Edit File: iscsi_proto.h
/* * 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 */