drivers/target/target_core_fabric_lib.c

   1 /*******************************************************************************
   2  * Filename:  target_core_fabric_lib.c
   3  *
   4  * This file contains generic high level protocol identifier and PR
   5  * handlers for TCM fabric modules
   6  *
   7  * Copyright (c) 2010 Rising Tide Systems, Inc.
   8  * Copyright (c) 2010 Linux-iSCSI.org
   9  *
  10  * Nicholas A. Bellinger <nab@linux-iscsi.org>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  25  *
  26  ******************************************************************************/
  27
  28 #include <linux/kernel.h>
  29 #include <linux/string.h>
  30 #include <linux/ctype.h>
  31 #include <linux/spinlock.h>
  32 #include <scsi/scsi.h>
  33 #include <scsi/scsi_cmnd.h>
  34
  35 #include <target/target_core_base.h>
  36 #include <target/target_core_device.h>
  37 #include <target/target_core_transport.h>
  38 #include <target/target_core_fabric_lib.h>
  39 #include <target/target_core_fabric_ops.h>
  40 #include <target/target_core_configfs.h>
  41
  42 #include "target_core_hba.h"
  43 #include "target_core_pr.h"
  44
  45 /*
  46  * Handlers for Serial Attached SCSI (SAS)
  47  */
  48 u8 sas_get_fabric_proto_ident(struct se_portal_group *se_tpg)
  49 {
  50         /*
  51          * Return a SAS Serial SCSI Protocol identifier for loopback operations
  52          * This is defined in  section 7.5.1 Table 362 in spc4r17
  53          */
  54         return 0x6;
  55 }
  56 EXPORT_SYMBOL(sas_get_fabric_proto_ident);
  57
  58 u32 sas_get_pr_transport_id(
  59         struct se_portal_group *se_tpg,
  60         struct se_node_acl *se_nacl,
  61         struct t10_pr_registration *pr_reg,
  62         int *format_code,
  63         unsigned char *buf)
  64 {
  65         unsigned char *ptr;
  66
  67         /*
  68          * Set PROTOCOL IDENTIFIER to 6h for SAS
  69          */
  70         buf[0] = 0x06;
  71         /*
  72          * From spc4r17, 7.5.4.7 TransportID for initiator ports using SCSI
  73          * over SAS Serial SCSI Protocol
  74          */
  75         ptr = &se_nacl->initiatorname[4]; /* Skip over 'naa. prefix */
  76
  77         hex2bin(&buf[4], ptr, 8);
  78
  79         /*
  80          * The SAS Transport ID is a hardcoded 24-byte length
  81          */
  82         return 24;
  83 }
  84 EXPORT_SYMBOL(sas_get_pr_transport_id);
  85
  86 u32 sas_get_pr_transport_id_len(
  87         struct se_portal_group *se_tpg,
  88         struct se_node_acl *se_nacl,
  89         struct t10_pr_registration *pr_reg,
  90         int *format_code)
  91 {
  92         *format_code = 0;
  93         /*
  94          * From spc4r17, 7.5.4.7 TransportID for initiator ports using SCSI
  95          * over SAS Serial SCSI Protocol
  96          *
  97          * The SAS Transport ID is a hardcoded 24-byte length
  98          */
  99         return 24;
 100 }
 101 EXPORT_SYMBOL(sas_get_pr_transport_id_len);
 102
 103 /*
 104  * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
 105  * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
 106  */
 107 char *sas_parse_pr_out_transport_id(
 108         struct se_portal_group *se_tpg,
 109         const char *buf,
 110         u32 *out_tid_len,
 111         char **port_nexus_ptr)
 112 {
 113         /*
 114          * Assume the FORMAT CODE 00b from spc4r17, 7.5.4.7 TransportID
 115          * for initiator ports using SCSI over SAS Serial SCSI Protocol
 116          *
 117          * The TransportID for a SAS Initiator Port is of fixed size of
 118          * 24 bytes, and SAS does not contain a I_T nexus identifier,
 119          * so we return the **port_nexus_ptr set to NULL.
 120          */
 121         *port_nexus_ptr = NULL;
 122         *out_tid_len = 24;
 123
 124         return (char *)&buf[4];
 125 }
 126 EXPORT_SYMBOL(sas_parse_pr_out_transport_id);
 127
 128 /*
 129  * Handlers for Fibre Channel Protocol (FCP)
 130  */
 131 u8 fc_get_fabric_proto_ident(struct se_portal_group *se_tpg)
 132 {
 133         return 0x0;     /* 0 = fcp-2 per SPC4 section 7.5.1 */
 134 }
 135 EXPORT_SYMBOL(fc_get_fabric_proto_ident);
 136
 137 u32 fc_get_pr_transport_id_len(
 138         struct se_portal_group *se_tpg,
 139         struct se_node_acl *se_nacl,
 140         struct t10_pr_registration *pr_reg,
 141         int *format_code)
 142 {
 143         *format_code = 0;
 144         /*
 145          * The FC Transport ID is a hardcoded 24-byte length
 146          */
 147         return 24;
 148 }
 149 EXPORT_SYMBOL(fc_get_pr_transport_id_len);
 150
 151 u32 fc_get_pr_transport_id(
 152         struct se_portal_group *se_tpg,
 153         struct se_node_acl *se_nacl,
 154         struct t10_pr_registration *pr_reg,
 155         int *format_code,
 156         unsigned char *buf)
 157 {
 158         unsigned char *ptr;
 159         int i;
 160         u32 off = 8;
 161         /*
 162          * PROTOCOL IDENTIFIER is 0h for FCP-2
 163          *
 164          * From spc4r17, 7.5.4.2 TransportID for initiator ports using
 165          * SCSI over Fibre Channel
 166          *
 167          * We convert the ASCII formatted N Port name into a binary
 168          * encoded TransportID.
 169          */
 170         ptr = &se_nacl->initiatorname[0];
 171
 172         for (i = 0; i < 24; ) {
 173                 if (!strncmp(&ptr[i], ":", 1)) {
 174                         i++;
 175                         continue;
 176                 }
 177                 hex2bin(&buf[off++], &ptr[i], 1);
 178                 i += 2;
 179         }
 180         /*
 181          * The FC Transport ID is a hardcoded 24-byte length
 182          */
 183         return 24;
 184 }
 185 EXPORT_SYMBOL(fc_get_pr_transport_id);
 186
 187 char *fc_parse_pr_out_transport_id(
 188         struct se_portal_group *se_tpg,
 189         const char *buf,
 190         u32 *out_tid_len,
 191         char **port_nexus_ptr)
 192 {
 193         /*
 194          * The TransportID for a FC N Port is of fixed size of
 195          * 24 bytes, and FC does not contain a I_T nexus identifier,
 196          * so we return the **port_nexus_ptr set to NULL.
 197          */
 198         *port_nexus_ptr = NULL;
 199         *out_tid_len = 24;
 200
 201          return (char *)&buf[8];
 202 }
 203 EXPORT_SYMBOL(fc_parse_pr_out_transport_id);
 204
 205 /*
 206  * Handlers for Internet Small Computer Systems Interface (iSCSI)
 207  */
 208
 209 u8 iscsi_get_fabric_proto_ident(struct se_portal_group *se_tpg)
 210 {
 211         /*
 212          * This value is defined for "Internet SCSI (iSCSI)"
 213          * in spc4r17 section 7.5.1 Table 362
 214          */
 215         return 0x5;
 216 }
 217 EXPORT_SYMBOL(iscsi_get_fabric_proto_ident);
 218
 219 u32 iscsi_get_pr_transport_id(
 220         struct se_portal_group *se_tpg,
 221         struct se_node_acl *se_nacl,
 222         struct t10_pr_registration *pr_reg,
 223         int *format_code,
 224         unsigned char *buf)
 225 {
 226         u32 off = 4, padding = 0;
 227         u16 len = 0;
 228
 229         spin_lock_irq(&se_nacl->nacl_sess_lock);
 230         /*
 231          * Set PROTOCOL IDENTIFIER to 5h for iSCSI
 232         */
 233         buf[0] = 0x05;
 234         /*
 235          * From spc4r17 Section 7.5.4.6: TransportID for initiator
 236          * ports using SCSI over iSCSI.
 237          *
 238          * The null-terminated, null-padded (see 4.4.2) ISCSI NAME field
 239          * shall contain the iSCSI name of an iSCSI initiator node (see
 240          * RFC 3720). The first ISCSI NAME field byte containing an ASCII
 241          * null character terminates the ISCSI NAME field without regard for
 242          * the specified length of the iSCSI TransportID or the contents of
 243          * the ADDITIONAL LENGTH field.
 244          */
 245         len = sprintf(&buf[off], "%s", se_nacl->initiatorname);
 246         /*
 247          * Add Extra byte for NULL terminator
 248          */
 249         len++;
 250         /*
 251          * If there is ISID present with the registration and *format code == 1
 252          * 1, use iSCSI Initiator port TransportID format.
 253          *
 254          * Otherwise use iSCSI Initiator device TransportID format that
 255          * does not contain the ASCII encoded iSCSI Initiator iSID value
 256          * provied by the iSCSi Initiator during the iSCSI login process.
 257          */
 258         if ((*format_code == 1) && (pr_reg->isid_present_at_reg)) {
 259                 /*
 260                  * Set FORMAT CODE 01b for iSCSI Initiator port TransportID
 261                  * format.
 262                  */
 263                 buf[0] |= 0x40;
 264                 /*
 265                  * From spc4r17 Section 7.5.4.6: TransportID for initiator
 266                  * ports using SCSI over iSCSI.  Table 390
 267                  *
 268                  * The SEPARATOR field shall contain the five ASCII
 269                  * characters ",i,0x".
 270                  *
 271                  * The null-terminated, null-padded ISCSI INITIATOR SESSION ID
 272                  * field shall contain the iSCSI initiator session identifier
 273                  * (see RFC 3720) in the form of ASCII characters that are the
 274                  * hexadecimal digits converted from the binary iSCSI initiator
 275                  * session identifier value. The first ISCSI INITIATOR SESSION
 276                  * ID field byte containing an ASCII null character
 277                  */
 278                 buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
 279                 buf[off+len] = 0x69; off++; /* ASCII Character: "i" */
 280                 buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
 281                 buf[off+len] = 0x30; off++; /* ASCII Character: "0" */
 282                 buf[off+len] = 0x78; off++; /* ASCII Character: "x" */
 283                 len += 5;
 284                 buf[off+len] = pr_reg->pr_reg_isid[0]; off++;
 285                 buf[off+len] = pr_reg->pr_reg_isid[1]; off++;
 286                 buf[off+len] = pr_reg->pr_reg_isid[2]; off++;
 287                 buf[off+len] = pr_reg->pr_reg_isid[3]; off++;
 288                 buf[off+len] = pr_reg->pr_reg_isid[4]; off++;
 289                 buf[off+len] = pr_reg->pr_reg_isid[5]; off++;
 290                 buf[off+len] = '\0'; off++;
 291                 len += 7;
 292         }
 293         spin_unlock_irq(&se_nacl->nacl_sess_lock);
 294         /*
 295          * The ADDITIONAL LENGTH field specifies the number of bytes that follow
 296          * in the TransportID. The additional length shall be at least 20 and
 297          * shall be a multiple of four.
 298         */
 299         padding = ((-len) & 3);
 300         if (padding != 0)
 301                 len += padding;
 302
 303         buf[2] = ((len >> 8) & 0xff);
 304         buf[3] = (len & 0xff);
 305         /*
 306          * Increment value for total payload + header length for
 307          * full status descriptor
 308          */
 309         len += 4;
 310
 311         return len;
 312 }
 313 EXPORT_SYMBOL(iscsi_get_pr_transport_id);
 314
 315 u32 iscsi_get_pr_transport_id_len(
 316         struct se_portal_group *se_tpg,
 317         struct se_node_acl *se_nacl,
 318         struct t10_pr_registration *pr_reg,
 319         int *format_code)
 320 {
 321         u32 len = 0, padding = 0;
 322
 323         spin_lock_irq(&se_nacl->nacl_sess_lock);
 324         len = strlen(se_nacl->initiatorname);
 325         /*
 326          * Add extra byte for NULL terminator
 327          */
 328         len++;
 329         /*
 330          * If there is ISID present with the registration, use format code:
 331          * 01b: iSCSI Initiator port TransportID format
 332          *
 333          * If there is not an active iSCSI session, use format code:
 334          * 00b: iSCSI Initiator device TransportID format
 335          */
 336         if (pr_reg->isid_present_at_reg) {
 337                 len += 5; /* For ",i,0x" ASCII seperator */
 338                 len += 7; /* For iSCSI Initiator Session ID + Null terminator */
 339                 *format_code = 1;
 340         } else
 341                 *format_code = 0;
 342         spin_unlock_irq(&se_nacl->nacl_sess_lock);
 343         /*
 344          * The ADDITIONAL LENGTH field specifies the number of bytes that follow
 345          * in the TransportID. The additional length shall be at least 20 and
 346          * shall be a multiple of four.
 347          */
 348         padding = ((-len) & 3);
 349         if (padding != 0)
 350                 len += padding;
 351         /*
 352          * Increment value for total payload + header length for
 353          * full status descriptor
 354          */
 355         len += 4;
 356
 357         return len;
 358 }
 359 EXPORT_SYMBOL(iscsi_get_pr_transport_id_len);
 360
 361 char *iscsi_parse_pr_out_transport_id(
 362         struct se_portal_group *se_tpg,
 363         const char *buf,
 364         u32 *out_tid_len,
 365         char **port_nexus_ptr)
 366 {
 367         char *p;
 368         u32 tid_len, padding;
 369         int i;
 370         u16 add_len;
 371         u8 format_code = (buf[0] & 0xc0);
 372         /*
 373          * Check for FORMAT CODE 00b or 01b from spc4r17, section 7.5.4.6:
 374          *
 375          *       TransportID for initiator ports using SCSI over iSCSI,
 376          *       from Table 388 -- iSCSI TransportID formats.
 377          *
 378          *    00b     Initiator port is identified using the world wide unique
 379          *            SCSI device name of the iSCSI initiator
 380          *            device containing the initiator port (see table 389).
 381          *    01b     Initiator port is identified using the world wide unique
 382          *            initiator port identifier (see table 390).10b to 11b
 383          *            Reserved
 384          */
 385         if ((format_code != 0x00) && (format_code != 0x40)) {
 386                 pr_err("Illegal format code: 0x%02x for iSCSI"
 387                         " Initiator Transport ID\n", format_code);
 388                 return NULL;
 389         }
 390         /*
 391          * If the caller wants the TransportID Length, we set that value for the
 392          * entire iSCSI Tarnsport ID now.
 393          */
 394          if (out_tid_len != NULL) {
 395                 add_len = ((buf[2] >> 8) & 0xff);
 396                 add_len |= (buf[3] & 0xff);
 397
 398                 tid_len = strlen((char *)&buf[4]);
 399                 tid_len += 4; /* Add four bytes for iSCSI Transport ID header */
 400                 tid_len += 1; /* Add one byte for NULL terminator */
 401                 padding = ((-tid_len) & 3);
 402                 if (padding != 0)
 403                         tid_len += padding;
 404
 405                 if ((add_len + 4) != tid_len) {
 406                         pr_debug("LIO-Target Extracted add_len: %hu "
 407                                 "does not match calculated tid_len: %u,"
 408                                 " using tid_len instead\n", add_len+4, tid_len);
 409                         *out_tid_len = tid_len;
 410                 } else
 411                         *out_tid_len = (add_len + 4);
 412         }
 413         /*
 414          * Check for ',i,0x' seperator between iSCSI Name and iSCSI Initiator
 415          * Session ID as defined in Table 390 - iSCSI initiator port TransportID
 416          * format.
 417          */
 418         if (format_code == 0x40) {
 419                 p = strstr((char *)&buf[4], ",i,0x");
 420                 if (!p) {
 421                         pr_err("Unable to locate \",i,0x\" seperator"
 422                                 " for Initiator port identifier: %s\n",
 423                                 (char *)&buf[4]);
 424                         return NULL;
 425                 }
 426                 *p = '\0'; /* Terminate iSCSI Name */
 427                 p += 5; /* Skip over ",i,0x" seperator */
 428
 429                 *port_nexus_ptr = p;
 430                 /*
 431                  * Go ahead and do the lower case conversion of the received
 432                  * 12 ASCII characters representing the ISID in the TransportID
 433                  * for comparison against the running iSCSI session's ISID from
 434                  * iscsi_target.c:lio_sess_get_initiator_sid()
 435                  */
 436                 for (i = 0; i < 12; i++) {
 437                         if (isdigit(*p)) {
 438                                 p++;
 439                                 continue;
 440                         }
 441                         *p = tolower(*p);
 442                         p++;
 443                 }
 444         }
 445
 446         return (char *)&buf[4];
 447 }
 448 EXPORT_SYMBOL(iscsi_parse_pr_out_transport_id);