/*
   * RFC 3720 (iSCSI) protocol data types
   *
   * Copyright (C) 2005 Dmitry Yusupov
   * Copyright (C) 2005 Alex Aizman
   * maintained by open-iscsi@googlegroups.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.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   * General Public License for more details.
   *
   * See the file COPYING included with this distribution for more details.
   */
  
  #ifndef ISCSI_PROTO_H
  #define ISCSI_PROTO_H
  
  #include <linux/types.h>
  #include <scsi/scsi.h>
  
  #define ISCSI_DRAFT20_VERSION	0x00
  
  /* default iSCSI listen port for incoming connections */
  #define ISCSI_LISTEN_PORT	3260
  
  /* iSCSI header length */
  #define ISCSI_HDR_LEN		48
  
  /* iSCSI CRC32C length */
  #define ISCSI_CRC_LEN		4
  
  /* Padding word length */
  #define ISCSI_PAD_LEN		4
  
  /*
   * Serial Number Arithmetic, 32 bits, RFC1982
   */
  
  static inline int iscsi_sna_lt(u32 n1, u32 n2)
  {
  	return (s32)(n1 - n2) < 0;
  }
  
  static inline int iscsi_sna_lte(u32 n1, u32 n2)
  {
  	return (s32)(n1 - n2) <= 0;
  }
  
  static inline int iscsi_sna_gt(u32 n1, u32 n2)
  {
  	return (s32)(n1 - n2) > 0;
  }
  
  static inline int iscsi_sna_gte(u32 n1, u32 n2)
  {
  	return (s32)(n1 - n2) >= 0;
  }
  
  /*
   * useful common(control and data pathes) macro
   */
  #define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
  #define hton24(p, v) { \
          p[0] = (((v) >> 16) & 0xFF); \
          p[1] = (((v) >> 8) & 0xFF); \
          p[2] = ((v) & 0xFF); \
  }
  #define zero_data(p) {p[0]=0;p[1]=0;p[2]=0;}
  
  /* initiator tags; opaque for target */
  typedef uint32_t __bitwise__ itt_t;
  /* below makes sense only for initiator that created this tag */
  #define build_itt(itt, age) ((__force itt_t)\
  	((itt) | ((age) << ISCSI_AGE_SHIFT)))
  #define get_itt(itt) ((__force uint32_t)(itt_t)(itt) & ISCSI_ITT_MASK)
  #define RESERVED_ITT ((__force itt_t)0xffffffff)
  
  /*
   * iSCSI Template Message Header
   */
  struct iscsi_hdr {
  	uint8_t		opcode;
  	uint8_t		flags;		/* Final bit */
  	uint8_t		rsvd2[2];
  	uint8_t		hlength;	/* AHSs total length */
  	uint8_t		dlength[3];	/* Data length */
  	struct scsi_lun	lun;
  	itt_t		itt;		/* Initiator Task Tag, opaque for target */
  	__be32		ttt;		/* Target Task Tag */
  	__be32		statsn;
  	__be32		exp_statsn;
  	__be32		max_statsn;
  	uint8_t		other[12];
  };
  
  /************************* RFC 3720 Begin *****************************/
  
  #define ISCSI_RESERVED_TAG		0xffffffff
  
  /* Opcode encoding bits */
  #define ISCSI_OP_RETRY			0x80
  #define ISCSI_OP_IMMEDIATE		0x40
  #define ISCSI_OPCODE_MASK		0x3F
  
  /* Initiator Opcode values */
  #define ISCSI_OP_NOOP_OUT		0x00
  #define ISCSI_OP_SCSI_CMD		0x01
  #define ISCSI_OP_SCSI_TMFUNC		0x02
  #define ISCSI_OP_LOGIN			0x03
  #define ISCSI_OP_TEXT			0x04
  #define ISCSI_OP_SCSI_DATA_OUT		0x05
  #define ISCSI_OP_LOGOUT			0x06
  #define ISCSI_OP_SNACK			0x10
  
  #define ISCSI_OP_VENDOR1_CMD		0x1c
  #define ISCSI_OP_VENDOR2_CMD		0x1d
  #define ISCSI_OP_VENDOR3_CMD		0x1e
  #define ISCSI_OP_VENDOR4_CMD		0x1f
  
  /* Target Opcode values */
  #define ISCSI_OP_NOOP_IN		0x20
  #define ISCSI_OP_SCSI_CMD_RSP		0x21
  #define ISCSI_OP_SCSI_TMFUNC_RSP	0x22
  #define ISCSI_OP_LOGIN_RSP		0x23
  #define ISCSI_OP_TEXT_RSP		0x24
  #define ISCSI_OP_SCSI_DATA_IN		0x25
  #define ISCSI_OP_LOGOUT_RSP		0x26
  #define ISCSI_OP_R2T			0x31
  #define ISCSI_OP_ASYNC_EVENT		0x32
  #define ISCSI_OP_REJECT			0x3f
  
  struct iscsi_ahs_hdr {
  	__be16 ahslength;
  	uint8_t ahstype;
  	uint8_t ahspec[5];
  };
  
  #define ISCSI_AHSTYPE_CDB		1
  #define ISCSI_AHSTYPE_RLENGTH		2
  #define ISCSI_CDB_SIZE			16
  
  /* iSCSI PDU Header */
  struct iscsi_scsi_req {
  	uint8_t opcode;
  	uint8_t flags;
  	__be16 rsvd2;
  	uint8_t hlength;
  	uint8_t dlength[3];
  	struct scsi_lun lun;
  	itt_t	 itt;	/* Initiator Task Tag */
  	__be32 data_length;
  	__be32 cmdsn;
  	__be32 exp_statsn;
  	uint8_t cdb[ISCSI_CDB_SIZE];	/* SCSI Command Block */
  	/* Additional Data (Command Dependent) */
  };
  
  /* Command PDU flags */
  #define ISCSI_FLAG_CMD_FINAL		0x80
  #define ISCSI_FLAG_CMD_READ		0x40
  #define ISCSI_FLAG_CMD_WRITE		0x20
  #define ISCSI_FLAG_CMD_ATTR_MASK	0x07	/* 3 bits */
  
  /* SCSI Command Attribute values */
  #define ISCSI_ATTR_UNTAGGED		0
  #define ISCSI_ATTR_SIMPLE		1
  #define ISCSI_ATTR_ORDERED		2
  #define ISCSI_ATTR_HEAD_OF_QUEUE	3
  #define ISCSI_ATTR_ACA			4
  
  struct iscsi_rlength_ahdr {
  	__be16 ahslength;
  	uint8_t ahstype;
  	uint8_t reserved;
  	__be32 read_length;
  };
  
  /* Extended CDB AHS */
  struct iscsi_ecdb_ahdr {
  	__be16 ahslength;	/* CDB length - 15, including reserved byte */
  	uint8_t ahstype;
  	uint8_t reserved;
  	/* 4-byte aligned extended CDB spillover */
  	uint8_t ecdb[SCSI_MAX_VARLEN_CDB_SIZE - ISCSI_CDB_SIZE];
  };
  
  /* SCSI Response Header */
  struct iscsi_scsi_rsp {
  	uint8_t opcode;
  	uint8_t flags;
  	uint8_t response;
  	uint8_t cmd_status;
  	uint8_t hlength;
  	uint8_t dlength[3];
  	uint8_t rsvd[8];
  	itt_t	 itt;	/* Initiator Task Tag */
  	__be32	rsvd1;
  	__be32	statsn;
  	__be32	exp_cmdsn;
  	__be32	max_cmdsn;
  	__be32	exp_datasn;
  	__be32	bi_residual_count;
  	__be32	residual_count;
  	/* Response or Sense Data (optional) */
  };
  
  /* Command Response PDU flags */
  #define ISCSI_FLAG_CMD_BIDI_OVERFLOW	0x10
  #define ISCSI_FLAG_CMD_BIDI_UNDERFLOW	0x08
  #define ISCSI_FLAG_CMD_OVERFLOW		0x04
  #define ISCSI_FLAG_CMD_UNDERFLOW	0x02
  
  /* iSCSI Status values. Valid if Rsp Selector bit is not set */
  #define ISCSI_STATUS_CMD_COMPLETED	0
  #define ISCSI_STATUS_TARGET_FAILURE	1
  #define ISCSI_STATUS_SUBSYS_FAILURE	2
  
  /* Asynchronous Event Header */
  struct iscsi_async {
  	uint8_t opcode;
  	uint8_t flags;
  	uint8_t rsvd2[2];
  	uint8_t rsvd3;
  	uint8_t dlength[3];
  	struct scsi_lun	lun;
  	uint8_t rsvd4[8];
  	__be32	statsn;
  	__be32	exp_cmdsn;
  	__be32	max_cmdsn;
  	uint8_t async_event;
  	uint8_t async_vcode;
  	__be16	param1;
  	__be16	param2;
  	__be16	param3;
  	uint8_t rsvd5[4];
  };
  
  /* iSCSI Event Codes */
  #define ISCSI_ASYNC_MSG_SCSI_EVENT			0
  #define ISCSI_ASYNC_MSG_REQUEST_LOGOUT			1
  #define ISCSI_ASYNC_MSG_DROPPING_CONNECTION		2
  #define ISCSI_ASYNC_MSG_DROPPING_ALL_CONNECTIONS	3
  #define ISCSI_ASYNC_MSG_PARAM_NEGOTIATION		4
  #define ISCSI_ASYNC_MSG_VENDOR_SPECIFIC			255
  
  /* NOP-Out Message */
  struct iscsi_nopout {
  	uint8_t opcode;
  	uint8_t flags;
  	__be16	rsvd2;
  	uint8_t rsvd3;
  	uint8_t dlength[3];
  	struct scsi_lun	lun;
  	itt_t	 itt;	/* Initiator Task Tag */
  	__be32	ttt;	/* Target Transfer Tag */
  	__be32	cmdsn;
  	__be32	exp_statsn;
  	uint8_t rsvd4[16];
  };
  
  /* NOP-In Message */
  struct iscsi_nopin {
  	uint8_t opcode;
  	uint8_t flags;
  	__be16	rsvd2;
  	uint8_t rsvd3;
  	uint8_t dlength[3];
  	struct scsi_lun	lun;
  	itt_t	 itt;	/* Initiator Task Tag */
  	__be32	ttt;	/* Target Transfer Tag */
  	__be32	statsn;
  	__be32	exp_cmdsn;
  	__be32	max_cmdsn;
  	uint8_t rsvd4[12];
  };
  
  /* SCSI Task Management Message Header */
  struct iscsi_tm {
  	uint8_t opcode;
  	uint8_t flags;
  	uint8_t rsvd1[2];
  	uint8_t hlength;
  	uint8_t dlength[3];
  	struct scsi_lun lun;
  	itt_t	 itt;	/* Initiator Task Tag */
  	itt_t	 rtt;	/* Reference Task Tag */
  	__be32	cmdsn;
  	__be32	exp_statsn;
  	__be32	refcmdsn;
  	__be32	exp_datasn;
  	uint8_t rsvd2[8];
  };
  
  #define ISCSI_FLAG_TM_FUNC_MASK			0x7F
  
  /* Function values */
  #define ISCSI_TM_FUNC_ABORT_TASK		1
  #define ISCSI_TM_FUNC_ABORT_TASK_SET		2
  #define ISCSI_TM_FUNC_CLEAR_ACA			3
  #define ISCSI_TM_FUNC_CLEAR_TASK_SET		4
  #define ISCSI_TM_FUNC_LOGICAL_UNIT_RESET	5
  #define ISCSI_TM_FUNC_TARGET_WARM_RESET		6
  #define ISCSI_TM_FUNC_TARGET_COLD_RESET		7
  #define ISCSI_TM_FUNC_TASK_REASSIGN		8
  
  #define ISCSI_TM_FUNC_VALUE(hdr) ((hdr)->flags & ISCSI_FLAG_TM_FUNC_MASK)
  
  /* SCSI Task Management Response Header */
  struct iscsi_tm_rsp {
  	uint8_t opcode;
  	uint8_t flags;
  	uint8_t response;	/* see Response values below */
  	uint8_t qualifier;
  	uint8_t hlength;
  	uint8_t dlength[3];
  	uint8_t rsvd2[8];
  	itt_t	 itt;	/* Initiator Task Tag */
  	itt_t	 rtt;	/* Reference Task Tag */
  	__be32	statsn;
  	__be32	exp_cmdsn;
  	__be32	max_cmdsn;
  	uint8_t rsvd3[12];
  };
  
  /* Response values */
  #define ISCSI_TMF_RSP_COMPLETE		0x00
  #define ISCSI_TMF_RSP_NO_TASK		0x01
  #define ISCSI_TMF_RSP_NO_LUN		0x02
  #define ISCSI_TMF_RSP_TASK_ALLEGIANT	0x03
  #define ISCSI_TMF_RSP_NO_FAILOVER	0x04
  #define ISCSI_TMF_RSP_NOT_SUPPORTED	0x05
  #define ISCSI_TMF_RSP_AUTH_FAILED	0x06
  #define ISCSI_TMF_RSP_REJECTED		0xff
  
  /* Ready To Transfer Header */
  struct iscsi_r2t_rsp {
  	uint8_t opcode;
  	uint8_t flags;
  	uint8_t rsvd2[2];
  	uint8_t	hlength;
  	uint8_t	dlength[3];
  	struct scsi_lun	lun;
  	itt_t	 itt;	/* Initiator Task Tag */
  	__be32	ttt;	/* Target Transfer Tag */
  	__be32	statsn;
  	__be32	exp_cmdsn;
  	__be32	max_cmdsn;
  	__be32	r2tsn;
  	__be32	data_offset;
  	__be32	data_length;
  };
  
  /* SCSI Data Hdr */
  struct iscsi_data {
  	uint8_t opcode;
  	uint8_t flags;
  	uint8_t rsvd2[2];
  	uint8_t rsvd3;
  	uint8_t dlength[3];
  	struct scsi_lun lun;
  	itt_t	 itt;
  	__be32	ttt;
  	__be32	rsvd4;
  	__be32	exp_statsn;
  	__be32	rsvd5;
  	__be32	datasn;
  	__be32	offset;
  	__be32	rsvd6;
  	/* Payload */
  };
  
  /* SCSI Data Response Hdr */
  struct iscsi_data_rsp {
  	uint8_t opcode;
  	uint8_t flags;
  	uint8_t rsvd2;
  	uint8_t cmd_status;
  	uint8_t hlength;
  	uint8_t dlength[3];
  	struct scsi_lun	lun;
  	itt_t	 itt;
  	__be32	ttt;
  	__be32	statsn;
  	__be32	exp_cmdsn;
  	__be32	max_cmdsn;
  	__be32	datasn;
  	__be32	offset;
  	__be32	residual_count;
  };
  
  /* Data Response PDU flags */
  #define ISCSI_FLAG_DATA_ACK		0x40
  #define ISCSI_FLAG_DATA_OVERFLOW	0x04
  #define ISCSI_FLAG_DATA_UNDERFLOW	0x02
  #define ISCSI_FLAG_DATA_STATUS		0x01
  
  /* Text Header */
  struct iscsi_text {
  	uint8_t opcode;
  	uint8_t flags;
  	uint8_t rsvd2[2];
  	uint8_t hlength;
  	uint8_t dlength[3];
  	uint8_t rsvd4[8];
  	itt_t	 itt;
  	__be32	ttt;
  	__be32	cmdsn;
  	__be32	exp_statsn;
  	uint8_t rsvd5[16];
  	/* Text - key=value pairs */
  };
  
  #define ISCSI_FLAG_TEXT_CONTINUE	0x40
  
  /* Text Response Header */
  struct iscsi_text_rsp {
  	uint8_t opcode;
  	uint8_t flags;
  	uint8_t rsvd2[2];
  	uint8_t hlength;
  	uint8_t dlength[3];
  	uint8_t rsvd4[8];
  	itt_t	 itt;
  	__be32	ttt;
  	__be32	statsn;
  	__be32	exp_cmdsn;
  	__be32	max_cmdsn;
  	uint8_t rsvd5[12];
  	/* Text Response - key:value pairs */
  };
  
  /* Login Header */
  struct iscsi_login_req {
  	uint8_t opcode;
  	uint8_t flags;
  	uint8_t max_version;	/* Max. version supported */
  	uint8_t min_version;	/* Min. version supported */
  	uint8_t hlength;
  	uint8_t dlength[3];
  	uint8_t isid[6];	/* Initiator Session ID */
  	__be16	tsih;	/* Target Session Handle */
  	itt_t	 itt;	/* Initiator Task Tag */
  	__be16	cid;
  	__be16	rsvd3;
  	__be32	cmdsn;
  	__be32	exp_statsn;
  	uint8_t rsvd5[16];
  };
  
  /* Login PDU flags */
  #define ISCSI_FLAG_LOGIN_TRANSIT		0x80
  #define ISCSI_FLAG_LOGIN_CONTINUE		0x40
  #define ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK	0x0C	/* 2 bits */
  #define ISCSI_FLAG_LOGIN_CURRENT_STAGE1		0x04
  #define ISCSI_FLAG_LOGIN_CURRENT_STAGE2		0x08
  #define ISCSI_FLAG_LOGIN_CURRENT_STAGE3		0x0C
  #define ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK	0x03	/* 2 bits */
  #define ISCSI_FLAG_LOGIN_NEXT_STAGE1		0x01
  #define ISCSI_FLAG_LOGIN_NEXT_STAGE2		0x02
  #define ISCSI_FLAG_LOGIN_NEXT_STAGE3		0x03
  
  #define ISCSI_LOGIN_CURRENT_STAGE(flags) \
  	((flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2)
  #define ISCSI_LOGIN_NEXT_STAGE(flags) \
  	(flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK)
  
  /* Login Response Header */
  struct iscsi_login_rsp {
  	uint8_t opcode;
  	uint8_t flags;
  	uint8_t max_version;	/* Max. version supported */
  	uint8_t active_version;	/* Active version */
  	uint8_t hlength;
  	uint8_t dlength[3];
  	uint8_t isid[6];	/* Initiator Session ID */
  	__be16	tsih;	/* Target Session Handle */
  	itt_t	 itt;	/* Initiator Task Tag */
  	__be32	rsvd3;
  	__be32	statsn;
  	__be32	exp_cmdsn;
  	__be32	max_cmdsn;
  	uint8_t status_class;	/* see Login RSP ststus classes below */
  	uint8_t status_detail;	/* see Login RSP Status details below */
  	uint8_t rsvd4[10];
  };
  
  /* Login stage (phase) codes for CSG, NSG */
  #define ISCSI_INITIAL_LOGIN_STAGE		-1
  #define ISCSI_SECURITY_NEGOTIATION_STAGE	0
  #define ISCSI_OP_PARMS_NEGOTIATION_STAGE	1
  #define ISCSI_FULL_FEATURE_PHASE		3
  
  /* Login Status response classes */
  #define ISCSI_STATUS_CLS_SUCCESS		0x00
  #define ISCSI_STATUS_CLS_REDIRECT		0x01
  #define ISCSI_STATUS_CLS_INITIATOR_ERR		0x02
  #define ISCSI_STATUS_CLS_TARGET_ERR		0x03
  
  /* Login Status response detail codes */
  /* Class-0 (Success) */
  #define ISCSI_LOGIN_STATUS_ACCEPT		0x00
  
  /* Class-1 (Redirection) */
  #define ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP	0x01
  #define ISCSI_LOGIN_STATUS_TGT_MOVED_PERM	0x02
  
  /* Class-2 (Initiator Error) */
  #define ISCSI_LOGIN_STATUS_INIT_ERR		0x00
  #define ISCSI_LOGIN_STATUS_AUTH_FAILED		0x01
  #define ISCSI_LOGIN_STATUS_TGT_FORBIDDEN	0x02
  #define ISCSI_LOGIN_STATUS_TGT_NOT_FOUND	0x03
  #define ISCSI_LOGIN_STATUS_TGT_REMOVED		0x04
  #define ISCSI_LOGIN_STATUS_NO_VERSION		0x05
  #define ISCSI_LOGIN_STATUS_ISID_ERROR		0x06
  #define ISCSI_LOGIN_STATUS_MISSING_FIELDS	0x07
  #define ISCSI_LOGIN_STATUS_CONN_ADD_FAILED	0x08
  #define ISCSI_LOGIN_STATUS_NO_SESSION_TYPE	0x09
  #define ISCSI_LOGIN_STATUS_NO_SESSION		0x0a
  #define ISCSI_LOGIN_STATUS_INVALID_REQUEST	0x0b
  
  /* Class-3 (Target Error) */
  #define ISCSI_LOGIN_STATUS_TARGET_ERROR		0x00
  #define ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE	0x01
  #define ISCSI_LOGIN_STATUS_NO_RESOURCES		0x02
  
  /* Logout Header */
  struct iscsi_logout {
  	uint8_t opcode;
  	uint8_t flags;
  	uint8_t rsvd1[2];
  	uint8_t hlength;
  	uint8_t dlength[3];
  	uint8_t rsvd2[8];
  	itt_t	 itt;	/* Initiator Task Tag */
  	__be16	cid;
  	uint8_t rsvd3[2];
  	__be32	cmdsn;
  	__be32	exp_statsn;
  	uint8_t rsvd4[16];
  };
  
  /* Logout PDU flags */
  #define ISCSI_FLAG_LOGOUT_REASON_MASK	0x7F
  
  /* logout reason_code values */
  
  #define ISCSI_LOGOUT_REASON_CLOSE_SESSION	0
  #define ISCSI_LOGOUT_REASON_CLOSE_CONNECTION	1
  #define ISCSI_LOGOUT_REASON_RECOVERY		2
  #define ISCSI_LOGOUT_REASON_AEN_REQUEST		3
  
  /* Logout Response Header */
  struct iscsi_logout_rsp {
  	uint8_t opcode;
  	uint8_t flags;
  	uint8_t response;	/* see Logout response values below */
  	uint8_t rsvd2;
  	uint8_t hlength;
  	uint8_t dlength[3];
  	uint8_t rsvd3[8];
  	itt_t	 itt;	/* Initiator Task Tag */
  	__be32	rsvd4;
  	__be32	statsn;
  	__be32	exp_cmdsn;
  	__be32	max_cmdsn;
  	__be32	rsvd5;
  	__be16	t2wait;
  	__be16	t2retain;
  	__be32	rsvd6;
  };
  
  /* logout response status values */
  
  #define ISCSI_LOGOUT_SUCCESS			0
  #define ISCSI_LOGOUT_CID_NOT_FOUND		1
  #define ISCSI_LOGOUT_RECOVERY_UNSUPPORTED	2
  #define ISCSI_LOGOUT_CLEANUP_FAILED		3
  
  /* SNACK Header */
  struct iscsi_snack {
  	uint8_t opcode;
  	uint8_t flags;
  	uint8_t rsvd2[2];
  	uint8_t hlength;
  	uint8_t dlength[3];
  	uint8_t lun[8];
  	itt_t	 itt;
  	__be32  ttt;
  	uint8_t rsvd3[4];
  	__be32  exp_statsn;
  	uint8_t rsvd4[8];
  	__be32	begrun;
  	__be32	runlength;
  };
  
  /* SNACK PDU flags */
  #define ISCSI_FLAG_SNACK_TYPE_DATA		0
  #define ISCSI_FLAG_SNACK_TYPE_R2T		0
  #define ISCSI_FLAG_SNACK_TYPE_STATUS		1
  #define ISCSI_FLAG_SNACK_TYPE_DATA_ACK		2
  #define ISCSI_FLAG_SNACK_TYPE_RDATA		3
  #define ISCSI_FLAG_SNACK_TYPE_MASK	0x0F	/* 4 bits */
  
  /* Reject Message Header */
  struct iscsi_reject {
  	uint8_t opcode;
  	uint8_t flags;
  	uint8_t reason;
  	uint8_t rsvd2;
  	uint8_t hlength;
  	uint8_t dlength[3];
  	uint8_t rsvd3[8];
  	__be32  ffffffff;
  	uint8_t rsvd4[4];
  	__be32	statsn;
  	__be32	exp_cmdsn;
  	__be32	max_cmdsn;
  	__be32	datasn;
  	uint8_t rsvd5[8];
  	/* Text - Rejected hdr */
  };
  
  /* Reason for Reject */
  #define ISCSI_REASON_CMD_BEFORE_LOGIN	1
  #define ISCSI_REASON_DATA_DIGEST_ERROR	2
  #define ISCSI_REASON_DATA_SNACK_REJECT	3
  #define ISCSI_REASON_PROTOCOL_ERROR	4
  #define ISCSI_REASON_CMD_NOT_SUPPORTED	5
  #define ISCSI_REASON_IMM_CMD_REJECT		6
  #define ISCSI_REASON_TASK_IN_PROGRESS	7
  #define ISCSI_REASON_INVALID_SNACK		8
  #define ISCSI_REASON_BOOKMARK_INVALID	9
  #define ISCSI_REASON_BOOKMARK_NO_RESOURCES	10
  #define ISCSI_REASON_NEGOTIATION_RESET	11
  
  /* Max. number of Key=Value pairs in a text message */
  #define MAX_KEY_VALUE_PAIRS	8192
  
  /* maximum length for text keys/values */
  #define KEY_MAXLEN		64
  #define VALUE_MAXLEN		255
  #define TARGET_NAME_MAXLEN	VALUE_MAXLEN
  
  #define ISCSI_DEF_MAX_RECV_SEG_LEN		8192
  #define ISCSI_MIN_MAX_RECV_SEG_LEN		512
  #define ISCSI_MAX_MAX_RECV_SEG_LEN		16777215
  
  #define ISCSI_DEF_FIRST_BURST_LEN		65536
  #define ISCSI_MIN_FIRST_BURST_LEN		512
  #define ISCSI_MAX_FIRST_BURST_LEN		16777215
  
  #define ISCSI_DEF_MAX_BURST_LEN			262144
  #define ISCSI_MIN_MAX_BURST_LEN			512
  #define ISCSI_MAX_MAX_BURST_LEN			16777215
  
  #define ISCSI_DEF_TIME2WAIT			2
  
  #define ISCSI_NAME_LEN				224
  
  /************************* RFC 3720 End *****************************/
  
  #endif /* ISCSI_PROTO_H */