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Vector Packet Processing
packet.h
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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 _ (0x0806, arp) \
25 _ (0x8847, mpls_unicast) \
26 _ (0x894F, nsh)
27 
28 typedef enum {
29 #define _(n,f) GRE_PROTOCOL_##f = n,
31 #undef _
33 
34 typedef struct {
35  /* flags and version */
37  /* unimplemented at the moment */
38 #define GRE_FLAGS_CHECKSUM (1 << 15)
39 
40  /* deprecated, according to rfc2784 */
41 #define GRE_FLAGS_ROUTING (1 << 14)
42 #define GRE_FLAGS_KEY (1 << 13)
43 #define GRE_FLAGS_SEQUENCE (1 << 12)
44 #define GRE_FLAGS_STRICT_SOURCE_ROUTE (1 << 11)
45 
46  /* version 1 is PPTP which we don't support */
47 #define GRE_SUPPORTED_VERSION 0
48 #define GRE_VERSION_MASK 0x7
49 
50  /* 0x800 for ip4, etc. */
52 } gre_header_t;
53 
54 #endif /* included_vnet_gre_packet_h */
#define foreach_gre_protocol
Definition: packet.h:21
u16 flags_and_version
Definition: packet.h:36
u16 protocol
Definition: packet.h:51
gre_protocol_t
Definition: packet.h:28
unsigned short u16
Definition: types.h:57