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