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_device.h>
  38 #include <target/target_core_transport.h>
  39 #include <target/target_core_fabric_lib.h>
  40 #include <target/target_core_fabric_ops.h>
  41 #include <target/target_core_configfs.h>
  42
  43 #include "target_core_hba.h"
  44 #include "target_core_pr.h"
  45
  46 /*
  47  * Handlers for Serial Attached SCSI (SAS)
  48  */
  49 u8 sas_get_fabric_proto_ident(struct se_portal_group *se_tpg)
  50 {
  51         /*
  52          * Return a SAS Serial SCSI Protocol identifier for loopback operations
  53          * This is defined in  section 7.5.1 Table 362 in spc4r17
  54          */
  55         return 0x6;
  56 }
  57 EXPORT_SYMBOL(sas_get_fabric_proto_ident);
  58
  59 u32 sas_get_pr_transport_id(
  60         struct se_portal_group *se_tpg,
  61         struct se_node_acl *se_nacl,
  62         struct t10_pr_registration *pr_reg,
  63         int *format_code,
  64         unsigned char *buf)
  65 {
  66         unsigned char *ptr;
  67         int ret;
  68
  69         /*
  70          * Set PROTOCOL IDENTIFIER to 6h for SAS
  71          */
  72         buf[0] = 0x06;
  73         /*
  74          * From spc4r17, 7.5.4.7 TransportID for initiator ports using SCSI
  75          * over SAS Serial SCSI Protocol
  76          */
  77         ptr = &se_nacl->initiatorname[4]; /* Skip over 'naa. prefix */
  78
  79         ret = hex2bin(&buf[4], ptr, 8);
  80         if (ret < 0)
  81                 pr_debug("sas transport_id: invalid hex string\n");
  82
  83         /*
  84          * The SAS Transport ID is a hardcoded 24-byte length
  85          */
  86         return 24;
  87 }
  88 EXPORT_SYMBOL(sas_get_pr_transport_id);
  89
  90 u32 sas_get_pr_transport_id_len(
  91         struct se_portal_group *se_tpg,
  92         struct se_node_acl *se_nacl,
  93         struct t10_pr_registration *pr_reg,
  94         int *format_code)
  95 {
  96         *format_code = 0;
  97         /*
  98          * From spc4r17, 7.5.4.7 TransportID for initiator ports using SCSI
  99          * over SAS Serial SCSI Protocol
 100          *
 101          * The SAS Transport ID is a hardcoded 24-byte length
 102          */
 103         return 24;
 104 }
 105 EXPORT_SYMBOL(sas_get_pr_transport_id_len);
 106
 107 /*
 108  * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above
 109  * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations.
 110  */
 111 char *sas_parse_pr_out_transport_id(
 112         struct se_portal_group *se_tpg,
 113         const char *buf,
 114         u32 *out_tid_len,
 115         char **port_nexus_ptr)
 116 {
 117         /*
 118          * Assume the FORMAT CODE 00b from spc4r17, 7.5.4.7 TransportID
 119          * for initiator ports using SCSI over SAS Serial SCSI Protocol
 120          *
 121          * The TransportID for a SAS Initiator Port is of fixed size of
 122          * 24 bytes, and SAS does not contain a I_T nexus identifier,
 123          * so we return the **port_nexus_ptr set to NULL.
 124          */
 125         *port_nexus_ptr = NULL;
 126         *out_tid_len = 24;
 127
 128         return (char *)&buf[4];
 129 }
 130 EXPORT_SYMBOL(sas_parse_pr_out_transport_id);
 131
 132 /*
 133  * Handlers for Fibre Channel Protocol (FCP)
 134  */
 135 u8 fc_get_fabric_proto_ident(struct se_portal_group *se_tpg)
 136 {
 137         return 0x0;     /* 0 = fcp-2 per SPC4 section 7.5.1 */
 138 }
 139 EXPORT_SYMBOL(fc_get_fabric_proto_ident);
 140
 141 u32 fc_get_pr_transport_id_len(
 142         struct se_portal_group *se_tpg,
 143         struct se_node_acl *se_nacl,
 144         struct t10_pr_registration *pr_reg,
 145         int *format_code)
 146 {
 147         *format_code = 0;
 148         /*
 149          * The FC Transport ID is a hardcoded 24-byte length
 150          */
 151         return 24;
 152 }
 153 EXPORT_SYMBOL(fc_get_pr_transport_id_len);
 154
 155 u32 fc_get_pr_transport_id(
 156         struct se_portal_group *se_tpg,
 157         struct se_node_acl *se_nacl,
 158         struct t10_pr_registration *pr_reg,
 159         int *format_code,
 160         unsigned char *buf)
 161 {
 162         unsigned char *ptr;
 163         int i, ret;
 164         u32 off = 8;
 165
 166         /*
 167          * PROTOCOL IDENTIFIER is 0h for FCP-2
 168          *
 169          * From spc4r17, 7.5.4.2 TransportID for initiator ports using
 170          * SCSI over Fibre Channel
 171          *
 172          * We convert the ASCII formatted N Port name into a binary
 173          * encoded TransportID.
 174          */
 175         ptr = &se_nacl->initiatorname[0];
 176
 177         for (i = 0; i < 24; ) {
 178                 if (!strncmp(&ptr[i], ":", 1)) {
 179                         i++;
 180                         continue;
 181                 }
 182                 ret = hex2bin(&buf[off++], &ptr[i], 1);
 183                 if (ret < 0)
 184                         pr_debug("fc transport_id: invalid hex string\n");
 185                 i += 2;
 186         }
 187         /*
 188          * The FC Transport ID is a hardcoded 24-byte length
 189          */
 190         return 24;
 191 }
 192 EXPORT_SYMBOL(fc_get_pr_transport_id);
 193
 194 char *fc_parse_pr_out_transport_id(
 195         struct se_portal_group *se_tpg,
 196         const char *buf,
 197         u32 *out_tid_len,
 198         char **port_nexus_ptr)
 199 {
 200         /*
 201          * The TransportID for a FC N Port is of fixed size of
 202          * 24 bytes, and FC does not contain a I_T nexus identifier,
 203          * so we return the **port_nexus_ptr set to NULL.
 204          */
 205         *port_nexus_ptr = NULL;
 206         *out_tid_len = 24;
 207
 208          return (char *)&buf[8];
 209 }
 210 EXPORT_SYMBOL(fc_parse_pr_out_transport_id);
 211
 212 /*
 213  * Handlers for Internet Small Computer Systems Interface (iSCSI)
 214  */
 215
 216 u8 iscsi_get_fabric_proto_ident(struct se_portal_group *se_tpg)
 217 {
 218         /*
 219          * This value is defined for "Internet SCSI (iSCSI)"
 220          * in spc4r17 section 7.5.1 Table 362
 221          */
 222         return 0x5;
 223 }
 224 EXPORT_SYMBOL(iscsi_get_fabric_proto_ident);
 225
 226 u32 iscsi_get_pr_transport_id(
 227         struct se_portal_group *se_tpg,
 228         struct se_node_acl *se_nacl,
 229         struct t10_pr_registration *pr_reg,
 230         int *format_code,
 231         unsigned char *buf)
 232 {
 233         u32 off = 4, padding = 0;
 234         u16 len = 0;
 235
 236         spin_lock_irq(&se_nacl->nacl_sess_lock);
 237         /*
 238          * Set PROTOCOL IDENTIFIER to 5h for iSCSI
 239         */
 240         buf[0] = 0x05;
 241         /*
 242          * From spc4r17 Section 7.5.4.6: TransportID for initiator
 243          * ports using SCSI over iSCSI.
 244          *
 245          * The null-terminated, null-padded (see 4.4.2) ISCSI NAME field
 246          * shall contain the iSCSI name of an iSCSI initiator node (see
 247          * RFC 3720). The first ISCSI NAME field byte containing an ASCII
 248          * null character terminates the ISCSI NAME field without regard for
 249          * the specified length of the iSCSI TransportID or the contents of
 250          * the ADDITIONAL LENGTH field.
 251          */
 252         len = sprintf(&buf[off], "%s", se_nacl->initiatorname);
 253         /*
 254          * Add Extra byte for NULL terminator
 255          */
 256         len++;
 257         /*
 258          * If there is ISID present with the registration and *format code == 1
 259          * 1, use iSCSI Initiator port TransportID format.
 260          *
 261          * Otherwise use iSCSI Initiator device TransportID format that
 262          * does not contain the ASCII encoded iSCSI Initiator iSID value
 263          * provied by the iSCSi Initiator during the iSCSI login process.
 264          */
 265         if ((*format_code == 1) && (pr_reg->isid_present_at_reg)) {
 266                 /*
 267                  * Set FORMAT CODE 01b for iSCSI Initiator port TransportID
 268                  * format.
 269                  */
 270                 buf[0] |= 0x40;
 271                 /*
 272                  * From spc4r17 Section 7.5.4.6: TransportID for initiator
 273                  * ports using SCSI over iSCSI.  Table 390
 274                  *
 275                  * The SEPARATOR field shall contain the five ASCII
 276                  * characters ",i,0x".
 277                  *
 278                  * The null-terminated, null-padded ISCSI INITIATOR SESSION ID
 279                  * field shall contain the iSCSI initiator session identifier
 280                  * (see RFC 3720) in the form of ASCII characters that are the
 281                  * hexadecimal digits converted from the binary iSCSI initiator
 282                  * session identifier value. The first ISCSI INITIATOR SESSION
 283                  * ID field byte containing an ASCII null character
 284                  */
 285                 buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
 286                 buf[off+len] = 0x69; off++; /* ASCII Character: "i" */
 287                 buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
 288                 buf[off+len] = 0x30; off++; /* ASCII Character: "0" */
 289                 buf[off+len] = 0x78; off++; /* ASCII Character: "x" */
 290                 len += 5;
 291                 buf[off+len] = pr_reg->pr_reg_isid[0]; off++;
 292                 buf[off+len] = pr_reg->pr_reg_isid[1]; off++;
 293                 buf[off+len] = pr_reg->pr_reg_isid[2]; off++;
 294                 buf[off+len] = pr_reg->pr_reg_isid[3]; off++;
 295                 buf[off+len] = pr_reg->pr_reg_isid[4]; off++;
 296                 buf[off+len] = pr_reg->pr_reg_isid[5]; off++;
 297                 buf[off+len] = '\0'; off++;
 298                 len += 7;
 299         }
 300         spin_unlock_irq(&se_nacl->nacl_sess_lock);
 301         /*
 302          * The ADDITIONAL LENGTH field specifies the number of bytes that follow
 303          * in the TransportID. The additional length shall be at least 20 and
 304          * shall be a multiple of four.
 305         */
 306         padding = ((-len) & 3);
 307         if (padding != 0)
 308                 len += padding;
 309
 310         buf[2] = ((len >> 8) & 0xff);
 311         buf[3] = (len & 0xff);
 312         /*
 313          * Increment value for total payload + header length for
 314          * full status descriptor
 315          */
 316         len += 4;
 317
 318         return len;
 319 }
 320 EXPORT_SYMBOL(iscsi_get_pr_transport_id);
 321
 322 u32 iscsi_get_pr_transport_id_len(
 323         struct se_portal_group *se_tpg,
 324         struct se_node_acl *se_nacl,
 325         struct t10_pr_registration *pr_reg,
 326         int *format_code)
 327 {
 328         u32 len = 0, padding = 0;
 329
 330         spin_lock_irq(&se_nacl->nacl_sess_lock);
 331         len = strlen(se_nacl->initiatorname);
 332         /*
 333          * Add extra byte for NULL terminator
 334          */
 335         len++;
 336         /*
 337          * If there is ISID present with the registration, use format code:
 338          * 01b: iSCSI Initiator port TransportID format
 339          *
 340          * If there is not an active iSCSI session, use format code:
 341          * 00b: iSCSI Initiator device TransportID format
 342          */
 343         if (pr_reg->isid_present_at_reg) {
 344                 len += 5; /* For ",i,0x" ASCII seperator */
 345                 len += 7; /* For iSCSI Initiator Session ID + Null terminator */
 346                 *format_code = 1;
 347         } else
 348                 *format_code = 0;
 349         spin_unlock_irq(&se_nacl->nacl_sess_lock);
 350         /*
 351          * The ADDITIONAL LENGTH field specifies the number of bytes that follow
 352          * in the TransportID. The additional length shall be at least 20 and
 353          * shall be a multiple of four.
 354          */
 355         padding = ((-len) & 3);
 356         if (padding != 0)
 357                 len += padding;
 358         /*
 359          * Increment value for total payload + header length for
 360          * full status descriptor
 361          */
 362         len += 4;
 363
 364         return len;
 365 }
 366 EXPORT_SYMBOL(iscsi_get_pr_transport_id_len);
 367
 368 char *iscsi_parse_pr_out_transport_id(
 369         struct se_portal_group *se_tpg,
 370         const char *buf,
 371         u32 *out_tid_len,
 372         char **port_nexus_ptr)
 373 {
 374         char *p;
 375         u32 tid_len, padding;
 376         int i;
 377         u16 add_len;
 378         u8 format_code = (buf[0] & 0xc0);
 379         /*
 380          * Check for FORMAT CODE 00b or 01b from spc4r17, section 7.5.4.6:
 381          *
 382          *       TransportID for initiator ports using SCSI over iSCSI,
 383          *       from Table 388 -- iSCSI TransportID formats.
 384          *
 385          *    00b     Initiator port is identified using the world wide unique
 386          *            SCSI device name of the iSCSI initiator
 387          *            device containing the initiator port (see table 389).
 388          *    01b     Initiator port is identified using the world wide unique
 389          *            initiator port identifier (see table 390).10b to 11b
 390          *            Reserved
 391          */
 392         if ((format_code != 0x00) && (format_code != 0x40)) {
 393                 pr_err("Illegal format code: 0x%02x for iSCSI"
 394                         " Initiator Transport ID\n", format_code);
 395                 return NULL;
 396         }
 397         /*
 398          * If the caller wants the TransportID Length, we set that value for the
 399          * entire iSCSI Tarnsport ID now.
 400          */
 401          if (out_tid_len != NULL) {
 402                 add_len = ((buf[2] >> 8) & 0xff);
 403                 add_len |= (buf[3] & 0xff);
 404
 405                 tid_len = strlen((char *)&buf[4]);
 406                 tid_len += 4; /* Add four bytes for iSCSI Transport ID header */
 407                 tid_len += 1; /* Add one byte for NULL terminator */
 408                 padding = ((-tid_len) & 3);
 409                 if (padding != 0)
 410                         tid_len += padding;
 411
 412                 if ((add_len + 4) != tid_len) {
 413                         pr_debug("LIO-Target Extracted add_len: %hu "
 414                                 "does not match calculated tid_len: %u,"
 415                                 " using tid_len instead\n", add_len+4, tid_len);
 416                         *out_tid_len = tid_len;
 417                 } else
 418                         *out_tid_len = (add_len + 4);
 419         }
 420         /*
 421          * Check for ',i,0x' seperator between iSCSI Name and iSCSI Initiator
 422          * Session ID as defined in Table 390 - iSCSI initiator port TransportID
 423          * format.
 424          */
 425         if (format_code == 0x40) {
 426                 p = strstr((char *)&buf[4], ",i,0x");
 427                 if (!p) {
 428                         pr_err("Unable to locate \",i,0x\" seperator"
 429                                 " for Initiator port identifier: %s\n",
 430                                 (char *)&buf[4]);
 431                         return NULL;
 432                 }
 433                 *p = '\0'; /* Terminate iSCSI Name */
 434                 p += 5; /* Skip over ",i,0x" seperator */
 435
 436                 *port_nexus_ptr = p;
 437                 /*
 438                  * Go ahead and do the lower case conversion of the received
 439                  * 12 ASCII characters representing the ISID in the TransportID
 440                  * for comparison against the running iSCSI session's ISID from
 441                  * iscsi_target.c:lio_sess_get_initiator_sid()
 442                  */
 443                 for (i = 0; i < 12; i++) {
 444                         if (isdigit(*p)) {
 445                                 p++;
 446                                 continue;
 447                         }
 448                         *p = tolower(*p);
 449                         p++;
 450                 }
 451         }
 452
 453         return (char *)&buf[4];
 454 }
 455 EXPORT_SYMBOL(iscsi_parse_pr_out_transport_id);