658 lines
16 KiB
C
658 lines
16 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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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 open-iscsi@googlegroups.com
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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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/* iSCSI header length */
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#define ISCSI_HDR_LEN 48
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/* iSCSI CRC32C length */
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#define ISCSI_CRC_LEN 4
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/* Padding word length */
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#define ISCSI_PAD_LEN 4
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/*
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* Serial Number Arithmetic, 32 bits, RFC1982
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*/
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static inline int iscsi_sna_lt(u32 n1, u32 n2)
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{
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return (s32)(n1 - n2) < 0;
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}
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static inline int iscsi_sna_lte(u32 n1, u32 n2)
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{
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return (s32)(n1 - n2) <= 0;
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}
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static inline int iscsi_sna_gt(u32 n1, u32 n2)
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{
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return (s32)(n1 - n2) > 0;
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}
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static inline int iscsi_sna_gte(u32 n1, u32 n2)
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{
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return (s32)(n1 - n2) >= 0;
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}
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/*
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* useful common(control and data paths) 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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struct scsi_lun lun;
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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_scsi_req {
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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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struct scsi_lun lun;
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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_scsi_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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struct scsi_lun lun;
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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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struct scsi_lun lun;
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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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struct scsi_lun lun;
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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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struct scsi_lun lun;
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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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struct scsi_lun lun;
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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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struct scsi_lun lun;
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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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struct scsi_lun lun;
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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_req {
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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_CURRENT_STAGE1 0x04
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#define ISCSI_FLAG_LOGIN_CURRENT_STAGE2 0x08
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#define ISCSI_FLAG_LOGIN_CURRENT_STAGE3 0x0C
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#define ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK 0x03 /* 2 bits */
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#define ISCSI_FLAG_LOGIN_NEXT_STAGE1 0x01
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#define ISCSI_FLAG_LOGIN_NEXT_STAGE2 0x02
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#define ISCSI_FLAG_LOGIN_NEXT_STAGE3 0x03
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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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};
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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
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/* Login Status response classes */
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#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
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/* Class-1 (Redirection) */
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#define ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP 0x01
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#define ISCSI_LOGIN_STATUS_TGT_MOVED_PERM 0x02
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/* Class-2 (Initiator Error) */
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#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
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/* Class-3 (Target Error) */
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#define ISCSI_LOGIN_STATUS_TARGET_ERROR 0x00
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#define ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE 0x01
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#define ISCSI_LOGIN_STATUS_NO_RESOURCES 0x02
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/* Logout Header */
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struct iscsi_logout {
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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 rsvd2[8];
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itt_t itt; /* Initiator Task Tag */
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__be16 cid;
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uint8_t rsvd3[2];
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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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/* Logout PDU flags */
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#define ISCSI_FLAG_LOGOUT_REASON_MASK 0x7F
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/* logout reason_code values */
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#define ISCSI_LOGOUT_REASON_CLOSE_SESSION 0
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#define ISCSI_LOGOUT_REASON_CLOSE_CONNECTION 1
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#define ISCSI_LOGOUT_REASON_RECOVERY 2
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#define ISCSI_LOGOUT_REASON_AEN_REQUEST 3
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/* Logout Response Header */
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struct iscsi_logout_rsp {
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uint8_t opcode;
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uint8_t flags;
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uint8_t response; /* see Logout response values below */
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uint8_t rsvd2;
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uint8_t hlength;
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uint8_t dlength[3];
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uint8_t rsvd3[8];
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itt_t itt; /* Initiator Task Tag */
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__be32 rsvd4;
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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 rsvd5;
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__be16 t2wait;
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__be16 t2retain;
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__be32 rsvd6;
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};
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/* logout response status values */
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#define ISCSI_LOGOUT_SUCCESS 0
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#define ISCSI_LOGOUT_CID_NOT_FOUND 1
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#define ISCSI_LOGOUT_RECOVERY_UNSUPPORTED 2
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#define ISCSI_LOGOUT_CLEANUP_FAILED 3
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/* SNACK Header */
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struct iscsi_snack {
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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;
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__be32 ttt;
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uint8_t rsvd3[4];
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__be32 exp_statsn;
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uint8_t rsvd4[8];
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__be32 begrun;
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__be32 runlength;
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};
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/* SNACK PDU flags */
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#define ISCSI_FLAG_SNACK_TYPE_DATA 0
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#define ISCSI_FLAG_SNACK_TYPE_R2T 0
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#define ISCSI_FLAG_SNACK_TYPE_STATUS 1
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#define ISCSI_FLAG_SNACK_TYPE_DATA_ACK 2
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#define ISCSI_FLAG_SNACK_TYPE_RDATA 3
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#define ISCSI_FLAG_SNACK_TYPE_MASK 0x0F /* 4 bits */
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/* Reject Message Header */
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struct iscsi_reject {
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uint8_t opcode;
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uint8_t flags;
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uint8_t reason;
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uint8_t rsvd2;
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uint8_t hlength;
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uint8_t dlength[3];
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uint8_t rsvd3[8];
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__be32 ffffffff;
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uint8_t rsvd4[4];
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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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uint8_t rsvd5[8];
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/* Text - Rejected hdr */
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};
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/* Reason for Reject */
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#define ISCSI_REASON_CMD_BEFORE_LOGIN 1
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#define ISCSI_REASON_DATA_DIGEST_ERROR 2
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#define ISCSI_REASON_DATA_SNACK_REJECT 3
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#define ISCSI_REASON_PROTOCOL_ERROR 4
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#define ISCSI_REASON_CMD_NOT_SUPPORTED 5
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#define ISCSI_REASON_IMM_CMD_REJECT 6
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#define ISCSI_REASON_TASK_IN_PROGRESS 7
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#define ISCSI_REASON_INVALID_SNACK 8
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#define ISCSI_REASON_BOOKMARK_INVALID 9
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#define ISCSI_REASON_BOOKMARK_NO_RESOURCES 10
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#define ISCSI_REASON_NEGOTIATION_RESET 11
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/* Max. number of Key=Value pairs in a text message */
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#define MAX_KEY_VALUE_PAIRS 8192
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/* maximum length for text keys/values */
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#define KEY_MAXLEN 64
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#define VALUE_MAXLEN 255
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#define TARGET_NAME_MAXLEN VALUE_MAXLEN
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#define ISCSI_DEF_MAX_RECV_SEG_LEN 8192
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#define ISCSI_MIN_MAX_RECV_SEG_LEN 512
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#define ISCSI_MAX_MAX_RECV_SEG_LEN 16777215
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#define ISCSI_DEF_FIRST_BURST_LEN 65536
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#define ISCSI_MIN_FIRST_BURST_LEN 512
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#define ISCSI_MAX_FIRST_BURST_LEN 16777215
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#define ISCSI_DEF_MAX_BURST_LEN 262144
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#define ISCSI_MIN_MAX_BURST_LEN 512
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#define ISCSI_MAX_MAX_BURST_LEN 16777215
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#define ISCSI_DEF_TIME2WAIT 2
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#define ISCSI_NAME_LEN 224
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/************************* RFC 3720 End *****************************/
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#endif /* ISCSI_PROTO_H */
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