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/string.h> 29 #include <linux/ctype.h> 30 #include <linux/spinlock.h> 31 #include <scsi/scsi.h> 32 #include <scsi/scsi_cmnd.h> 33 34 #include <target/target_core_base.h> 35 #include <target/target_core_device.h> 36 #include <target/target_core_transport.h> 37 #include <target/target_core_fabric_lib.h> 38 #include <target/target_core_fabric_ops.h> 39 #include <target/target_core_configfs.h> 40 41 #include "target_core_hba.h" 42 #include "target_core_pr.h" 43 44 /* 45 * Handlers for Serial Attached SCSI (SAS) 46 */ 47 u8 sas_get_fabric_proto_ident(struct se_portal_group *se_tpg) 48 { 49 /* 50 * Return a SAS Serial SCSI Protocol identifier for loopback operations 51 * This is defined in section 7.5.1 Table 362 in spc4r17 52 */ 53 return 0x6; 54 } 55 EXPORT_SYMBOL(sas_get_fabric_proto_ident); 56 57 u32 sas_get_pr_transport_id( 58 struct se_portal_group *se_tpg, 59 struct se_node_acl *se_nacl, 60 struct t10_pr_registration *pr_reg, 61 int *format_code, 62 unsigned char *buf) 63 { 64 unsigned char binary, *ptr; 65 int i; 66 u32 off = 4; 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 for (i = 0; i < 16; i += 2) { 78 binary = transport_asciihex_to_binaryhex(&ptr[i]); 79 buf[off++] = binary; 80 } 81 /* 82 * The SAS Transport ID is a hardcoded 24-byte length 83 */ 84 return 24; 85 } 86 EXPORT_SYMBOL(sas_get_pr_transport_id); 87 88 u32 sas_get_pr_transport_id_len( 89 struct se_portal_group *se_tpg, 90 struct se_node_acl *se_nacl, 91 struct t10_pr_registration *pr_reg, 92 int *format_code) 93 { 94 *format_code = 0; 95 /* 96 * From spc4r17, 7.5.4.7 TransportID for initiator ports using SCSI 97 * over SAS Serial SCSI Protocol 98 * 99 * The SAS Transport ID is a hardcoded 24-byte length 100 */ 101 return 24; 102 } 103 EXPORT_SYMBOL(sas_get_pr_transport_id_len); 104 105 /* 106 * Used for handling SCSI fabric dependent TransportIDs in SPC-3 and above 107 * Persistent Reservation SPEC_I_PT=1 and PROUT REGISTER_AND_MOVE operations. 108 */ 109 char *sas_parse_pr_out_transport_id( 110 struct se_portal_group *se_tpg, 111 const char *buf, 112 u32 *out_tid_len, 113 char **port_nexus_ptr) 114 { 115 /* 116 * Assume the FORMAT CODE 00b from spc4r17, 7.5.4.7 TransportID 117 * for initiator ports using SCSI over SAS Serial SCSI Protocol 118 * 119 * The TransportID for a SAS Initiator Port is of fixed size of 120 * 24 bytes, and SAS does not contain a I_T nexus identifier, 121 * so we return the **port_nexus_ptr set to NULL. 122 */ 123 *port_nexus_ptr = NULL; 124 *out_tid_len = 24; 125 126 return (char *)&buf[4]; 127 } 128 EXPORT_SYMBOL(sas_parse_pr_out_transport_id); 129 130 /* 131 * Handlers for Fibre Channel Protocol (FCP) 132 */ 133 u8 fc_get_fabric_proto_ident(struct se_portal_group *se_tpg) 134 { 135 return 0x0; /* 0 = fcp-2 per SPC4 section 7.5.1 */ 136 } 137 EXPORT_SYMBOL(fc_get_fabric_proto_ident); 138 139 u32 fc_get_pr_transport_id_len( 140 struct se_portal_group *se_tpg, 141 struct se_node_acl *se_nacl, 142 struct t10_pr_registration *pr_reg, 143 int *format_code) 144 { 145 *format_code = 0; 146 /* 147 * The FC Transport ID is a hardcoded 24-byte length 148 */ 149 return 24; 150 } 151 EXPORT_SYMBOL(fc_get_pr_transport_id_len); 152 153 u32 fc_get_pr_transport_id( 154 struct se_portal_group *se_tpg, 155 struct se_node_acl *se_nacl, 156 struct t10_pr_registration *pr_reg, 157 int *format_code, 158 unsigned char *buf) 159 { 160 unsigned char binary, *ptr; 161 int i; 162 u32 off = 8; 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 binary = transport_asciihex_to_binaryhex(&ptr[i]); 180 buf[off++] = binary; 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 seperator */ 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 printk(KERN_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 != NULL) { 398 add_len = ((buf[2] >> 8) & 0xff); 399 add_len |= (buf[3] & 0xff); 400 401 tid_len = strlen((char *)&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 printk(KERN_INFO "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' seperator 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((char *)&buf[4], ",i,0x"); 423 if (!(p)) { 424 printk(KERN_ERR "Unable to locate \",i,0x\" seperator" 425 " for Initiator port identifier: %s\n", 426 (char *)&buf[4]); 427 return NULL; 428 } 429 *p = '\0'; /* Terminate iSCSI Name */ 430 p += 5; /* Skip over ",i,0x" seperator */ 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); 452