAGS_ROUTING (1 << 14)
43 #define GRE_FLAGS_KEY (1 << 13)
44 #define GRE_FLAGS_SEQUENCE (1 << 12)
45 #define GRE_FLAGS_STRICT_SOURCE_ROUTE (1 << 11)
46 
47  /* version 1 is PPTP which we don't support */
48 #define GRE_SUPPORTED_VERSION 0
49 #define GRE_VERSION_MASK 0x7
50 
51  /* 0x800 for ip4, etc. */
53 } gre_header_t;
54 
55 #endif /* included_vnet_gre_packet_h */
#define foreach_gre_protocol
Definition: packet.h:21
u16 flags_and_version
Definition: packet.h:37
u16 protocol
Definition: packet.h:52
gre_protocol_t
Definition: packet.h:29
unsigned short u16
Definition: types.h:57