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/*
* Copyright (c) 2015, 2016 Cloudbase Solutions Srl
*
* 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.
*/
#ifndef __GRE_H_
#define __GRE_H_ 1
#include "Flow.h"
#include "IpHelper.h"
#include "NetProto.h"
typedef union _OVS_FWD_INFO *POVS_FWD_INFO;
typedef struct _OVS_GRE_VPORT {
UINT64 ipId;
/*
* To be filled
*/
} OVS_GRE_VPORT, *POVS_GRE_VPORT;
/* GRE RFC 2890 header based on http://tools.ietf.org/html/rfc2890
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |C| |K|S| Reserved0 | Ver | Protocol Type |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Checksum (optional) | Reserved1 (Optional) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Key (optional) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Sequence Number (Optional) |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
typedef struct GREHdr {
UINT16 flags;
UINT16 protocolType;
} GREHdr, *PGREHdr;
/* Transparent Ethernet Bridging */
#define GRE_NET_TEB 0x5865
/* GRE Flags*/
#define GRE_CSUM 0x0080
#define GRE_KEY 0x0020
/* The maximum GRE header length that we can process */
#define OVS_MAX_GRE_LGTH (sizeof(EthHdr) + sizeof(IPHdr) + sizeof(GREHdr) + 12)
NTSTATUS OvsInitGreTunnel(POVS_VPORT_ENTRY vport);
VOID OvsCleanupGreTunnel(POVS_VPORT_ENTRY vport);
void OvsCleanupGreTunnel(POVS_VPORT_ENTRY vport);
NDIS_STATUS OvsEncapGre(POVS_VPORT_ENTRY vport,
PNET_BUFFER_LIST curNbl,
OvsIPTunnelKey *tunKey,
POVS_SWITCH_CONTEXT switchContext,
POVS_PACKET_HDR_INFO layers,
PNET_BUFFER_LIST *newNbl,
POVS_FWD_INFO switchFwdInfo);
NDIS_STATUS OvsDecapGre(POVS_SWITCH_CONTEXT switchContext,
PNET_BUFFER_LIST curNbl,
OvsIPTunnelKey *tunKey,
PNET_BUFFER_LIST *newNbl);
static __inline UINT16
OvsTunnelFlagsToGreFlags(UINT16 tunnelflags)
{
UINT16 flags = 0;
if (tunnelflags & OVS_TNL_F_CSUM) {
flags |= GRE_CSUM;
}
if (tunnelflags & OVS_TNL_F_KEY) {
flags |= GRE_KEY;
}
return flags;
}
static __inline UINT32
GreTunHdrSize(UINT16 flags)
{
UINT32 sum = sizeof(EthHdr) + sizeof(IPHdr) + sizeof(GREHdr);
sum += (flags & GRE_CSUM) ? 4 : 0;
sum += (flags & GRE_KEY) ? 4 : 0;
return sum;
}
static __inline UINT32
GreTunHdrSizeFromLayers(UINT16 flags, POVS_PACKET_HDR_INFO layers)
{
UINT32 sum = layers->l4Offset + sizeof(GREHdr);
sum += (flags & GRE_CSUM) ? 4 : 0;
sum += (flags & GRE_KEY) ? 4 : 0;
return sum;
}
static __inline UINT32
GreMaxLengthFromLayers(POVS_PACKET_HDR_INFO layers)
{
return (layers->l4Offset + sizeof(GREHdr) + 12);
}
#endif /*__GRE_H_ */
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