/*
 * Copyright (c) 2014 VMware, Inc.
 *
 * 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 __VXLAN_H_
#define __VXLAN_H_ 1

#include "IpHelper.h"
#include "NetProto.h"

typedef union _OVS_FWD_INFO *POVS_FWD_INFO;

typedef struct _OVS_VXLAN_VPORT {
    UINT16 dstPort;
    UINT64 filterID;
    UINT64 ipId;
    /*
     * To be filled
     */
} OVS_VXLAN_VPORT, *POVS_VXLAN_VPORT;

/* VXLAN header. */
typedef struct VXLANHdr {
    /* Flags. */
    UINT32   flags1:2;
    /* Packet needs replication to multicast group (used for multicast proxy).
     */
    UINT32   locallyReplicate:1;
    /* Instance ID flag, must be set to 1. */
    UINT32   instanceID:1;
    /* Flags. */
    UINT32   flags2:4;
    /* Reserved. */
    UINT32  reserved1:24;
    /* VXLAN ID. */
    UINT32  vxlanID:24;
    /* Reserved. */
    UINT32   reserved2:8;
} VXLANHdr;

NTSTATUS OvsInitVxlanTunnel(PIRP irp,
                            POVS_VPORT_ENTRY vport,
                            UINT16 udpDestPort,
                            PFNTunnelVportPendingOp callback,
                            PVOID tunnelContext);

NTSTATUS OvsCleanupVxlanTunnel(PIRP irp,
                               POVS_VPORT_ENTRY vport,
                               PFNTunnelVportPendingOp callback,
                               PVOID tunnelContext);

NDIS_STATUS OvsSlowPathDecapVxlan(const PNET_BUFFER_LIST packet,
                                  OvsIPTunnelKey *tunnelKey);

NDIS_STATUS OvsEncapVxlan(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 OvsDecapVxlan(POVS_SWITCH_CONTEXT switchContext,
                          PNET_BUFFER_LIST curNbl,
                          OvsIPTunnelKey *tunKey,
                          PNET_BUFFER_LIST *newNbl);

static __inline UINT32
OvsGetVxlanTunHdrSize(BOOLEAN isIpv4)
{
    /* XXX: Can L2 include VLAN at all? */
    return sizeof(EthHdr) + (isIpv4 ? sizeof(IPHdr) : sizeof(IPv6Hdr)) +
           sizeof (UDPHdr) + sizeof (VXLANHdr);
}

static __inline UINT32
OvsGetVxlanTunHdrSizeFromLayers(POVS_PACKET_HDR_INFO layers)
{
    return layers->l7Offset + sizeof(VXLANHdr);
}

#define VXLAN_UDP_PORT 4789
#define VXLAN_UDP_PORT_NBO 0xB512

#endif /* __VXLAN_H_ */