1 /******************************************************************************* 2 * Filename: tcm_fc.c 3 * 4 * This file contains the configfs implementation for TCM_fc fabric node. 5 * Based on tcm_loop_configfs.c 6 * 7 * Copyright (c) 2010 Cisco Systems, Inc. 8 * Copyright (c) 2009,2010 Rising Tide, Inc. 9 * Copyright (c) 2009,2010 Linux-iSCSI.org 10 * 11 * Copyright (c) 2009,2010 Nicholas A. Bellinger <nab@linux-iscsi.org> 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 ****************************************************************************/ 23 24 #include <linux/module.h> 25 #include <linux/moduleparam.h> 26 #include <generated/utsrelease.h> 27 #include <linux/utsname.h> 28 #include <linux/init.h> 29 #include <linux/slab.h> 30 #include <linux/kthread.h> 31 #include <linux/types.h> 32 #include <linux/string.h> 33 #include <linux/configfs.h> 34 #include <linux/kernel.h> 35 #include <linux/ctype.h> 36 #include <asm/unaligned.h> 37 #include <scsi/scsi.h> 38 #include <scsi/scsi_host.h> 39 #include <scsi/scsi_device.h> 40 #include <scsi/scsi_cmnd.h> 41 #include <scsi/libfc.h> 42 43 #include <target/target_core_base.h> 44 #include <target/target_core_fabric.h> 45 #include <target/target_core_fabric_configfs.h> 46 #include <target/target_core_configfs.h> 47 #include <target/configfs_macros.h> 48 49 #include "tcm_fc.h" 50 51 struct target_fabric_configfs *ft_configfs; 52 53 LIST_HEAD(ft_lport_list); 54 DEFINE_MUTEX(ft_lport_lock); 55 56 unsigned int ft_debug_logging; 57 module_param_named(debug_logging, ft_debug_logging, int, S_IRUGO|S_IWUSR); 58 MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels"); 59 60 /* 61 * Parse WWN. 62 * If strict, we require lower-case hex and colon separators to be sure 63 * the name is the same as what would be generated by ft_format_wwn() 64 * so the name and wwn are mapped one-to-one. 65 */ 66 static ssize_t ft_parse_wwn(const char *name, u64 *wwn, int strict) 67 { 68 const char *cp; 69 char c; 70 u32 byte = 0; 71 u32 pos = 0; 72 u32 err; 73 int val; 74 75 *wwn = 0; 76 for (cp = name; cp < &name[FT_NAMELEN - 1]; cp++) { 77 c = *cp; 78 if (c == '\n' && cp[1] == '\0') 79 continue; 80 if (strict && pos++ == 2 && byte++ < 7) { 81 pos = 0; 82 if (c == ':') 83 continue; 84 err = 1; 85 goto fail; 86 } 87 if (c == '\0') { 88 err = 2; 89 if (strict && byte != 8) 90 goto fail; 91 return cp - name; 92 } 93 err = 3; 94 val = hex_to_bin(c); 95 if (val < 0 || (strict && isupper(c))) 96 goto fail; 97 *wwn = (*wwn << 4) | val; 98 } 99 err = 4; 100 fail: 101 pr_debug("err %u len %zu pos %u byte %u\n", 102 err, cp - name, pos, byte); 103 return -1; 104 } 105 106 ssize_t ft_format_wwn(char *buf, size_t len, u64 wwn) 107 { 108 u8 b[8]; 109 110 put_unaligned_be64(wwn, b); 111 return snprintf(buf, len, 112 "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x", 113 b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]); 114 } 115 116 static ssize_t ft_wwn_show(void *arg, char *buf) 117 { 118 u64 *wwn = arg; 119 ssize_t len; 120 121 len = ft_format_wwn(buf, PAGE_SIZE - 2, *wwn); 122 buf[len++] = '\n'; 123 return len; 124 } 125 126 static ssize_t ft_wwn_store(void *arg, const char *buf, size_t len) 127 { 128 ssize_t ret; 129 u64 wwn; 130 131 ret = ft_parse_wwn(buf, &wwn, 0); 132 if (ret > 0) 133 *(u64 *)arg = wwn; 134 return ret; 135 } 136 137 /* 138 * ACL auth ops. 139 */ 140 141 static ssize_t ft_nacl_show_port_name( 142 struct se_node_acl *se_nacl, 143 char *page) 144 { 145 struct ft_node_acl *acl = container_of(se_nacl, 146 struct ft_node_acl, se_node_acl); 147 148 return ft_wwn_show(&acl->node_auth.port_name, page); 149 } 150 151 static ssize_t ft_nacl_store_port_name( 152 struct se_node_acl *se_nacl, 153 const char *page, 154 size_t count) 155 { 156 struct ft_node_acl *acl = container_of(se_nacl, 157 struct ft_node_acl, se_node_acl); 158 159 return ft_wwn_store(&acl->node_auth.port_name, page, count); 160 } 161 162 TF_NACL_BASE_ATTR(ft, port_name, S_IRUGO | S_IWUSR); 163 164 static ssize_t ft_nacl_show_node_name( 165 struct se_node_acl *se_nacl, 166 char *page) 167 { 168 struct ft_node_acl *acl = container_of(se_nacl, 169 struct ft_node_acl, se_node_acl); 170 171 return ft_wwn_show(&acl->node_auth.node_name, page); 172 } 173 174 static ssize_t ft_nacl_store_node_name( 175 struct se_node_acl *se_nacl, 176 const char *page, 177 size_t count) 178 { 179 struct ft_node_acl *acl = container_of(se_nacl, 180 struct ft_node_acl, se_node_acl); 181 182 return ft_wwn_store(&acl->node_auth.node_name, page, count); 183 } 184 185 TF_NACL_BASE_ATTR(ft, node_name, S_IRUGO | S_IWUSR); 186 187 static struct configfs_attribute *ft_nacl_base_attrs[] = { 188 &ft_nacl_port_name.attr, 189 &ft_nacl_node_name.attr, 190 NULL, 191 }; 192 193 /* 194 * ACL ops. 195 */ 196 197 /* 198 * Add ACL for an initiator. The ACL is named arbitrarily. 199 * The port_name and/or node_name are attributes. 200 */ 201 static struct se_node_acl *ft_add_acl( 202 struct se_portal_group *se_tpg, 203 struct config_group *group, 204 const char *name) 205 { 206 struct ft_node_acl *acl; 207 struct ft_tpg *tpg; 208 u64 wwpn; 209 u32 q_depth; 210 211 pr_debug("add acl %s\n", name); 212 tpg = container_of(se_tpg, struct ft_tpg, se_tpg); 213 214 if (ft_parse_wwn(name, &wwpn, 1) < 0) 215 return ERR_PTR(-EINVAL); 216 217 acl = kzalloc(sizeof(struct ft_node_acl), GFP_KERNEL); 218 if (!acl) 219 return ERR_PTR(-ENOMEM); 220 acl->node_auth.port_name = wwpn; 221 222 q_depth = 32; /* XXX bogus default - get from tpg? */ 223 return core_tpg_add_initiator_node_acl(&tpg->se_tpg, 224 &acl->se_node_acl, name, q_depth); 225 } 226 227 static void ft_del_acl(struct se_node_acl *se_acl) 228 { 229 struct se_portal_group *se_tpg = se_acl->se_tpg; 230 struct ft_tpg *tpg; 231 struct ft_node_acl *acl = container_of(se_acl, 232 struct ft_node_acl, se_node_acl); 233 234 pr_debug("del acl %s\n", 235 config_item_name(&se_acl->acl_group.cg_item)); 236 237 tpg = container_of(se_tpg, struct ft_tpg, se_tpg); 238 pr_debug("del acl %p se_acl %p tpg %p se_tpg %p\n", 239 acl, se_acl, tpg, &tpg->se_tpg); 240 241 core_tpg_del_initiator_node_acl(&tpg->se_tpg, se_acl, 1); 242 kfree(acl); 243 } 244 245 struct ft_node_acl *ft_acl_get(struct ft_tpg *tpg, struct fc_rport_priv *rdata) 246 { 247 struct ft_node_acl *found = NULL; 248 struct ft_node_acl *acl; 249 struct se_portal_group *se_tpg = &tpg->se_tpg; 250 struct se_node_acl *se_acl; 251 252 spin_lock_irq(&se_tpg->acl_node_lock); 253 list_for_each_entry(se_acl, &se_tpg->acl_node_list, acl_list) { 254 acl = container_of(se_acl, struct ft_node_acl, se_node_acl); 255 pr_debug("acl %p port_name %llx\n", 256 acl, (unsigned long long)acl->node_auth.port_name); 257 if (acl->node_auth.port_name == rdata->ids.port_name || 258 acl->node_auth.node_name == rdata->ids.node_name) { 259 pr_debug("acl %p port_name %llx matched\n", acl, 260 (unsigned long long)rdata->ids.port_name); 261 found = acl; 262 /* XXX need to hold onto ACL */ 263 break; 264 } 265 } 266 spin_unlock_irq(&se_tpg->acl_node_lock); 267 return found; 268 } 269 270 struct se_node_acl *ft_tpg_alloc_fabric_acl(struct se_portal_group *se_tpg) 271 { 272 struct ft_node_acl *acl; 273 274 acl = kzalloc(sizeof(*acl), GFP_KERNEL); 275 if (!acl) { 276 pr_err("Unable to allocate struct ft_node_acl\n"); 277 return NULL; 278 } 279 pr_debug("acl %p\n", acl); 280 return &acl->se_node_acl; 281 } 282 283 static void ft_tpg_release_fabric_acl(struct se_portal_group *se_tpg, 284 struct se_node_acl *se_acl) 285 { 286 struct ft_node_acl *acl = container_of(se_acl, 287 struct ft_node_acl, se_node_acl); 288 289 pr_debug("acl %p\n", acl); 290 kfree(acl); 291 } 292 293 /* 294 * local_port port_group (tpg) ops. 295 */ 296 static struct se_portal_group *ft_add_tpg( 297 struct se_wwn *wwn, 298 struct config_group *group, 299 const char *name) 300 { 301 struct ft_lport_acl *lacl; 302 struct ft_tpg *tpg; 303 struct workqueue_struct *wq; 304 unsigned long index; 305 int ret; 306 307 pr_debug("tcm_fc: add tpg %s\n", name); 308 309 /* 310 * Name must be "tpgt_" followed by the index. 311 */ 312 if (strstr(name, "tpgt_") != name) 313 return NULL; 314 315 ret = kstrtoul(name + 5, 10, &index); 316 if (ret) 317 return NULL; 318 if (index > UINT_MAX) 319 return NULL; 320 321 lacl = container_of(wwn, struct ft_lport_acl, fc_lport_wwn); 322 tpg = kzalloc(sizeof(*tpg), GFP_KERNEL); 323 if (!tpg) 324 return NULL; 325 tpg->index = index; 326 tpg->lport_acl = lacl; 327 INIT_LIST_HEAD(&tpg->lun_list); 328 329 wq = alloc_workqueue("tcm_fc", 0, 1); 330 if (!wq) { 331 kfree(tpg); 332 return NULL; 333 } 334 335 ret = core_tpg_register(&ft_configfs->tf_ops, wwn, &tpg->se_tpg, 336 tpg, TRANSPORT_TPG_TYPE_NORMAL); 337 if (ret < 0) { 338 destroy_workqueue(wq); 339 kfree(tpg); 340 return NULL; 341 } 342 tpg->workqueue = wq; 343 344 mutex_lock(&ft_lport_lock); 345 list_add_tail(&tpg->list, &lacl->tpg_list); 346 mutex_unlock(&ft_lport_lock); 347 348 return &tpg->se_tpg; 349 } 350 351 static void ft_del_tpg(struct se_portal_group *se_tpg) 352 { 353 struct ft_tpg *tpg = container_of(se_tpg, struct ft_tpg, se_tpg); 354 355 pr_debug("del tpg %s\n", 356 config_item_name(&tpg->se_tpg.tpg_group.cg_item)); 357 358 destroy_workqueue(tpg->workqueue); 359 360 /* Wait for sessions to be freed thru RCU, for BUG_ON below */ 361 synchronize_rcu(); 362 363 mutex_lock(&ft_lport_lock); 364 list_del(&tpg->list); 365 if (tpg->tport) { 366 tpg->tport->tpg = NULL; 367 tpg->tport = NULL; 368 } 369 mutex_unlock(&ft_lport_lock); 370 371 core_tpg_deregister(se_tpg); 372 kfree(tpg); 373 } 374 375 /* 376 * Verify that an lport is configured to use the tcm_fc module, and return 377 * the target port group that should be used. 378 * 379 * The caller holds ft_lport_lock. 380 */ 381 struct ft_tpg *ft_lport_find_tpg(struct fc_lport *lport) 382 { 383 struct ft_lport_acl *lacl; 384 struct ft_tpg *tpg; 385 386 list_for_each_entry(lacl, &ft_lport_list, list) { 387 if (lacl->wwpn == lport->wwpn) { 388 list_for_each_entry(tpg, &lacl->tpg_list, list) 389 return tpg; /* XXX for now return first entry */ 390 return NULL; 391 } 392 } 393 return NULL; 394 } 395 396 /* 397 * target config instance ops. 398 */ 399 400 /* 401 * Add lport to allowed config. 402 * The name is the WWPN in lower-case ASCII, colon-separated bytes. 403 */ 404 static struct se_wwn *ft_add_lport( 405 struct target_fabric_configfs *tf, 406 struct config_group *group, 407 const char *name) 408 { 409 struct ft_lport_acl *lacl; 410 struct ft_lport_acl *old_lacl; 411 u64 wwpn; 412 413 pr_debug("add lport %s\n", name); 414 if (ft_parse_wwn(name, &wwpn, 1) < 0) 415 return NULL; 416 lacl = kzalloc(sizeof(*lacl), GFP_KERNEL); 417 if (!lacl) 418 return NULL; 419 lacl->wwpn = wwpn; 420 INIT_LIST_HEAD(&lacl->tpg_list); 421 422 mutex_lock(&ft_lport_lock); 423 list_for_each_entry(old_lacl, &ft_lport_list, list) { 424 if (old_lacl->wwpn == wwpn) { 425 mutex_unlock(&ft_lport_lock); 426 kfree(lacl); 427 return NULL; 428 } 429 } 430 list_add_tail(&lacl->list, &ft_lport_list); 431 ft_format_wwn(lacl->name, sizeof(lacl->name), wwpn); 432 mutex_unlock(&ft_lport_lock); 433 434 return &lacl->fc_lport_wwn; 435 } 436 437 static void ft_del_lport(struct se_wwn *wwn) 438 { 439 struct ft_lport_acl *lacl = container_of(wwn, 440 struct ft_lport_acl, fc_lport_wwn); 441 442 pr_debug("del lport %s\n", lacl->name); 443 mutex_lock(&ft_lport_lock); 444 list_del(&lacl->list); 445 mutex_unlock(&ft_lport_lock); 446 447 kfree(lacl); 448 } 449 450 static ssize_t ft_wwn_show_attr_version( 451 struct target_fabric_configfs *tf, 452 char *page) 453 { 454 return sprintf(page, "TCM FC " FT_VERSION " on %s/%s on " 455 ""UTS_RELEASE"\n", utsname()->sysname, utsname()->machine); 456 } 457 458 TF_WWN_ATTR_RO(ft, version); 459 460 static struct configfs_attribute *ft_wwn_attrs[] = { 461 &ft_wwn_version.attr, 462 NULL, 463 }; 464 465 static char *ft_get_fabric_name(void) 466 { 467 return "fc"; 468 } 469 470 static char *ft_get_fabric_wwn(struct se_portal_group *se_tpg) 471 { 472 struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr; 473 474 return tpg->lport_acl->name; 475 } 476 477 static u16 ft_get_tag(struct se_portal_group *se_tpg) 478 { 479 struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr; 480 481 /* 482 * This tag is used when forming SCSI Name identifier in EVPD=1 0x83 483 * to represent the SCSI Target Port. 484 */ 485 return tpg->index; 486 } 487 488 static u32 ft_get_default_depth(struct se_portal_group *se_tpg) 489 { 490 return 1; 491 } 492 493 static int ft_check_false(struct se_portal_group *se_tpg) 494 { 495 return 0; 496 } 497 498 static void ft_set_default_node_attr(struct se_node_acl *se_nacl) 499 { 500 } 501 502 static u32 ft_tpg_get_inst_index(struct se_portal_group *se_tpg) 503 { 504 struct ft_tpg *tpg = se_tpg->se_tpg_fabric_ptr; 505 506 return tpg->index; 507 } 508 509 static struct target_core_fabric_ops ft_fabric_ops = { 510 .get_fabric_name = ft_get_fabric_name, 511 .get_fabric_proto_ident = fc_get_fabric_proto_ident, 512 .tpg_get_wwn = ft_get_fabric_wwn, 513 .tpg_get_tag = ft_get_tag, 514 .tpg_get_default_depth = ft_get_default_depth, 515 .tpg_get_pr_transport_id = fc_get_pr_transport_id, 516 .tpg_get_pr_transport_id_len = fc_get_pr_transport_id_len, 517 .tpg_parse_pr_out_transport_id = fc_parse_pr_out_transport_id, 518 .tpg_check_demo_mode = ft_check_false, 519 .tpg_check_demo_mode_cache = ft_check_false, 520 .tpg_check_demo_mode_write_protect = ft_check_false, 521 .tpg_check_prod_mode_write_protect = ft_check_false, 522 .tpg_alloc_fabric_acl = ft_tpg_alloc_fabric_acl, 523 .tpg_release_fabric_acl = ft_tpg_release_fabric_acl, 524 .tpg_get_inst_index = ft_tpg_get_inst_index, 525 .check_stop_free = ft_check_stop_free, 526 .release_cmd = ft_release_cmd, 527 .shutdown_session = ft_sess_shutdown, 528 .close_session = ft_sess_close, 529 .sess_get_index = ft_sess_get_index, 530 .sess_get_initiator_sid = NULL, 531 .write_pending = ft_write_pending, 532 .write_pending_status = ft_write_pending_status, 533 .set_default_node_attributes = ft_set_default_node_attr, 534 .get_task_tag = ft_get_task_tag, 535 .get_cmd_state = ft_get_cmd_state, 536 .queue_data_in = ft_queue_data_in, 537 .queue_status = ft_queue_status, 538 .queue_tm_rsp = ft_queue_tm_resp, 539 /* 540 * Setup function pointers for generic logic in 541 * target_core_fabric_configfs.c 542 */ 543 .fabric_make_wwn = &ft_add_lport, 544 .fabric_drop_wwn = &ft_del_lport, 545 .fabric_make_tpg = &ft_add_tpg, 546 .fabric_drop_tpg = &ft_del_tpg, 547 .fabric_post_link = NULL, 548 .fabric_pre_unlink = NULL, 549 .fabric_make_np = NULL, 550 .fabric_drop_np = NULL, 551 .fabric_make_nodeacl = &ft_add_acl, 552 .fabric_drop_nodeacl = &ft_del_acl, 553 }; 554 555 int ft_register_configfs(void) 556 { 557 struct target_fabric_configfs *fabric; 558 int ret; 559 560 /* 561 * Register the top level struct config_item_type with TCM core 562 */ 563 fabric = target_fabric_configfs_init(THIS_MODULE, "fc"); 564 if (IS_ERR(fabric)) { 565 pr_err("%s: target_fabric_configfs_init() failed!\n", 566 __func__); 567 return PTR_ERR(fabric); 568 } 569 fabric->tf_ops = ft_fabric_ops; 570 571 /* 572 * Setup default attribute lists for various fabric->tf_cit_tmpl 573 */ 574 TF_CIT_TMPL(fabric)->tfc_wwn_cit.ct_attrs = ft_wwn_attrs; 575 TF_CIT_TMPL(fabric)->tfc_tpg_base_cit.ct_attrs = NULL; 576 TF_CIT_TMPL(fabric)->tfc_tpg_attrib_cit.ct_attrs = NULL; 577 TF_CIT_TMPL(fabric)->tfc_tpg_param_cit.ct_attrs = NULL; 578 TF_CIT_TMPL(fabric)->tfc_tpg_np_base_cit.ct_attrs = NULL; 579 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_base_cit.ct_attrs = 580 ft_nacl_base_attrs; 581 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_attrib_cit.ct_attrs = NULL; 582 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_auth_cit.ct_attrs = NULL; 583 TF_CIT_TMPL(fabric)->tfc_tpg_nacl_param_cit.ct_attrs = NULL; 584 /* 585 * register the fabric for use within TCM 586 */ 587 ret = target_fabric_configfs_register(fabric); 588 if (ret < 0) { 589 pr_debug("target_fabric_configfs_register() for" 590 " FC Target failed!\n"); 591 target_fabric_configfs_free(fabric); 592 return -1; 593 } 594 595 /* 596 * Setup our local pointer to *fabric. 597 */ 598 ft_configfs = fabric; 599 return 0; 600 } 601 602 void ft_deregister_configfs(void) 603 { 604 if (!ft_configfs) 605 return; 606 target_fabric_configfs_deregister(ft_configfs); 607 ft_configfs = NULL; 608 } 609 610 static struct notifier_block ft_notifier = { 611 .notifier_call = ft_lport_notify 612 }; 613 614 static int __init ft_init(void) 615 { 616 if (ft_register_configfs()) 617 return -1; 618 if (fc_fc4_register_provider(FC_TYPE_FCP, &ft_prov)) { 619 ft_deregister_configfs(); 620 return -1; 621 } 622 blocking_notifier_chain_register(&fc_lport_notifier_head, &ft_notifier); 623 fc_lport_iterate(ft_lport_add, NULL); 624 return 0; 625 } 626 627 static void __exit ft_exit(void) 628 { 629 blocking_notifier_chain_unregister(&fc_lport_notifier_head, 630 &ft_notifier); 631 fc_fc4_deregister_provider(FC_TYPE_FCP, &ft_prov); 632 fc_lport_iterate(ft_lport_del, NULL); 633 ft_deregister_configfs(); 634 synchronize_rcu(); 635 } 636 637 MODULE_DESCRIPTION("FC TCM fabric driver " FT_VERSION); 638 MODULE_LICENSE("GPL"); 639 module_init(ft_init); 640 module_exit(ft_exit); 641