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 <linux/export.h>
  33 #include <scsi/scsi.h>
  34 #include <scsi/scsi_cmnd.h>
  35
  36 #include <target/target_core_base.h>
  37 #include <target/target_core_fabric.h>
  38 #include <target/target_core_configfs.h>
  39
  40 #include "target_core_internal.h"
  41 #include "target_core_pr.h"
  42
  43 /*
  44  * Handlers for Serial Attached SCSI (SAS)
  45  */
  46 u8 sas_get_fabric_proto_ident(struct se_portal_group *se_tpg)
  47 {
  48         /*
  49          * Return a SAS Serial SCSI Protocol identifier for loopback operations
  50          * This is defined in  section 7.5.1 Table 362 in spc4r17
  51          */
  52         return 0x6;
  53 }
  54 EXPORT_SYMBOL(sas_get_fabric_proto_ident);
  55
  56 u32 sas_get_pr_transport_id(
  57         struct se_portal_group *se_tpg,
  58         struct se_node_acl *se_nacl,
  59         struct t10_pr_registration *pr_reg,
  60         int *format_code,
  61         unsigned char *buf)
  62 {
  63         unsigned char *ptr;
  64         int ret;
  65
  66         /*
  67          * Set PROTOCOL IDENTIFIER to 6h for SAS
  68          */
  69         buf[0] = 0x06;
  70         /*
  71          * From spc4r17, 7.5.4.7 TransportID for initiator ports using SCSI
  72          * over SAS Serial SCSI Protocol
  73          */
  74         ptr = &se_nacl->initiatorname[4]; /* Skip over 'naa. prefix */
  75
  76         ret = hex2bin(&buf[4], ptr, 8);
  77         if (ret < 0)
  78                 pr_debug("sas transport_id: invalid hex string\n");
  79
  80         /*
  81          * The SAS Transport ID is a hardcoded 24-byte length
  82          */
  83         return 24;
  84 }
  85 EXPORT_SYMBOL(sas_get_pr_transport_id);
  86
  87 u32 sas_get_pr_transport_id_len(
  88         struct se_portal_group *se_tpg,
  89         struct se_node_acl *se_nacl,
  90         struct t10_pr_registration *pr_reg,
  91         int *format_code)
  92 {
  93         *format_code = 0;
  94         /*
  95          * From spc4r17, 7.5.4.7 TransportID for initiator ports using SCSI
  96          * over SAS Serial SCSI Protocol
  97          *
  98          * The SAS Transport ID is a hardcoded 24-byte length
  99          */
 100         return 24;
 101 }
 102 EXPORT_SYMBOL(sas_get_pr_transport_id_len);
 103
 104 /*
 105  * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
 106  * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
 107  */
 108 char *sas_parse_pr_out_transport_id(
 109         struct se_portal_group *se_tpg,
 110         const char *buf,
 111         u32 *out_tid_len,
 112         char **port_nexus_ptr)
 113 {
 114         /*
 115          * Assume the FORMAT CODE 00b from spc4r17, 7.5.4.7 TransportID
 116          * for initiator ports using SCSI over SAS Serial SCSI Protocol
 117          *
 118          * The TransportID for a SAS Initiator Port is of fixed size of
 119          * 24 bytes, and SAS does not contain a I_T nexus identifier,
 120          * so we return the **port_nexus_ptr set to NULL.
 121          */
 122         *port_nexus_ptr = NULL;
 123         *out_tid_len = 24;
 124
 125         return (char *)&buf[4];
 126 }
 127 EXPORT_SYMBOL(sas_parse_pr_out_transport_id);
 128
 129 /*
 130  * Handlers for Fibre Channel Protocol (FCP)
 131  */
 132 u8 fc_get_fabric_proto_ident(struct se_portal_group *se_tpg)
 133 {
 134         return 0x0;     /* 0 = fcp-2 per SPC4 section 7.5.1 */
 135 }
 136 EXPORT_SYMBOL(fc_get_fabric_proto_ident);
 137
 138 u32 fc_get_pr_transport_id_len(
 139         struct se_portal_group *se_tpg,
 140         struct se_node_acl *se_nacl,
 141         struct t10_pr_registration *pr_reg,
 142         int *format_code)
 143 {
 144         *format_code = 0;
 145         /*
 146          * The FC Transport ID is a hardcoded 24-byte length
 147          */
 148         return 24;
 149 }
 150 EXPORT_SYMBOL(fc_get_pr_transport_id_len);
 151
 152 u32 fc_get_pr_transport_id(
 153         struct se_portal_group *se_tpg,
 154         struct se_node_acl *se_nacl,
 155         struct t10_pr_registration *pr_reg,
 156         int *format_code,
 157         unsigned char *buf)
 158 {
 159         unsigned char *ptr;
 160         int i, ret;
 161         u32 off = 8;
 162
 163         /*
 164          * PROTOCOL IDENTIFIER is 0h for FCP-2
 165          *
 166          * From spc4r17, 7.5.4.2 TransportID for initiator ports using
 167          * SCSI over Fibre Channel
 168          *
 169          * We convert the ASCII formatted N Port name into a binary
 170          * encoded TransportID.
 171          */
 172         ptr = &se_nacl->initiatorname[0];
 173
 174         for (i = 0; i < 24; ) {
 175                 if (!strncmp(&ptr[i], ":", 1)) {
 176                         i++;
 177                         continue;
 178                 }
 179                 ret = hex2bin(&buf[off++], &ptr[i], 1);
 180                 if (ret < 0)
 181                         pr_debug("fc transport_id: invalid hex string\n");
 182                 i += 2;
 183         }
 184         /*
 185          * The FC Transport ID is a hardcoded 24-byte length
 186          */
 187         return 24;
 188 }
 189 EXPORT_SYMBOL(fc_get_pr_transport_id);
 190
 191 char *fc_parse_pr_out_transport_id(
 192         struct se_portal_group *se_tpg,
 193         const char *buf,
 194         u32 *out_tid_len,
 195         char **port_nexus_ptr)
 196 {
 197         /*
 198          * The TransportID for a FC N Port is of fixed size of
 199          * 24 bytes, and FC does not contain a I_T nexus identifier,
 200          * so we return the **port_nexus_ptr set to NULL.
 201          */
 202         *port_nexus_ptr = NULL;
 203         *out_tid_len = 24;
 204
 205          return (char *)&buf[8];
 206 }
 207 EXPORT_SYMBOL(fc_parse_pr_out_transport_id);
 208
 209 /*
 210  * Handlers for Internet Small Computer Systems Interface (iSCSI)
 211  */
 212
 213 u8 iscsi_get_fabric_proto_ident(struct se_portal_group *se_tpg)
 214 {
 215         /*
 216          * This value is defined for "Internet SCSI (iSCSI)"
 217          * in spc4r17 section 7.5.1 Table 362
 218          */
 219         return 0x5;
 220 }
 221 EXPORT_SYMBOL(iscsi_get_fabric_proto_ident);
 222
 223 u32 iscsi_get_pr_transport_id(
 224         struct se_portal_group *se_tpg,
 225         struct se_node_acl *se_nacl,
 226         struct t10_pr_registration *pr_reg,
 227         int *format_code,
 228         unsigned char *buf)
 229 {
 230         u32 off = 4, padding = 0;
 231         u16 len = 0;
 232
 233         spin_lock_irq(&se_nacl->nacl_sess_lock);
 234         /*
 235          * Set PROTOCOL IDENTIFIER to 5h for iSCSI
 236         */
 237         buf[0] = 0x05;
 238         /*
 239          * From spc4r17 Section 7.5.4.6: TransportID for initiator
 240          * ports using SCSI over iSCSI.
 241          *
 242          * The null-terminated, null-padded (see 4.4.2) ISCSI NAME field
 243          * shall contain the iSCSI name of an iSCSI initiator node (see
 244          * RFC 3720). The first ISCSI NAME field byte containing an ASCII
 245          * null character terminates the ISCSI NAME field without regard for
 246          * the specified length of the iSCSI TransportID or the contents of
 247          * the ADDITIONAL LENGTH field.
 248          */
 249         len = sprintf(&buf[off], "%s", se_nacl->initiatorname);
 250         /*
 251          * Add Extra byte for NULL terminator
 252          */
 253         len++;
 254         /*
 255          * If there is ISID present with the registration and *format code == 1
 256          * 1, use iSCSI Initiator port TransportID format.
 257          *
 258          * Otherwise use iSCSI Initiator device TransportID format that
 259          * does not contain the ASCII encoded iSCSI Initiator iSID value
 260          * provied by the iSCSi Initiator during the iSCSI login process.
 261          */
 262         if ((*format_code == 1) && (pr_reg->isid_present_at_reg)) {
 263                 /*
 264                  * Set FORMAT CODE 01b for iSCSI Initiator port TransportID
 265                  * format.
 266                  */
 267                 buf[0] |= 0x40;
 268                 /*
 269                  * From spc4r17 Section 7.5.4.6: TransportID for initiator
 270                  * ports using SCSI over iSCSI.  Table 390
 271                  *
 272                  * The SEPARATOR field shall contain the five ASCII
 273                  * characters ",i,0x".
 274                  *
 275                  * The null-terminated, null-padded ISCSI INITIATOR SESSION ID
 276                  * field shall contain the iSCSI initiator session identifier
 277                  * (see RFC 3720) in the form of ASCII characters that are the
 278                  * hexadecimal digits converted from the binary iSCSI initiator
 279                  * session identifier value. The first ISCSI INITIATOR SESSION
 280                  * ID field byte containing an ASCII null character
 281                  */
 282                 buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
 283                 buf[off+len] = 0x69; off++; /* ASCII Character: "i" */
 284                 buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
 285                 buf[off+len] = 0x30; off++; /* ASCII Character: "0" */
 286                 buf[off+len] = 0x78; off++; /* ASCII Character: "x" */
 287                 len += 5;
 288                 buf[off+len] = pr_reg->pr_reg_isid[0]; off++;
 289                 buf[off+len] = pr_reg->pr_reg_isid[1]; off++;
 290                 buf[off+len] = pr_reg->pr_reg_isid[2]; off++;
 291                 buf[off+len] = pr_reg->pr_reg_isid[3]; off++;
 292                 buf[off+len] = pr_reg->pr_reg_isid[4]; off++;
 293                 buf[off+len] = pr_reg->pr_reg_isid[5]; off++;
 294                 buf[off+len] = '\0'; off++;
 295                 len += 7;
 296         }
 297         spin_unlock_irq(&se_nacl->nacl_sess_lock);
 298         /*
 299          * The ADDITIONAL LENGTH field specifies the number of bytes that follow
 300          * in the TransportID. The additional length shall be at least 20 and
 301          * shall be a multiple of four.
 302         */
 303         padding = ((-len) & 3);
 304         if (padding != 0)
 305                 len += padding;
 306
 307         buf[2] = ((len >> 8) & 0xff);
 308         buf[3] = (len & 0xff);
 309         /*
 310          * Increment value for total payload + header length for
 311          * full status descriptor
 312          */
 313         len += 4;
 314
 315         return len;
 316 }
 317 EXPORT_SYMBOL(iscsi_get_pr_transport_id);
 318
 319 u32 iscsi_get_pr_transport_id_len(
 320         struct se_portal_group *se_tpg,
 321         struct se_node_acl *se_nacl,
 322         struct t10_pr_registration *pr_reg,
 323         int *format_code)
 324 {
 325         u32 len = 0, padding = 0;
 326
 327         spin_lock_irq(&se_nacl->nacl_sess_lock);
 328         len = strlen(se_nacl->initiatorname);
 329         /*
 330          * Add extra byte for NULL terminator
 331          */
 332         len++;
 333         /*
 334          * If there is ISID present with the registration, use format code:
 335          * 01b: iSCSI Initiator port TransportID format
 336          *
 337          * If there is not an active iSCSI session, use format code:
 338          * 00b: iSCSI Initiator device TransportID format
 339          */
 340         if (pr_reg->isid_present_at_reg) {
 341                 len += 5; /* For ",i,0x" ASCII seperator */
 342                 len += 7; /* For iSCSI Initiator Session ID + Null terminator */
 343                 *format_code = 1;
 344         } else
 345                 *format_code = 0;
 346         spin_unlock_irq(&se_nacl->nacl_sess_lock);
 347         /*
 348          * The ADDITIONAL LENGTH field specifies the number of bytes that follow
 349          * in the TransportID. The additional length shall be at least 20 and
 350          * shall be a multiple of four.
 351          */
 352         padding = ((-len) & 3);
 353         if (padding != 0)
 354                 len += padding;
 355         /*
 356          * Increment value for total payload + header length for
 357          * full status descriptor
 358          */
 359         len += 4;
 360
 361         return len;
 362 }
 363 EXPORT_SYMBOL(iscsi_get_pr_transport_id_len);
 364
 365 char *iscsi_parse_pr_out_transport_id(
 366         struct se_portal_group *se_tpg,
 367         const char *buf,
 368         u32 *out_tid_len,
 369         char **port_nexus_ptr)
 370 {
 371         char *p;
 372         u32 tid_len, padding;
 373         int i;
 374         u16 add_len;
 375         u8 format_code = (buf[0] & 0xc0);
 376         /*
 377          * Check for FORMAT CODE 00b or 01b from spc4r17, section 7.5.4.6:
 378          *
 379          *       TransportID for initiator ports using SCSI over iSCSI,
 380          *       from Table 388 -- iSCSI TransportID formats.
 381          *
 382          *    00b     Initiator port is identified using the world wide unique
 383          *            SCSI device name of the iSCSI initiator
 384          *            device containing the initiator port (see table 389).
 385          *    01b     Initiator port is identified using the world wide unique
 386          *            initiator port identifier (see table 390).10b to 11b
 387          *            Reserved
 388          */
 389         if ((format_code != 0x00) && (format_code != 0x40)) {
 390                 pr_err("Illegal format code: 0x%02x for iSCSI"
 391                         " Initiator Transport ID\n", format_code);
 392                 return NULL;
 393         }
 394         /*
 395          * If the caller wants the TransportID Length, we set that value for the
 396          * entire iSCSI Tarnsport ID now.
 397          */
 398          if (out_tid_len != NULL) {
 399                 add_len = ((buf[2] >> 8) & 0xff);
 400                 add_len |= (buf[3] & 0xff);
 401
 402                 tid_len = strlen(&buf[4]);
 403                 tid_len += 4; /* Add four bytes for iSCSI Transport ID header */
 404                 tid_len += 1; /* Add one byte for NULL terminator */
 405                 padding = ((-tid_len) & 3);
 406                 if (padding != 0)
 407                         tid_len += padding;
 408
 409                 if ((add_len + 4) != tid_len) {
 410                         pr_debug("LIO-Target Extracted add_len: %hu "
 411                                 "does not match calculated tid_len: %u,"
 412                                 " using tid_len instead\n", add_len+4, tid_len);
 413                         *out_tid_len = tid_len;
 414                 } else
 415                         *out_tid_len = (add_len + 4);
 416         }
 417         /*
 418          * Check for ',i,0x' seperator between iSCSI Name and iSCSI Initiator
 419          * Session ID as defined in Table 390 - iSCSI initiator port TransportID
 420          * format.
 421          */
 422         if (format_code == 0x40) {
 423                 p = strstr(&buf[4], ",i,0x");
 424                 if (!p) {
 425                         pr_err("Unable to locate \",i,0x\" seperator"
 426                                 " for Initiator port identifier: %s\n",
 427                                 &buf[4]);
 428                         return NULL;
 429                 }
 430                 *p = '\0'; /* Terminate iSCSI Name */
 431                 p += 5; /* Skip over ",i,0x" seperator */
 432
 433                 *port_nexus_ptr = p;
 434                 /*
 435                  * Go ahead and do the lower case conversion of the received
 436                  * 12 ASCII characters representing the ISID in the TransportID
 437                  * for comparison against the running iSCSI session's ISID from
 438                  * iscsi_target.c:lio_sess_get_initiator_sid()
 439                  */
 440                 for (i = 0; i < 12; i++) {
 441                         if (isdigit(*p)) {
 442                                 p++;
 443                                 continue;
 444                         }
 445                         *p = tolower(*p);
 446                         p++;
 447                 }
 448         }
 449
 450         return (char *)&buf[4];
 451 }
 452 EXPORT_SYMBOL(iscsi_parse_pr_out_transport_id);