1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /******************************************************************************* 3 * Filename: target_core_fabric_lib.c 4 * 5 * This file contains generic high level protocol identifier and PR 6 * handlers for TCM fabric modules 7 * 8 * (c) Copyright 2010-2013 Datera, Inc. 9 * 10 * Nicholas A. Bellinger <nab@linux-iscsi.org> 11 * 12 ******************************************************************************/ 13 14 /* 15 * See SPC4, section 7.5 "Protocol specific parameters" for details 16 * on the formats implemented in this file. 17 */ 18 19 #include <linux/kernel.h> 20 #include <linux/string.h> 21 #include <linux/ctype.h> 22 #include <linux/spinlock.h> 23 #include <linux/export.h> 24 #include <asm/unaligned.h> 25 26 #include <scsi/scsi_proto.h> 27 28 #include <target/target_core_base.h> 29 #include <target/target_core_fabric.h> 30 31 #include "target_core_internal.h" 32 #include "target_core_pr.h" 33 34 35 static int sas_get_pr_transport_id( 36 struct se_node_acl *nacl, 37 int *format_code, 38 unsigned char *buf) 39 { 40 int ret; 41 42 /* Skip over 'naa. prefix */ 43 ret = hex2bin(&buf[4], &nacl->initiatorname[4], 8); 44 if (ret) { 45 pr_debug("%s: invalid hex string\n", __func__); 46 return ret; 47 } 48 49 return 24; 50 } 51 52 static int fc_get_pr_transport_id( 53 struct se_node_acl *se_nacl, 54 int *format_code, 55 unsigned char *buf) 56 { 57 unsigned char *ptr; 58 int i, ret; 59 u32 off = 8; 60 61 /* 62 * We convert the ASCII formatted N Port name into a binary 63 * encoded TransportID. 64 */ 65 ptr = &se_nacl->initiatorname[0]; 66 for (i = 0; i < 24; ) { 67 if (!strncmp(&ptr[i], ":", 1)) { 68 i++; 69 continue; 70 } 71 ret = hex2bin(&buf[off++], &ptr[i], 1); 72 if (ret < 0) { 73 pr_debug("%s: invalid hex string\n", __func__); 74 return ret; 75 } 76 i += 2; 77 } 78 /* 79 * The FC Transport ID is a hardcoded 24-byte length 80 */ 81 return 24; 82 } 83 84 static int sbp_get_pr_transport_id( 85 struct se_node_acl *nacl, 86 int *format_code, 87 unsigned char *buf) 88 { 89 int ret; 90 91 ret = hex2bin(&buf[8], nacl->initiatorname, 8); 92 if (ret) { 93 pr_debug("%s: invalid hex string\n", __func__); 94 return ret; 95 } 96 97 return 24; 98 } 99 100 static int srp_get_pr_transport_id( 101 struct se_node_acl *nacl, 102 int *format_code, 103 unsigned char *buf) 104 { 105 const char *p; 106 unsigned len, count, leading_zero_bytes; 107 int rc; 108 109 p = nacl->initiatorname; 110 if (strncasecmp(p, "0x", 2) == 0) 111 p += 2; 112 len = strlen(p); 113 if (len % 2) 114 return -EINVAL; 115 116 count = min(len / 2, 16U); 117 leading_zero_bytes = 16 - count; 118 memset(buf + 8, 0, leading_zero_bytes); 119 rc = hex2bin(buf + 8 + leading_zero_bytes, p, count); 120 if (rc < 0) { 121 pr_debug("hex2bin failed for %s: %d\n", p, rc); 122 return rc; 123 } 124 125 return 24; 126 } 127 128 static int iscsi_get_pr_transport_id( 129 struct se_node_acl *se_nacl, 130 struct t10_pr_registration *pr_reg, 131 int *format_code, 132 unsigned char *buf) 133 { 134 u32 off = 4, padding = 0; 135 u16 len = 0; 136 137 spin_lock_irq(&se_nacl->nacl_sess_lock); 138 /* 139 * From spc4r17 Section 7.5.4.6: TransportID for initiator 140 * ports using SCSI over iSCSI. 141 * 142 * The null-terminated, null-padded (see 4.4.2) ISCSI NAME field 143 * shall contain the iSCSI name of an iSCSI initiator node (see 144 * RFC 3720). The first ISCSI NAME field byte containing an ASCII 145 * null character terminates the ISCSI NAME field without regard for 146 * the specified length of the iSCSI TransportID or the contents of 147 * the ADDITIONAL LENGTH field. 148 */ 149 len = sprintf(&buf[off], "%s", se_nacl->initiatorname); 150 /* 151 * Add Extra byte for NULL terminator 152 */ 153 len++; 154 /* 155 * If there is ISID present with the registration and *format code == 1 156 * 1, use iSCSI Initiator port TransportID format. 157 * 158 * Otherwise use iSCSI Initiator device TransportID format that 159 * does not contain the ASCII encoded iSCSI Initiator iSID value 160 * provied by the iSCSi Initiator during the iSCSI login process. 161 */ 162 if ((*format_code == 1) && (pr_reg->isid_present_at_reg)) { 163 /* 164 * Set FORMAT CODE 01b for iSCSI Initiator port TransportID 165 * format. 166 */ 167 buf[0] |= 0x40; 168 /* 169 * From spc4r17 Section 7.5.4.6: TransportID for initiator 170 * ports using SCSI over iSCSI. Table 390 171 * 172 * The SEPARATOR field shall contain the five ASCII 173 * characters ",i,0x". 174 * 175 * The null-terminated, null-padded ISCSI INITIATOR SESSION ID 176 * field shall contain the iSCSI initiator session identifier 177 * (see RFC 3720) in the form of ASCII characters that are the 178 * hexadecimal digits converted from the binary iSCSI initiator 179 * session identifier value. The first ISCSI INITIATOR SESSION 180 * ID field byte containing an ASCII null character 181 */ 182 buf[off+len] = 0x2c; off++; /* ASCII Character: "," */ 183 buf[off+len] = 0x69; off++; /* ASCII Character: "i" */ 184 buf[off+len] = 0x2c; off++; /* ASCII Character: "," */ 185 buf[off+len] = 0x30; off++; /* ASCII Character: "0" */ 186 buf[off+len] = 0x78; off++; /* ASCII Character: "x" */ 187 len += 5; 188 buf[off+len] = pr_reg->pr_reg_isid[0]; off++; 189 buf[off+len] = pr_reg->pr_reg_isid[1]; off++; 190 buf[off+len] = pr_reg->pr_reg_isid[2]; off++; 191 buf[off+len] = pr_reg->pr_reg_isid[3]; off++; 192 buf[off+len] = pr_reg->pr_reg_isid[4]; off++; 193 buf[off+len] = pr_reg->pr_reg_isid[5]; off++; 194 buf[off+len] = '\0'; off++; 195 len += 7; 196 } 197 spin_unlock_irq(&se_nacl->nacl_sess_lock); 198 /* 199 * The ADDITIONAL LENGTH field specifies the number of bytes that follow 200 * in the TransportID. The additional length shall be at least 20 and 201 * shall be a multiple of four. 202 */ 203 padding = ((-len) & 3); 204 if (padding != 0) 205 len += padding; 206 207 put_unaligned_be16(len, &buf[2]); 208 /* 209 * Increment value for total payload + header length for 210 * full status descriptor 211 */ 212 len += 4; 213 214 return len; 215 } 216 217 static int iscsi_get_pr_transport_id_len( 218 struct se_node_acl *se_nacl, 219 struct t10_pr_registration *pr_reg, 220 int *format_code) 221 { 222 u32 len = 0, padding = 0; 223 224 spin_lock_irq(&se_nacl->nacl_sess_lock); 225 len = strlen(se_nacl->initiatorname); 226 /* 227 * Add extra byte for NULL terminator 228 */ 229 len++; 230 /* 231 * If there is ISID present with the registration, use format code: 232 * 01b: iSCSI Initiator port TransportID format 233 * 234 * If there is not an active iSCSI session, use format code: 235 * 00b: iSCSI Initiator device TransportID format 236 */ 237 if (pr_reg->isid_present_at_reg) { 238 len += 5; /* For ",i,0x" ASCII separator */ 239 len += 7; /* For iSCSI Initiator Session ID + Null terminator */ 240 *format_code = 1; 241 } else 242 *format_code = 0; 243 spin_unlock_irq(&se_nacl->nacl_sess_lock); 244 /* 245 * The ADDITIONAL LENGTH field specifies the number of bytes that follow 246 * in the TransportID. The additional length shall be at least 20 and 247 * shall be a multiple of four. 248 */ 249 padding = ((-len) & 3); 250 if (padding != 0) 251 len += padding; 252 /* 253 * Increment value for total payload + header length for 254 * full status descriptor 255 */ 256 len += 4; 257 258 return len; 259 } 260 261 static char *iscsi_parse_pr_out_transport_id( 262 struct se_portal_group *se_tpg, 263 char *buf, 264 u32 *out_tid_len, 265 char **port_nexus_ptr) 266 { 267 char *p; 268 u32 tid_len, padding; 269 int i; 270 u16 add_len; 271 u8 format_code = (buf[0] & 0xc0); 272 /* 273 * Check for FORMAT CODE 00b or 01b from spc4r17, section 7.5.4.6: 274 * 275 * TransportID for initiator ports using SCSI over iSCSI, 276 * from Table 388 -- iSCSI TransportID formats. 277 * 278 * 00b Initiator port is identified using the world wide unique 279 * SCSI device name of the iSCSI initiator 280 * device containing the initiator port (see table 389). 281 * 01b Initiator port is identified using the world wide unique 282 * initiator port identifier (see table 390).10b to 11b 283 * Reserved 284 */ 285 if ((format_code != 0x00) && (format_code != 0x40)) { 286 pr_err("Illegal format code: 0x%02x for iSCSI" 287 " Initiator Transport ID\n", format_code); 288 return NULL; 289 } 290 /* 291 * If the caller wants the TransportID Length, we set that value for the 292 * entire iSCSI Tarnsport ID now. 293 */ 294 if (out_tid_len) { 295 /* The shift works thanks to integer promotion rules */ 296 add_len = get_unaligned_be16(&buf[2]); 297 298 tid_len = strlen(&buf[4]); 299 tid_len += 4; /* Add four bytes for iSCSI Transport ID header */ 300 tid_len += 1; /* Add one byte for NULL terminator */ 301 padding = ((-tid_len) & 3); 302 if (padding != 0) 303 tid_len += padding; 304 305 if ((add_len + 4) != tid_len) { 306 pr_debug("LIO-Target Extracted add_len: %hu " 307 "does not match calculated tid_len: %u," 308 " using tid_len instead\n", add_len+4, tid_len); 309 *out_tid_len = tid_len; 310 } else 311 *out_tid_len = (add_len + 4); 312 } 313 /* 314 * Check for ',i,0x' separator between iSCSI Name and iSCSI Initiator 315 * Session ID as defined in Table 390 - iSCSI initiator port TransportID 316 * format. 317 */ 318 if (format_code == 0x40) { 319 p = strstr(&buf[4], ",i,0x"); 320 if (!p) { 321 pr_err("Unable to locate \",i,0x\" separator" 322 " for Initiator port identifier: %s\n", 323 &buf[4]); 324 return NULL; 325 } 326 *p = '\0'; /* Terminate iSCSI Name */ 327 p += 5; /* Skip over ",i,0x" separator */ 328 329 *port_nexus_ptr = p; 330 /* 331 * Go ahead and do the lower case conversion of the received 332 * 12 ASCII characters representing the ISID in the TransportID 333 * for comparison against the running iSCSI session's ISID from 334 * iscsi_target.c:lio_sess_get_initiator_sid() 335 */ 336 for (i = 0; i < 12; i++) { 337 if (isdigit(*p)) { 338 p++; 339 continue; 340 } 341 *p = tolower(*p); 342 p++; 343 } 344 } 345 346 return &buf[4]; 347 } 348 349 int target_get_pr_transport_id_len(struct se_node_acl *nacl, 350 struct t10_pr_registration *pr_reg, int *format_code) 351 { 352 switch (nacl->se_tpg->proto_id) { 353 case SCSI_PROTOCOL_FCP: 354 case SCSI_PROTOCOL_SBP: 355 case SCSI_PROTOCOL_SRP: 356 case SCSI_PROTOCOL_SAS: 357 break; 358 case SCSI_PROTOCOL_ISCSI: 359 return iscsi_get_pr_transport_id_len(nacl, pr_reg, format_code); 360 default: 361 pr_err("Unknown proto_id: 0x%02x\n", nacl->se_tpg->proto_id); 362 return -EINVAL; 363 } 364 365 /* 366 * Most transports use a fixed length 24 byte identifier. 367 */ 368 *format_code = 0; 369 return 24; 370 } 371 372 int target_get_pr_transport_id(struct se_node_acl *nacl, 373 struct t10_pr_registration *pr_reg, int *format_code, 374 unsigned char *buf) 375 { 376 switch (nacl->se_tpg->proto_id) { 377 case SCSI_PROTOCOL_SAS: 378 return sas_get_pr_transport_id(nacl, format_code, buf); 379 case SCSI_PROTOCOL_SBP: 380 return sbp_get_pr_transport_id(nacl, format_code, buf); 381 case SCSI_PROTOCOL_SRP: 382 return srp_get_pr_transport_id(nacl, format_code, buf); 383 case SCSI_PROTOCOL_FCP: 384 return fc_get_pr_transport_id(nacl, format_code, buf); 385 case SCSI_PROTOCOL_ISCSI: 386 return iscsi_get_pr_transport_id(nacl, pr_reg, format_code, 387 buf); 388 default: 389 pr_err("Unknown proto_id: 0x%02x\n", nacl->se_tpg->proto_id); 390 return -EINVAL; 391 } 392 } 393 394 const char *target_parse_pr_out_transport_id(struct se_portal_group *tpg, 395 char *buf, u32 *out_tid_len, char **port_nexus_ptr) 396 { 397 u32 offset; 398 399 switch (tpg->proto_id) { 400 case SCSI_PROTOCOL_SAS: 401 /* 402 * Assume the FORMAT CODE 00b from spc4r17, 7.5.4.7 TransportID 403 * for initiator ports using SCSI over SAS Serial SCSI Protocol. 404 */ 405 offset = 4; 406 break; 407 case SCSI_PROTOCOL_SBP: 408 case SCSI_PROTOCOL_SRP: 409 case SCSI_PROTOCOL_FCP: 410 offset = 8; 411 break; 412 case SCSI_PROTOCOL_ISCSI: 413 return iscsi_parse_pr_out_transport_id(tpg, buf, out_tid_len, 414 port_nexus_ptr); 415 default: 416 pr_err("Unknown proto_id: 0x%02x\n", tpg->proto_id); 417 return NULL; 418 } 419 420 *port_nexus_ptr = NULL; 421 *out_tid_len = 24; 422 return buf + offset; 423 } 424