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#ifndef included_vnet_gre_packet_h
#define included_vnet_gre_packet_h
/*
* GRE packet format
*
* Copyright (c) 2012 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.
*/
#define foreach_gre_protocol \
_ (0x0800, ip4) \
_ (0x86DD, ip6) \
_ (0x6558, teb) \
_ (0x0806, arp) \
_ (0x8847, mpls_unicast) \
_ (0x894F, nsh)
typedef enum {
#define _(n,f) GRE_PROTOCOL_##f = n,
foreach_gre_protocol
#undef _
} gre_protocol_t;
typedef struct {
/* flags and version */
u16 flags_and_version;
/* unimplemented at the moment */
#define GRE_FLAGS_CHECKSUM (1 << 15)
/* deprecated, according to rfc2784 */
#define GRE_FLAGS_ROUTING (1 << 14)
#define GRE_FLAGS_KEY (1 << 13)
#define GRE_FLAGS_SEQUENCE (1 << 12)
#define GRE_FLAGS_STRICT_SOURCE_ROUTE (1 << 11)
/* version 1 is PPTP which we don't support */
#define GRE_SUPPORTED_VERSION 0
#define GRE_VERSION_MASK 0x7
/* 0x800 for ip4, etc. */
u16 protocol;
} gre_header_t;
#endif /* included_vnet_gre_packet_h */
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