linux-imx

/* packet.h: Rx packet layout and definitions

 *

 * Copyright (C) 2002, 2007 Red Hat, Inc. All Rights Reserved.

 * Written by David Howells (dhowells@redhat.com)

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

 */

​

#ifndef _LINUX_RXRPC_PACKET_H

#define _LINUX_RXRPC_PACKET_H

​

typedef u32 rxrpc_seq_t;    /* Rx message sequence number */

typedef u32 rxrpc_serial_t; /* Rx message serial number */

typedef __be32  rxrpc_seq_net_t; /* on-the-wire Rx message sequence number */

typedef __be32  rxrpc_serial_net_t; /* on-the-wire Rx message serial number */

​

/*****************************************************************************/

/*

 * on-the-wire Rx packet header

 * - all multibyte fields should be in network byte order

 */

struct rxrpc_wire_header {

    __be32      epoch;      /* client boot timestamp */

#define RXRPC_RANDOM_EPOCH  0x80000000  /* Random if set, date-based if not */

​

    __be32      cid;        /* connection and channel ID */

#define RXRPC_MAXCALLS      4           /* max active calls per conn */

#define RXRPC_CHANNELMASK   (RXRPC_MAXCALLS-1)  /* mask for channel ID */

#define RXRPC_CIDMASK       (~RXRPC_CHANNELMASK)    /* mask for connection ID */

#define RXRPC_CIDSHIFT      ilog2(RXRPC_MAXCALLS)   /* shift for connection ID */

#define RXRPC_CID_INC       (1 << RXRPC_CIDSHIFT)   /* connection ID increment */

​

    __be32      callNumber; /* call ID (0 for connection-level packets) */

    __be32      seq;        /* sequence number of pkt in call stream */

    __be32      serial;     /* serial number of pkt sent to network */

​

    uint8_t     type;       /* packet type */

#define RXRPC_PACKET_TYPE_DATA      1   /* data */

#define RXRPC_PACKET_TYPE_ACK       2   /* ACK */

#define RXRPC_PACKET_TYPE_BUSY      3   /* call reject */

#define RXRPC_PACKET_TYPE_ABORT     4   /* call/connection abort */

#define RXRPC_PACKET_TYPE_ACKALL    5   /* ACK all outstanding packets on call */

#define RXRPC_PACKET_TYPE_CHALLENGE 6   /* connection security challenge (SRVR->CLNT) */

#define RXRPC_PACKET_TYPE_RESPONSE  7   /* connection secutity response (CLNT->SRVR) */

#define RXRPC_PACKET_TYPE_DEBUG     8   /* debug info request */

#define RXRPC_PACKET_TYPE_PARAMS    9   /* Parameter negotiation (unspec'd, ignore) */

#define RXRPC_PACKET_TYPE_10        10  /* Ignored */

#define RXRPC_PACKET_TYPE_11        11  /* Ignored */

#define RXRPC_PACKET_TYPE_VERSION   13  /* version string request */

​

    uint8_t     flags;      /* packet flags */

#define RXRPC_CLIENT_INITIATED  0x01        /* signifies a packet generated by a client */

#define RXRPC_REQUEST_ACK   0x02        /* request an unconditional ACK of this packet */

#define RXRPC_LAST_PACKET   0x04        /* the last packet from this side for this call */

#define RXRPC_MORE_PACKETS  0x08        /* more packets to come */

#define RXRPC_JUMBO_PACKET  0x20        /* [DATA] this is a jumbo packet */

#define RXRPC_SLOW_START_OK 0x20        /* [ACK] slow start supported */

​

    uint8_t     userStatus; /* app-layer defined status */

#define RXRPC_USERSTATUS_SERVICE_UPGRADE 0x01   /* AuriStor service upgrade request */