CoCalc -- iscsi

GitHub Repository: awilliam/linux-vfio
Path: blob/master/include/scsi/iscsi_proto.h
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/*
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 * RFC 3720 (iSCSI) protocol data types
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 *
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 * Copyright (C) 2005 Dmitry Yusupov
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 * Copyright (C) 2005 Alex Aizman
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 * maintained by [email protected]
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published
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 * by the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but
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 * WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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 * General Public License for more details.
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 *
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 * See the file COPYING included with this distribution for more details.
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 */
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#ifndef ISCSI_PROTO_H
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#define ISCSI_PROTO_H
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#include <linux/types.h>
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#include <scsi/scsi.h>
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#define ISCSI_DRAFT20_VERSION	0x00
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/* default iSCSI listen port for incoming connections */
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#define ISCSI_LISTEN_PORT	3260
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/* Padding word length */
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#define ISCSI_PAD_LEN		4
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/*
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 * useful common(control and data pathes) macro
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 */
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#define ntoh24(p) (((p)[0] << 16) | ((p)[1] << 8) | ((p)[2]))
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#define hton24(p, v) { \
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        p[0] = (((v) >> 16) & 0xFF); \
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        p[1] = (((v) >> 8) & 0xFF); \
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        p[2] = ((v) & 0xFF); \
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}
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#define zero_data(p) {p[0]=0;p[1]=0;p[2]=0;}
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/* initiator tags; opaque for target */
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typedef uint32_t __bitwise__ itt_t;
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/* below makes sense only for initiator that created this tag */
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#define build_itt(itt, age) ((__force itt_t)\
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	((itt) | ((age) << ISCSI_AGE_SHIFT)))
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#define get_itt(itt) ((__force uint32_t)(itt_t)(itt) & ISCSI_ITT_MASK)
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#define RESERVED_ITT ((__force itt_t)0xffffffff)
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/*
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 * iSCSI Template Message Header
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 */
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struct iscsi_hdr {
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	uint8_t		opcode;
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	uint8_t		flags;		/* Final bit */
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	uint8_t		rsvd2[2];
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	uint8_t		hlength;	/* AHSs total length */
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	uint8_t		dlength[3];	/* Data length */
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	uint8_t		lun[8];
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	itt_t		itt;		/* Initiator Task Tag, opaque for target */
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	__be32		ttt;		/* Target Task Tag */
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	__be32		statsn;
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	__be32		exp_statsn;
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	__be32		max_statsn;
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	uint8_t		other[12];
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};
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/************************* RFC 3720 Begin *****************************/
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#define ISCSI_RESERVED_TAG		0xffffffff
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/* Opcode encoding bits */
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#define ISCSI_OP_RETRY			0x80
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#define ISCSI_OP_IMMEDIATE		0x40
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#define ISCSI_OPCODE_MASK		0x3F
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/* Initiator Opcode values */
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#define ISCSI_OP_NOOP_OUT		0x00
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#define ISCSI_OP_SCSI_CMD		0x01
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#define ISCSI_OP_SCSI_TMFUNC		0x02
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#define ISCSI_OP_LOGIN			0x03
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#define ISCSI_OP_TEXT			0x04
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#define ISCSI_OP_SCSI_DATA_OUT		0x05
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#define ISCSI_OP_LOGOUT			0x06
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#define ISCSI_OP_SNACK			0x10
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#define ISCSI_OP_VENDOR1_CMD		0x1c
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#define ISCSI_OP_VENDOR2_CMD		0x1d
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#define ISCSI_OP_VENDOR3_CMD		0x1e
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#define ISCSI_OP_VENDOR4_CMD		0x1f
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/* Target Opcode values */
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#define ISCSI_OP_NOOP_IN		0x20
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#define ISCSI_OP_SCSI_CMD_RSP		0x21
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#define ISCSI_OP_SCSI_TMFUNC_RSP	0x22
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#define ISCSI_OP_LOGIN_RSP		0x23
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#define ISCSI_OP_TEXT_RSP		0x24
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#define ISCSI_OP_SCSI_DATA_IN		0x25
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#define ISCSI_OP_LOGOUT_RSP		0x26
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#define ISCSI_OP_R2T			0x31
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#define ISCSI_OP_ASYNC_EVENT		0x32
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#define ISCSI_OP_REJECT			0x3f
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struct iscsi_ahs_hdr {
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	__be16 ahslength;
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	uint8_t ahstype;
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	uint8_t ahspec[5];
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};
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#define ISCSI_AHSTYPE_CDB		1
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#define ISCSI_AHSTYPE_RLENGTH		2
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#define ISCSI_CDB_SIZE			16
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/* iSCSI PDU Header */
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struct iscsi_cmd {
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	uint8_t opcode;
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	uint8_t flags;
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	__be16 rsvd2;
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	uint8_t hlength;
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	uint8_t dlength[3];
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	uint8_t lun[8];
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	itt_t	 itt;	/* Initiator Task Tag */
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	__be32 data_length;
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	__be32 cmdsn;
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	__be32 exp_statsn;
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	uint8_t cdb[ISCSI_CDB_SIZE];	/* SCSI Command Block */
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	/* Additional Data (Command Dependent) */
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};
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/* Command PDU flags */
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#define ISCSI_FLAG_CMD_FINAL		0x80
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#define ISCSI_FLAG_CMD_READ		0x40
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#define ISCSI_FLAG_CMD_WRITE		0x20
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#define ISCSI_FLAG_CMD_ATTR_MASK	0x07	/* 3 bits */
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/* SCSI Command Attribute values */
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#define ISCSI_ATTR_UNTAGGED		0
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#define ISCSI_ATTR_SIMPLE		1
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#define ISCSI_ATTR_ORDERED		2
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#define ISCSI_ATTR_HEAD_OF_QUEUE	3
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#define ISCSI_ATTR_ACA			4
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struct iscsi_rlength_ahdr {
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	__be16 ahslength;
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	uint8_t ahstype;
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	uint8_t reserved;
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	__be32 read_length;
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};
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/* Extended CDB AHS */
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struct iscsi_ecdb_ahdr {
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	__be16 ahslength;	/* CDB length - 15, including reserved byte */
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	uint8_t ahstype;
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	uint8_t reserved;
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	/* 4-byte aligned extended CDB spillover */
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	uint8_t ecdb[SCSI_MAX_VARLEN_CDB_SIZE - ISCSI_CDB_SIZE];
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};
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/* SCSI Response Header */
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struct iscsi_cmd_rsp {
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	uint8_t opcode;
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	uint8_t flags;
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	uint8_t response;
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	uint8_t cmd_status;
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	uint8_t hlength;
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	uint8_t dlength[3];
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	uint8_t rsvd[8];
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	itt_t	 itt;	/* Initiator Task Tag */
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	__be32	rsvd1;
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	__be32	statsn;
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	__be32	exp_cmdsn;
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	__be32	max_cmdsn;
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	__be32	exp_datasn;
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	__be32	bi_residual_count;
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	__be32	residual_count;
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	/* Response or Sense Data (optional) */
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};
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/* Command Response PDU flags */
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#define ISCSI_FLAG_CMD_BIDI_OVERFLOW	0x10
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#define ISCSI_FLAG_CMD_BIDI_UNDERFLOW	0x08
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#define ISCSI_FLAG_CMD_OVERFLOW		0x04
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#define ISCSI_FLAG_CMD_UNDERFLOW	0x02
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/* iSCSI Status values. Valid if Rsp Selector bit is not set */
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#define ISCSI_STATUS_CMD_COMPLETED	0
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#define ISCSI_STATUS_TARGET_FAILURE	1
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#define ISCSI_STATUS_SUBSYS_FAILURE	2
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/* Asynchronous Event Header */
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struct iscsi_async {
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	uint8_t opcode;
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	uint8_t flags;
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	uint8_t rsvd2[2];
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	uint8_t rsvd3;
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	uint8_t dlength[3];
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	uint8_t lun[8];
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	uint8_t rsvd4[8];
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	__be32	statsn;
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	__be32	exp_cmdsn;
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	__be32	max_cmdsn;
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	uint8_t async_event;
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	uint8_t async_vcode;
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	__be16	param1;
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	__be16	param2;
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	__be16	param3;
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	uint8_t rsvd5[4];
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};
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/* iSCSI Event Codes */
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#define ISCSI_ASYNC_MSG_SCSI_EVENT			0
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#define ISCSI_ASYNC_MSG_REQUEST_LOGOUT			1
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#define ISCSI_ASYNC_MSG_DROPPING_CONNECTION		2
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#define ISCSI_ASYNC_MSG_DROPPING_ALL_CONNECTIONS	3
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#define ISCSI_ASYNC_MSG_PARAM_NEGOTIATION		4
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#define ISCSI_ASYNC_MSG_VENDOR_SPECIFIC			255
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/* NOP-Out Message */
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struct iscsi_nopout {
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	uint8_t opcode;
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	uint8_t flags;
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	__be16	rsvd2;
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	uint8_t rsvd3;
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	uint8_t dlength[3];
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	uint8_t lun[8];
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	itt_t	 itt;	/* Initiator Task Tag */
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	__be32	ttt;	/* Target Transfer Tag */
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	__be32	cmdsn;
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	__be32	exp_statsn;
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	uint8_t rsvd4[16];
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};
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/* NOP-In Message */
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struct iscsi_nopin {
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	uint8_t opcode;
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	uint8_t flags;
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	__be16	rsvd2;
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	uint8_t rsvd3;
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	uint8_t dlength[3];
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	uint8_t lun[8];
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	itt_t	 itt;	/* Initiator Task Tag */
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	__be32	ttt;	/* Target Transfer Tag */
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	__be32	statsn;
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	__be32	exp_cmdsn;
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	__be32	max_cmdsn;
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	uint8_t rsvd4[12];
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};
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/* SCSI Task Management Message Header */
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struct iscsi_tm {
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	uint8_t opcode;
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	uint8_t flags;
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	uint8_t rsvd1[2];
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	uint8_t hlength;
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	uint8_t dlength[3];
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	uint8_t lun[8];
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	itt_t	 itt;	/* Initiator Task Tag */
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	itt_t	 rtt;	/* Reference Task Tag */
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	__be32	cmdsn;
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	__be32	exp_statsn;
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	__be32	refcmdsn;
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	__be32	exp_datasn;
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	uint8_t rsvd2[8];
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};
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#define ISCSI_FLAG_TM_FUNC_MASK			0x7F
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/* Function values */
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#define ISCSI_TM_FUNC_ABORT_TASK		1
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#define ISCSI_TM_FUNC_ABORT_TASK_SET		2
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#define ISCSI_TM_FUNC_CLEAR_ACA			3
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#define ISCSI_TM_FUNC_CLEAR_TASK_SET		4
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#define ISCSI_TM_FUNC_LOGICAL_UNIT_RESET	5
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#define ISCSI_TM_FUNC_TARGET_WARM_RESET		6
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#define ISCSI_TM_FUNC_TARGET_COLD_RESET		7
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#define ISCSI_TM_FUNC_TASK_REASSIGN		8
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#define ISCSI_TM_FUNC_VALUE(hdr) ((hdr)->flags & ISCSI_FLAG_TM_FUNC_MASK)
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/* SCSI Task Management Response Header */
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struct iscsi_tm_rsp {
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	uint8_t opcode;
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	uint8_t flags;
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	uint8_t response;	/* see Response values below */
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	uint8_t qualifier;
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	uint8_t hlength;
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	uint8_t dlength[3];
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	uint8_t rsvd2[8];
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	itt_t	 itt;	/* Initiator Task Tag */
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	itt_t	 rtt;	/* Reference Task Tag */
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	__be32	statsn;
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	__be32	exp_cmdsn;
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	__be32	max_cmdsn;
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	uint8_t rsvd3[12];
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};
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/* Response values */
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#define ISCSI_TMF_RSP_COMPLETE		0x00
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#define ISCSI_TMF_RSP_NO_TASK		0x01
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#define ISCSI_TMF_RSP_NO_LUN		0x02
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#define ISCSI_TMF_RSP_TASK_ALLEGIANT	0x03
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#define ISCSI_TMF_RSP_NO_FAILOVER	0x04
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#define ISCSI_TMF_RSP_NOT_SUPPORTED	0x05
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#define ISCSI_TMF_RSP_AUTH_FAILED	0x06
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#define ISCSI_TMF_RSP_REJECTED		0xff
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/* Ready To Transfer Header */
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struct iscsi_r2t_rsp {
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	uint8_t opcode;
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	uint8_t flags;
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	uint8_t rsvd2[2];
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	uint8_t	hlength;
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	uint8_t	dlength[3];
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	uint8_t lun[8];
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	itt_t	 itt;	/* Initiator Task Tag */
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	__be32	ttt;	/* Target Transfer Tag */
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	__be32	statsn;
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	__be32	exp_cmdsn;
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	__be32	max_cmdsn;
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	__be32	r2tsn;
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	__be32	data_offset;
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	__be32	data_length;
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};
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/* SCSI Data Hdr */
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struct iscsi_data {
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	uint8_t opcode;
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	uint8_t flags;
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	uint8_t rsvd2[2];
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	uint8_t rsvd3;
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	uint8_t dlength[3];
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	uint8_t lun[8];
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	itt_t	 itt;
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	__be32	ttt;
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	__be32	rsvd4;
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	__be32	exp_statsn;
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	__be32	rsvd5;
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	__be32	datasn;
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	__be32	offset;
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	__be32	rsvd6;
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	/* Payload */
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};
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/* SCSI Data Response Hdr */
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struct iscsi_data_rsp {
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	uint8_t opcode;
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	uint8_t flags;
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	uint8_t rsvd2;
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	uint8_t cmd_status;
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	uint8_t hlength;
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	uint8_t dlength[3];
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	uint8_t lun[8];
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	itt_t	 itt;
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	__be32	ttt;
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	__be32	statsn;
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	__be32	exp_cmdsn;
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	__be32	max_cmdsn;
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	__be32	datasn;
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	__be32	offset;
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	__be32	residual_count;
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};
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/* Data Response PDU flags */
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#define ISCSI_FLAG_DATA_ACK		0x40
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#define ISCSI_FLAG_DATA_OVERFLOW	0x04
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#define ISCSI_FLAG_DATA_UNDERFLOW	0x02
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#define ISCSI_FLAG_DATA_STATUS		0x01
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/* Text Header */
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struct iscsi_text {
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	uint8_t opcode;
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	uint8_t flags;
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	uint8_t rsvd2[2];
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	uint8_t hlength;
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	uint8_t dlength[3];
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	uint8_t rsvd4[8];
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	itt_t	 itt;
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	__be32	ttt;
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	__be32	cmdsn;
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	__be32	exp_statsn;
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	uint8_t rsvd5[16];
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	/* Text - key=value pairs */
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};
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#define ISCSI_FLAG_TEXT_CONTINUE	0x40
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/* Text Response Header */
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struct iscsi_text_rsp {
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	uint8_t opcode;
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	uint8_t flags;
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	uint8_t rsvd2[2];
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	uint8_t hlength;
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	uint8_t dlength[3];
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	uint8_t rsvd4[8];
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	itt_t	 itt;
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	__be32	ttt;
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	__be32	statsn;
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	__be32	exp_cmdsn;
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	__be32	max_cmdsn;
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	uint8_t rsvd5[12];
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	/* Text Response - key:value pairs */
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};
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/* Login Header */
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struct iscsi_login {
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	uint8_t opcode;
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	uint8_t flags;
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	uint8_t max_version;	/* Max. version supported */
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	uint8_t min_version;	/* Min. version supported */
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	uint8_t hlength;
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	uint8_t dlength[3];
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	uint8_t isid[6];	/* Initiator Session ID */
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	__be16	tsih;	/* Target Session Handle */
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	itt_t	 itt;	/* Initiator Task Tag */
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	__be16	cid;
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	__be16	rsvd3;
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	__be32	cmdsn;
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	__be32	exp_statsn;
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	uint8_t rsvd5[16];
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};
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/* Login PDU flags */
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#define ISCSI_FLAG_LOGIN_TRANSIT		0x80
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#define ISCSI_FLAG_LOGIN_CONTINUE		0x40
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#define ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK	0x0C	/* 2 bits */
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#define ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK	0x03	/* 2 bits */
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#define ISCSI_LOGIN_CURRENT_STAGE(flags) \
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	((flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2)
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#define ISCSI_LOGIN_NEXT_STAGE(flags) \
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	(flags & ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK)
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/* Login Response Header */
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struct iscsi_login_rsp {
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	uint8_t opcode;
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	uint8_t flags;
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	uint8_t max_version;	/* Max. version supported */
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	uint8_t active_version;	/* Active version */
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	uint8_t hlength;
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	uint8_t dlength[3];
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	uint8_t isid[6];	/* Initiator Session ID */
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	__be16	tsih;	/* Target Session Handle */
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	itt_t	 itt;	/* Initiator Task Tag */
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	__be32	rsvd3;
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	__be32	statsn;
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	__be32	exp_cmdsn;
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	__be32	max_cmdsn;
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	uint8_t status_class;	/* see Login RSP ststus classes below */
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	uint8_t status_detail;	/* see Login RSP Status details below */
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	uint8_t rsvd4[10];
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};
456

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/* Login stage (phase) codes for CSG, NSG */
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#define ISCSI_INITIAL_LOGIN_STAGE		-1
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#define ISCSI_SECURITY_NEGOTIATION_STAGE	0
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#define ISCSI_OP_PARMS_NEGOTIATION_STAGE	1
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#define ISCSI_FULL_FEATURE_PHASE		3
462

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/* Login Status response classes */
464
#define ISCSI_STATUS_CLS_SUCCESS		0x00
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#define ISCSI_STATUS_CLS_REDIRECT		0x01
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#define ISCSI_STATUS_CLS_INITIATOR_ERR		0x02
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#define ISCSI_STATUS_CLS_TARGET_ERR		0x03
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/* Login Status response detail codes */
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/* Class-0 (Success) */
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#define ISCSI_LOGIN_STATUS_ACCEPT		0x00
472

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/* Class-1 (Redirection) */
474
#define ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP	0x01
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#define ISCSI_LOGIN_STATUS_TGT_MOVED_PERM	0x02
476

477
/* Class-2 (Initiator Error) */
478
#define ISCSI_LOGIN_STATUS_INIT_ERR		0x00
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#define ISCSI_LOGIN_STATUS_AUTH_FAILED		0x01
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#define ISCSI_LOGIN_STATUS_TGT_FORBIDDEN	0x02
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#define ISCSI_LOGIN_STATUS_TGT_NOT_FOUND	0x03
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#define ISCSI_LOGIN_STATUS_TGT_REMOVED		0x04
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#define ISCSI_LOGIN_STATUS_NO_VERSION		0x05
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#define ISCSI_LOGIN_STATUS_ISID_ERROR		0x06
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#define ISCSI_LOGIN_STATUS_MISSING_FIELDS	0x07
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#define ISCSI_LOGIN_STATUS_CONN_ADD_FAILED	0x08
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#define ISCSI_LOGIN_STATUS_NO_SESSION_TYPE	0x09
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#define ISCSI_LOGIN_STATUS_NO_SESSION		0x0a
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#define ISCSI_LOGIN_STATUS_INVALID_REQUEST	0x0b
490

491
/* Class-3 (Target Error) */
492
#define ISCSI_LOGIN_STATUS_TARGET_ERROR		0x00
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#define ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE	0x01
494
#define ISCSI_LOGIN_STATUS_NO_RESOURCES		0x02
495

496
/* Logout Header */
497
struct iscsi_logout {
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	uint8_t opcode;
499
	uint8_t flags;
500
	uint8_t rsvd1[2];
501
	uint8_t hlength;
502
	uint8_t dlength[3];
503
	uint8_t rsvd2[8];
504
	itt_t	 itt;	/* Initiator Task Tag */
505
	__be16	cid;
506
	uint8_t rsvd3[2];
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	__be32	cmdsn;
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	__be32	exp_statsn;
509
	uint8_t rsvd4[16];
510
};
511

512
/* Logout PDU flags */
513
#define ISCSI_FLAG_LOGOUT_REASON_MASK	0x7F
514

515
/* logout reason_code values */
516

517
#define ISCSI_LOGOUT_REASON_CLOSE_SESSION	0
518
#define ISCSI_LOGOUT_REASON_CLOSE_CONNECTION	1
519
#define ISCSI_LOGOUT_REASON_RECOVERY		2
520
#define ISCSI_LOGOUT_REASON_AEN_REQUEST		3
521

522
/* Logout Response Header */
523
struct iscsi_logout_rsp {
524
	uint8_t opcode;
525
	uint8_t flags;
526
	uint8_t response;	/* see Logout response values below */
527
	uint8_t rsvd2;
528
	uint8_t hlength;
529
	uint8_t dlength[3];
530
	uint8_t rsvd3[8];
531
	itt_t	 itt;	/* Initiator Task Tag */
532
	__be32	rsvd4;
533
	__be32	statsn;
534
	__be32	exp_cmdsn;
535
	__be32	max_cmdsn;
536
	__be32	rsvd5;
537
	__be16	t2wait;
538
	__be16	t2retain;
539
	__be32	rsvd6;
540
};
541

542
/* logout response status values */
543

544
#define ISCSI_LOGOUT_SUCCESS			0
545
#define ISCSI_LOGOUT_CID_NOT_FOUND		1
546
#define ISCSI_LOGOUT_RECOVERY_UNSUPPORTED	2
547
#define ISCSI_LOGOUT_CLEANUP_FAILED		3
548

549
/* SNACK Header */
550
struct iscsi_snack {
551
	uint8_t opcode;
552
	uint8_t flags;
553
	uint8_t rsvd2[14];
554
	itt_t	 itt;
555
	__be32	begrun;
556
	__be32	runlength;
557
	__be32	exp_statsn;
558
	__be32	rsvd3;
559
	__be32	exp_datasn;
560
	uint8_t rsvd6[8];
561
};
562

563
/* SNACK PDU flags */
564
#define ISCSI_FLAG_SNACK_TYPE_MASK	0x0F	/* 4 bits */
565

566
/* Reject Message Header */
567
struct iscsi_reject {
568
	uint8_t opcode;
569
	uint8_t flags;
570
	uint8_t reason;
571
	uint8_t rsvd2;
572
	uint8_t hlength;
573
	uint8_t dlength[3];
574
	uint8_t rsvd3[8];
575
	__be32  ffffffff;
576
	uint8_t rsvd4[4];
577
	__be32	statsn;
578
	__be32	exp_cmdsn;
579
	__be32	max_cmdsn;
580
	__be32	datasn;
581
	uint8_t rsvd5[8];
582
	/* Text - Rejected hdr */
583
};
584

585
/* Reason for Reject */
586
#define ISCSI_REASON_CMD_BEFORE_LOGIN	1
587
#define ISCSI_REASON_DATA_DIGEST_ERROR	2
588
#define ISCSI_REASON_DATA_SNACK_REJECT	3
589
#define ISCSI_REASON_PROTOCOL_ERROR	4
590
#define ISCSI_REASON_CMD_NOT_SUPPORTED	5
591
#define ISCSI_REASON_IMM_CMD_REJECT		6
592
#define ISCSI_REASON_TASK_IN_PROGRESS	7
593
#define ISCSI_REASON_INVALID_SNACK		8
594
#define ISCSI_REASON_BOOKMARK_INVALID	9
595
#define ISCSI_REASON_BOOKMARK_NO_RESOURCES	10
596
#define ISCSI_REASON_NEGOTIATION_RESET	11
597

598
/* Max. number of Key=Value pairs in a text message */
599
#define MAX_KEY_VALUE_PAIRS	8192
600

601
/* maximum length for text keys/values */
602
#define KEY_MAXLEN		64
603
#define VALUE_MAXLEN		255
604
#define TARGET_NAME_MAXLEN	VALUE_MAXLEN
605

606
#define ISCSI_DEF_MAX_RECV_SEG_LEN		8192
607
#define ISCSI_MIN_MAX_RECV_SEG_LEN		512
608
#define ISCSI_MAX_MAX_RECV_SEG_LEN		16777215
609

610
#define ISCSI_DEF_FIRST_BURST_LEN		65536
611
#define ISCSI_MIN_FIRST_BURST_LEN		512
612
#define ISCSI_MAX_FIRST_BURST_LEN		16777215
613

614
#define ISCSI_DEF_MAX_BURST_LEN			262144
615
#define ISCSI_MIN_MAX_BURST_LEN			512
616
#define ISCSI_MAX_MAX_BURST_LEN			16777215
617

618
#define ISCSI_DEF_TIME2WAIT			2
619

620
/************************* RFC 3720 End *****************************/
621

622
#endif /* ISCSI_PROTO_H */
623

624
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