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  * (c) Copyright 2010-2013 Datera, Inc.
   8  *
   9  * Nicholas A. Bellinger <nab@linux-iscsi.org>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  24  *
  25  ******************************************************************************/
  26
  27 #include <linux/kernel.h>
  28 #include <linux/string.h>
  29 #include <linux/ctype.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/export.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_fabric.h>
  37 #include <target/target_core_configfs.h>
  38
  39 #include "target_core_internal.h"
  40 #include "target_core_pr.h"
  41
  42 /*
  43  * Handlers for Serial Attached SCSI (SAS)
  44  */
  45 u8 sas_get_fabric_proto_ident(struct se_portal_group *se_tpg)
  46 {
  47         /*
  48          * Return a SAS Serial SCSI Protocol identifier for loopback operations
  49          * This is defined in  section 7.5.1 Table 362 in spc4r17
  50          */
  51         return 0x6;
  52 }
  53 EXPORT_SYMBOL(sas_get_fabric_proto_ident);
  54
  55 u32 sas_get_pr_transport_id(
  56         struct se_portal_group *se_tpg,
  57         struct se_node_acl *se_nacl,
  58         struct t10_pr_registration *pr_reg,
  59         int *format_code,
  60         unsigned char *buf)
  61 {
  62         unsigned char *ptr;
  63         int ret;
  64
  65         /*
  66          * Set PROTOCOL IDENTIFIER to 6h for SAS
  67          */
  68         buf[0] = 0x06;
  69         /*
  70          * From spc4r17, 7.5.4.7 TransportID for initiator ports using SCSI
  71          * over SAS Serial SCSI Protocol
  72          */
  73         ptr = &se_nacl->initiatorname[4]; /* Skip over 'naa. prefix */
  74
  75         ret = hex2bin(&buf[4], ptr, 8);
  76         if (ret < 0)
  77                 pr_debug("sas transport_id: invalid hex string\n");
  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, ret;
 160         u32 off = 8;
 161
 162         /*
 163          * PROTOCOL IDENTIFIER is 0h for FCP-2
 164          *
 165          * From spc4r17, 7.5.4.2 TransportID for initiator ports using
 166          * SCSI over Fibre Channel
 167          *
 168          * We convert the ASCII formatted N Port name into a binary
 169          * encoded TransportID.
 170          */
 171         ptr = &se_nacl->initiatorname[0];
 172
 173         for (i = 0; i < 24; ) {
 174                 if (!strncmp(&ptr[i], ":", 1)) {
 175                         i++;
 176                         continue;
 177                 }
 178                 ret = hex2bin(&buf[off++], &ptr[i], 1);
 179                 if (ret < 0)
 180                         pr_debug("fc transport_id: invalid hex string\n");
 181                 i += 2;
 182         }
 183         /*
 184          * The FC Transport ID is a hardcoded 24-byte length
 185          */
 186         return 24;
 187 }
 188 EXPORT_SYMBOL(fc_get_pr_transport_id);
 189
 190 char *fc_parse_pr_out_transport_id(
 191         struct se_portal_group *se_tpg,
 192         const char *buf,
 193         u32 *out_tid_len,
 194         char **port_nexus_ptr)
 195 {
 196         /*
 197          * The TransportID for a FC N Port is of fixed size of
 198          * 24 bytes, and FC does not contain a I_T nexus identifier,
 199          * so we return the **port_nexus_ptr set to NULL.
 200          */
 201         *port_nexus_ptr = NULL;
 202         *out_tid_len = 24;
 203
 204          return (char *)&buf[8];
 205 }
 206 EXPORT_SYMBOL(fc_parse_pr_out_transport_id);
 207
 208 /*
 209  * Handlers for Internet Small Computer Systems Interface (iSCSI)
 210  */
 211
 212 u8 iscsi_get_fabric_proto_ident(struct se_portal_group *se_tpg)
 213 {
 214         /*
 215          * This value is defined for "Internet SCSI (iSCSI)"
 216          * in spc4r17 section 7.5.1 Table 362
 217          */
 218         return 0x5;
 219 }
 220 EXPORT_SYMBOL(iscsi_get_fabric_proto_ident);
 221
 222 u32 iscsi_get_pr_transport_id(
 223         struct se_portal_group *se_tpg,
 224         struct se_node_acl *se_nacl,
 225         struct t10_pr_registration *pr_reg,
 226         int *format_code,
 227         unsigned char *buf)
 228 {
 229         u32 off = 4, padding = 0;
 230         u16 len = 0;
 231
 232         spin_lock_irq(&se_nacl->nacl_sess_lock);
 233         /*
 234          * Set PROTOCOL IDENTIFIER to 5h for iSCSI
 235         */
 236         buf[0] = 0x05;
 237         /*
 238          * From spc4r17 Section 7.5.4.6: TransportID for initiator
 239          * ports using SCSI over iSCSI.
 240          *
 241          * The null-terminated, null-padded (see 4.4.2) ISCSI NAME field
 242          * shall contain the iSCSI name of an iSCSI initiator node (see
 243          * RFC 3720). The first ISCSI NAME field byte containing an ASCII
 244          * null character terminates the ISCSI NAME field without regard for
 245          * the specified length of the iSCSI TransportID or the contents of
 246          * the ADDITIONAL LENGTH field.
 247          */
 248         len = sprintf(&buf[off], "%s", se_nacl->initiatorname);
 249         /*
 250          * Add Extra byte for NULL terminator
 251          */
 252         len++;
 253         /*
 254          * If there is ISID present with the registration and *format code == 1
 255          * 1, use iSCSI Initiator port TransportID format.
 256          *
 257          * Otherwise use iSCSI Initiator device TransportID format that
 258          * does not contain the ASCII encoded iSCSI Initiator iSID value
 259          * provied by the iSCSi Initiator during the iSCSI login process.
 260          */
 261         if ((*format_code == 1) && (pr_reg->isid_present_at_reg)) {
 262                 /*
 263                  * Set FORMAT CODE 01b for iSCSI Initiator port TransportID
 264                  * format.
 265                  */
 266                 buf[0] |= 0x40;
 267                 /*
 268                  * From spc4r17 Section 7.5.4.6: TransportID for initiator
 269                  * ports using SCSI over iSCSI.  Table 390
 270                  *
 271                  * The SEPARATOR field shall contain the five ASCII
 272                  * characters ",i,0x".
 273                  *
 274                  * The null-terminated, null-padded ISCSI INITIATOR SESSION ID
 275                  * field shall contain the iSCSI initiator session identifier
 276                  * (see RFC 3720) in the form of ASCII characters that are the
 277                  * hexadecimal digits converted from the binary iSCSI initiator
 278                  * session identifier value. The first ISCSI INITIATOR SESSION
 279                  * ID field byte containing an ASCII null character
 280                  */
 281                 buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
 282                 buf[off+len] = 0x69; off++; /* ASCII Character: "i" */
 283                 buf[off+len] = 0x2c; off++; /* ASCII Character: "," */
 284                 buf[off+len] = 0x30; off++; /* ASCII Character: "0" */
 285                 buf[off+len] = 0x78; off++; /* ASCII Character: "x" */
 286                 len += 5;
 287                 buf[off+len] = pr_reg->pr_reg_isid[0]; off++;
 288                 buf[off+len] = pr_reg->pr_reg_isid[1]; off++;
 289                 buf[off+len] = pr_reg->pr_reg_isid[2]; off++;
 290                 buf[off+len] = pr_reg->pr_reg_isid[3]; off++;
 291                 buf[off+len] = pr_reg->pr_reg_isid[4]; off++;
 292                 buf[off+len] = pr_reg->pr_reg_isid[5]; off++;
 293                 buf[off+len] = '\0'; off++;
 294                 len += 7;
 295         }
 296         spin_unlock_irq(&se_nacl->nacl_sess_lock);
 297         /*
 298          * The ADDITIONAL LENGTH field specifies the number of bytes that follow
 299          * in the TransportID. The additional length shall be at least 20 and
 300          * shall be a multiple of four.
 301         */
 302         padding = ((-len) & 3);
 303         if (padding != 0)
 304                 len += padding;
 305
 306         buf[2] = ((len >> 8) & 0xff);
 307         buf[3] = (len & 0xff);
 308         /*
 309          * Increment value for total payload + header length for
 310          * full status descriptor
 311          */
 312         len += 4;
 313
 314         return len;
 315 }
 316 EXPORT_SYMBOL(iscsi_get_pr_transport_id);
 317
 318 u32 iscsi_get_pr_transport_id_len(
 319         struct se_portal_group *se_tpg,
 320         struct se_node_acl *se_nacl,
 321         struct t10_pr_registration *pr_reg,
 322         int *format_code)
 323 {
 324         u32 len = 0, padding = 0;
 325
 326         spin_lock_irq(&se_nacl->nacl_sess_lock);
 327         len = strlen(se_nacl->initiatorname);
 328         /*
 329          * Add extra byte for NULL terminator
 330          */
 331         len++;
 332         /*
 333          * If there is ISID present with the registration, use format code:
 334          * 01b: iSCSI Initiator port TransportID format
 335          *
 336          * If there is not an active iSCSI session, use format code:
 337          * 00b: iSCSI Initiator device TransportID format
 338          */
 339         if (pr_reg->isid_present_at_reg) {
 340                 len += 5; /* For ",i,0x" ASCII separator */
 341                 len += 7; /* For iSCSI Initiator Session ID + Null terminator */
 342                 *format_code = 1;
 343         } else
 344                 *format_code = 0;
 345         spin_unlock_irq(&se_nacl->nacl_sess_lock);
 346         /*
 347          * The ADDITIONAL LENGTH field specifies the number of bytes that follow
 348          * in the TransportID. The additional length shall be at least 20 and
 349          * shall be a multiple of four.
 350          */
 351         padding = ((-len) & 3);
 352         if (padding != 0)
 353                 len += padding;
 354         /*
 355          * Increment value for total payload + header length for
 356          * full status descriptor
 357          */
 358         len += 4;
 359
 360         return len;
 361 }
 362 EXPORT_SYMBOL(iscsi_get_pr_transport_id_len);
 363
 364 char *iscsi_parse_pr_out_transport_id(
 365         struct se_portal_group *se_tpg,
 366         const char *buf,
 367         u32 *out_tid_len,
 368         char **port_nexus_ptr)
 369 {
 370         char *p;
 371         u32 tid_len, padding;
 372         int i;
 373         u16 add_len;
 374         u8 format_code = (buf[0] & 0xc0);
 375         /*
 376          * Check for FORMAT CODE 00b or 01b from spc4r17, section 7.5.4.6:
 377          *
 378          *       TransportID for initiator ports using SCSI over iSCSI,
 379          *       from Table 388 -- iSCSI TransportID formats.
 380          *
 381          *    00b     Initiator port is identified using the world wide unique
 382          *            SCSI device name of the iSCSI initiator
 383          *            device containing the initiator port (see table 389).
 384          *    01b     Initiator port is identified using the world wide unique
 385          *            initiator port identifier (see table 390).10b to 11b
 386          *            Reserved
 387          */
 388         if ((format_code != 0x00) && (format_code != 0x40)) {
 389                 pr_err("Illegal format code: 0x%02x for iSCSI"
 390                         " Initiator Transport ID\n", format_code);
 391                 return NULL;
 392         }
 393         /*
 394          * If the caller wants the TransportID Length, we set that value for the
 395          * entire iSCSI Tarnsport ID now.
 396          */
 397         if (out_tid_len) {
 398                 /* The shift works thanks to integer promotion rules */
 399                 add_len = (buf[2] << 8) | buf[3];
 400
 401                 tid_len = strlen(&buf[4]);
 402                 tid_len += 4; /* Add four bytes for iSCSI Transport ID header */
 403                 tid_len += 1; /* Add one byte for NULL terminator */
 404                 padding = ((-tid_len) & 3);
 405                 if (padding != 0)
 406                         tid_len += padding;
 407
 408                 if ((add_len + 4) != tid_len) {
 409                         pr_debug("LIO-Target Extracted add_len: %hu "
 410                                 "does not match calculated tid_len: %u,"
 411                                 " using tid_len instead\n", add_len+4, tid_len);
 412                         *out_tid_len = tid_len;
 413                 } else
 414                         *out_tid_len = (add_len + 4);
 415         }
 416         /*
 417          * Check for ',i,0x' separator between iSCSI Name and iSCSI Initiator
 418          * Session ID as defined in Table 390 - iSCSI initiator port TransportID
 419          * format.
 420          */
 421         if (format_code == 0x40) {
 422                 p = strstr(&buf[4], ",i,0x");
 423                 if (!p) {
 424                         pr_err("Unable to locate \",i,0x\" separator"
 425                                 " for Initiator port identifier: %s\n",
 426                                 &buf[4]);
 427                         return NULL;
 428                 }
 429                 *p = '\0'; /* Terminate iSCSI Name */
 430                 p += 5; /* Skip over ",i,0x" separator */
 431
 432                 *port_nexus_ptr = p;
 433                 /*
 434                  * Go ahead and do the lower case conversion of the received
 435                  * 12 ASCII characters representing the ISID in the TransportID
 436                  * for comparison against the running iSCSI session's ISID from
 437                  * iscsi_target.c:lio_sess_get_initiator_sid()
 438                  */
 439                 for (i = 0; i < 12; i++) {
 440                         if (isdigit(*p)) {
 441                                 p++;
 442                                 continue;
 443                         }
 444                         *p = tolower(*p);
 445                         p++;
 446                 }
 447         }
 448
 449         return (char *)&buf[4];
 450 }
 451 EXPORT_SYMBOL(iscsi_parse_pr_out_transport_id);