1 /******************************************************************************* 2 * This file contains the login functions used by the iSCSI Target driver. 3 * 4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC. 5 * 6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2. 7 * 8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 ******************************************************************************/ 20 21 #include <linux/string.h> 22 #include <linux/kthread.h> 23 #include <linux/crypto.h> 24 #include <linux/idr.h> 25 #include <scsi/iscsi_proto.h> 26 #include <target/target_core_base.h> 27 #include <target/target_core_fabric.h> 28 29 #include "iscsi_target_core.h" 30 #include "iscsi_target_tq.h" 31 #include "iscsi_target_device.h" 32 #include "iscsi_target_nego.h" 33 #include "iscsi_target_erl0.h" 34 #include "iscsi_target_erl2.h" 35 #include "iscsi_target_login.h" 36 #include "iscsi_target_stat.h" 37 #include "iscsi_target_tpg.h" 38 #include "iscsi_target_util.h" 39 #include "iscsi_target.h" 40 #include "iscsi_target_parameters.h" 41 42 #include <target/iscsi/iscsi_transport.h> 43 44 static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn) 45 { 46 struct iscsi_login *login; 47 48 login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL); 49 if (!login) { 50 pr_err("Unable to allocate memory for struct iscsi_login.\n"); 51 return NULL; 52 } 53 login->conn = conn; 54 login->first_request = 1; 55 56 login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL); 57 if (!login->req_buf) { 58 pr_err("Unable to allocate memory for response buffer.\n"); 59 goto out_login; 60 } 61 62 login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL); 63 if (!login->rsp_buf) { 64 pr_err("Unable to allocate memory for request buffer.\n"); 65 goto out_req_buf; 66 } 67 68 conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL); 69 if (!conn->conn_ops) { 70 pr_err("Unable to allocate memory for" 71 " struct iscsi_conn_ops.\n"); 72 goto out_rsp_buf; 73 } 74 75 init_waitqueue_head(&conn->queues_wq); 76 INIT_LIST_HEAD(&conn->conn_list); 77 INIT_LIST_HEAD(&conn->conn_cmd_list); 78 INIT_LIST_HEAD(&conn->immed_queue_list); 79 INIT_LIST_HEAD(&conn->response_queue_list); 80 init_completion(&conn->conn_post_wait_comp); 81 init_completion(&conn->conn_wait_comp); 82 init_completion(&conn->conn_wait_rcfr_comp); 83 init_completion(&conn->conn_waiting_on_uc_comp); 84 init_completion(&conn->conn_logout_comp); 85 init_completion(&conn->rx_half_close_comp); 86 init_completion(&conn->tx_half_close_comp); 87 spin_lock_init(&conn->cmd_lock); 88 spin_lock_init(&conn->conn_usage_lock); 89 spin_lock_init(&conn->immed_queue_lock); 90 spin_lock_init(&conn->nopin_timer_lock); 91 spin_lock_init(&conn->response_queue_lock); 92 spin_lock_init(&conn->state_lock); 93 94 if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) { 95 pr_err("Unable to allocate conn->conn_cpumask\n"); 96 goto out_conn_ops; 97 } 98 conn->conn_login = login; 99 100 return login; 101 102 out_conn_ops: 103 kfree(conn->conn_ops); 104 out_rsp_buf: 105 kfree(login->rsp_buf); 106 out_req_buf: 107 kfree(login->req_buf); 108 out_login: 109 kfree(login); 110 return NULL; 111 } 112 113 /* 114 * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup 115 * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel 116 */ 117 int iscsi_login_setup_crypto(struct iscsi_conn *conn) 118 { 119 /* 120 * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts 121 * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback 122 * to software 1x8 byte slicing from crc32c.ko 123 */ 124 conn->conn_rx_hash.flags = 0; 125 conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0, 126 CRYPTO_ALG_ASYNC); 127 if (IS_ERR(conn->conn_rx_hash.tfm)) { 128 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n"); 129 return -ENOMEM; 130 } 131 132 conn->conn_tx_hash.flags = 0; 133 conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0, 134 CRYPTO_ALG_ASYNC); 135 if (IS_ERR(conn->conn_tx_hash.tfm)) { 136 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n"); 137 crypto_free_hash(conn->conn_rx_hash.tfm); 138 return -ENOMEM; 139 } 140 141 return 0; 142 } 143 144 static int iscsi_login_check_initiator_version( 145 struct iscsi_conn *conn, 146 u8 version_max, 147 u8 version_min) 148 { 149 if ((version_max != 0x00) || (version_min != 0x00)) { 150 pr_err("Unsupported iSCSI IETF Pre-RFC Revision," 151 " version Min/Max 0x%02x/0x%02x, rejecting login.\n", 152 version_min, version_max); 153 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 154 ISCSI_LOGIN_STATUS_NO_VERSION); 155 return -1; 156 } 157 158 return 0; 159 } 160 161 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn) 162 { 163 int sessiontype; 164 struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL; 165 struct iscsi_portal_group *tpg = conn->tpg; 166 struct iscsi_session *sess = NULL, *sess_p = NULL; 167 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 168 struct se_session *se_sess, *se_sess_tmp; 169 170 initiatorname_param = iscsi_find_param_from_key( 171 INITIATORNAME, conn->param_list); 172 sessiontype_param = iscsi_find_param_from_key( 173 SESSIONTYPE, conn->param_list); 174 if (!initiatorname_param || !sessiontype_param) { 175 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 176 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 177 return -1; 178 } 179 180 sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0; 181 182 spin_lock_bh(&se_tpg->session_lock); 183 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 184 sess_list) { 185 186 sess_p = se_sess->fabric_sess_ptr; 187 spin_lock(&sess_p->conn_lock); 188 if (atomic_read(&sess_p->session_fall_back_to_erl0) || 189 atomic_read(&sess_p->session_logout) || 190 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 191 spin_unlock(&sess_p->conn_lock); 192 continue; 193 } 194 if (!memcmp(sess_p->isid, conn->sess->isid, 6) && 195 (!strcmp(sess_p->sess_ops->InitiatorName, 196 initiatorname_param->value) && 197 (sess_p->sess_ops->SessionType == sessiontype))) { 198 atomic_set(&sess_p->session_reinstatement, 1); 199 spin_unlock(&sess_p->conn_lock); 200 iscsit_inc_session_usage_count(sess_p); 201 iscsit_stop_time2retain_timer(sess_p); 202 sess = sess_p; 203 break; 204 } 205 spin_unlock(&sess_p->conn_lock); 206 } 207 spin_unlock_bh(&se_tpg->session_lock); 208 /* 209 * If the Time2Retain handler has expired, the session is already gone. 210 */ 211 if (!sess) 212 return 0; 213 214 pr_debug("%s iSCSI Session SID %u is still active for %s," 215 " preforming session reinstatement.\n", (sessiontype) ? 216 "Discovery" : "Normal", sess->sid, 217 sess->sess_ops->InitiatorName); 218 219 spin_lock_bh(&sess->conn_lock); 220 if (sess->session_state == TARG_SESS_STATE_FAILED) { 221 spin_unlock_bh(&sess->conn_lock); 222 iscsit_dec_session_usage_count(sess); 223 target_put_session(sess->se_sess); 224 return 0; 225 } 226 spin_unlock_bh(&sess->conn_lock); 227 228 iscsit_stop_session(sess, 1, 1); 229 iscsit_dec_session_usage_count(sess); 230 231 target_put_session(sess->se_sess); 232 return 0; 233 } 234 235 static void iscsi_login_set_conn_values( 236 struct iscsi_session *sess, 237 struct iscsi_conn *conn, 238 __be16 cid) 239 { 240 conn->sess = sess; 241 conn->cid = be16_to_cpu(cid); 242 /* 243 * Generate a random Status sequence number (statsn) for the new 244 * iSCSI connection. 245 */ 246 get_random_bytes(&conn->stat_sn, sizeof(u32)); 247 248 mutex_lock(&auth_id_lock); 249 conn->auth_id = iscsit_global->auth_id++; 250 mutex_unlock(&auth_id_lock); 251 } 252 253 /* 254 * This is the leading connection of a new session, 255 * or session reinstatement. 256 */ 257 static int iscsi_login_zero_tsih_s1( 258 struct iscsi_conn *conn, 259 unsigned char *buf) 260 { 261 struct iscsi_session *sess = NULL; 262 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf; 263 int ret; 264 265 sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL); 266 if (!sess) { 267 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 268 ISCSI_LOGIN_STATUS_NO_RESOURCES); 269 pr_err("Could not allocate memory for session\n"); 270 return -ENOMEM; 271 } 272 273 iscsi_login_set_conn_values(sess, conn, pdu->cid); 274 sess->init_task_tag = pdu->itt; 275 memcpy(&sess->isid, pdu->isid, 6); 276 sess->exp_cmd_sn = be32_to_cpu(pdu->cmdsn); 277 INIT_LIST_HEAD(&sess->sess_conn_list); 278 INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list); 279 INIT_LIST_HEAD(&sess->cr_active_list); 280 INIT_LIST_HEAD(&sess->cr_inactive_list); 281 init_completion(&sess->async_msg_comp); 282 init_completion(&sess->reinstatement_comp); 283 init_completion(&sess->session_wait_comp); 284 init_completion(&sess->session_waiting_on_uc_comp); 285 mutex_init(&sess->cmdsn_mutex); 286 spin_lock_init(&sess->conn_lock); 287 spin_lock_init(&sess->cr_a_lock); 288 spin_lock_init(&sess->cr_i_lock); 289 spin_lock_init(&sess->session_usage_lock); 290 spin_lock_init(&sess->ttt_lock); 291 292 idr_preload(GFP_KERNEL); 293 spin_lock_bh(&sess_idr_lock); 294 ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT); 295 if (ret >= 0) 296 sess->session_index = ret; 297 spin_unlock_bh(&sess_idr_lock); 298 idr_preload_end(); 299 300 if (ret < 0) { 301 pr_err("idr_alloc() for sess_idr failed\n"); 302 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 303 ISCSI_LOGIN_STATUS_NO_RESOURCES); 304 kfree(sess); 305 return -ENOMEM; 306 } 307 308 sess->creation_time = get_jiffies_64(); 309 spin_lock_init(&sess->session_stats_lock); 310 /* 311 * The FFP CmdSN window values will be allocated from the TPG's 312 * Initiator Node's ACL once the login has been successfully completed. 313 */ 314 sess->max_cmd_sn = be32_to_cpu(pdu->cmdsn); 315 316 sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL); 317 if (!sess->sess_ops) { 318 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 319 ISCSI_LOGIN_STATUS_NO_RESOURCES); 320 pr_err("Unable to allocate memory for" 321 " struct iscsi_sess_ops.\n"); 322 kfree(sess); 323 return -ENOMEM; 324 } 325 326 sess->se_sess = transport_init_session(); 327 if (IS_ERR(sess->se_sess)) { 328 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 329 ISCSI_LOGIN_STATUS_NO_RESOURCES); 330 kfree(sess); 331 return -ENOMEM; 332 } 333 334 return 0; 335 } 336 337 static int iscsi_login_zero_tsih_s2( 338 struct iscsi_conn *conn) 339 { 340 struct iscsi_node_attrib *na; 341 struct iscsi_session *sess = conn->sess; 342 unsigned char buf[32]; 343 bool iser = false; 344 345 sess->tpg = conn->tpg; 346 347 /* 348 * Assign a new TPG Session Handle. Note this is protected with 349 * struct iscsi_portal_group->np_login_sem from iscsit_access_np(). 350 */ 351 sess->tsih = ++ISCSI_TPG_S(sess)->ntsih; 352 if (!sess->tsih) 353 sess->tsih = ++ISCSI_TPG_S(sess)->ntsih; 354 355 /* 356 * Create the default params from user defined values.. 357 */ 358 if (iscsi_copy_param_list(&conn->param_list, 359 ISCSI_TPG_C(conn)->param_list, 1) < 0) { 360 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 361 ISCSI_LOGIN_STATUS_NO_RESOURCES); 362 return -1; 363 } 364 365 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) 366 iser = true; 367 368 iscsi_set_keys_to_negotiate(conn->param_list, iser); 369 370 if (sess->sess_ops->SessionType) 371 return iscsi_set_keys_irrelevant_for_discovery( 372 conn->param_list); 373 374 na = iscsit_tpg_get_node_attrib(sess); 375 376 /* 377 * Need to send TargetPortalGroupTag back in first login response 378 * on any iSCSI connection where the Initiator provides TargetName. 379 * See 5.3.1. Login Phase Start 380 * 381 * In our case, we have already located the struct iscsi_tiqn at this point. 382 */ 383 memset(buf, 0, 32); 384 sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt); 385 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) { 386 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 387 ISCSI_LOGIN_STATUS_NO_RESOURCES); 388 return -1; 389 } 390 391 /* 392 * Workaround for Initiators that have broken connection recovery logic. 393 * 394 * "We would really like to get rid of this." Linux-iSCSI.org team 395 */ 396 memset(buf, 0, 32); 397 sprintf(buf, "ErrorRecoveryLevel=%d", na->default_erl); 398 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) { 399 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 400 ISCSI_LOGIN_STATUS_NO_RESOURCES); 401 return -1; 402 } 403 404 if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0) 405 return -1; 406 /* 407 * Set RDMAExtensions=Yes by default for iSER enabled network portals 408 */ 409 if (iser) { 410 struct iscsi_param *param; 411 unsigned long mrdsl, off; 412 int rc; 413 414 sprintf(buf, "RDMAExtensions=Yes"); 415 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) { 416 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 417 ISCSI_LOGIN_STATUS_NO_RESOURCES); 418 return -1; 419 } 420 /* 421 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for 422 * Immediate Data + Unsolicitied Data-OUT if necessary.. 423 */ 424 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength", 425 conn->param_list); 426 if (!param) { 427 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 428 ISCSI_LOGIN_STATUS_NO_RESOURCES); 429 return -1; 430 } 431 rc = strict_strtoul(param->value, 0, &mrdsl); 432 if (rc < 0) { 433 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 434 ISCSI_LOGIN_STATUS_NO_RESOURCES); 435 return -1; 436 } 437 off = mrdsl % PAGE_SIZE; 438 if (!off) 439 return 0; 440 441 if (mrdsl < PAGE_SIZE) 442 mrdsl = PAGE_SIZE; 443 else 444 mrdsl -= off; 445 446 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down" 447 " to PAGE_SIZE\n", mrdsl); 448 449 sprintf(buf, "MaxRecvDataSegmentLength=%lu\n", mrdsl); 450 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) { 451 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 452 ISCSI_LOGIN_STATUS_NO_RESOURCES); 453 return -1; 454 } 455 } 456 457 return 0; 458 } 459 460 /* 461 * Remove PSTATE_NEGOTIATE for the four FIM related keys. 462 * The Initiator node will be able to enable FIM by proposing them itself. 463 */ 464 int iscsi_login_disable_FIM_keys( 465 struct iscsi_param_list *param_list, 466 struct iscsi_conn *conn) 467 { 468 struct iscsi_param *param; 469 470 param = iscsi_find_param_from_key("OFMarker", param_list); 471 if (!param) { 472 pr_err("iscsi_find_param_from_key() for" 473 " OFMarker failed\n"); 474 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 475 ISCSI_LOGIN_STATUS_NO_RESOURCES); 476 return -1; 477 } 478 param->state &= ~PSTATE_NEGOTIATE; 479 480 param = iscsi_find_param_from_key("OFMarkInt", param_list); 481 if (!param) { 482 pr_err("iscsi_find_param_from_key() for" 483 " IFMarker failed\n"); 484 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 485 ISCSI_LOGIN_STATUS_NO_RESOURCES); 486 return -1; 487 } 488 param->state &= ~PSTATE_NEGOTIATE; 489 490 param = iscsi_find_param_from_key("IFMarker", param_list); 491 if (!param) { 492 pr_err("iscsi_find_param_from_key() for" 493 " IFMarker failed\n"); 494 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 495 ISCSI_LOGIN_STATUS_NO_RESOURCES); 496 return -1; 497 } 498 param->state &= ~PSTATE_NEGOTIATE; 499 500 param = iscsi_find_param_from_key("IFMarkInt", param_list); 501 if (!param) { 502 pr_err("iscsi_find_param_from_key() for" 503 " IFMarker failed\n"); 504 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 505 ISCSI_LOGIN_STATUS_NO_RESOURCES); 506 return -1; 507 } 508 param->state &= ~PSTATE_NEGOTIATE; 509 510 return 0; 511 } 512 513 static int iscsi_login_non_zero_tsih_s1( 514 struct iscsi_conn *conn, 515 unsigned char *buf) 516 { 517 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf; 518 519 iscsi_login_set_conn_values(NULL, conn, pdu->cid); 520 return 0; 521 } 522 523 /* 524 * Add a new connection to an existing session. 525 */ 526 static int iscsi_login_non_zero_tsih_s2( 527 struct iscsi_conn *conn, 528 unsigned char *buf) 529 { 530 struct iscsi_portal_group *tpg = conn->tpg; 531 struct iscsi_session *sess = NULL, *sess_p = NULL; 532 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 533 struct se_session *se_sess, *se_sess_tmp; 534 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf; 535 bool iser = false; 536 537 spin_lock_bh(&se_tpg->session_lock); 538 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 539 sess_list) { 540 541 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr; 542 if (atomic_read(&sess_p->session_fall_back_to_erl0) || 543 atomic_read(&sess_p->session_logout) || 544 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) 545 continue; 546 if (!memcmp(sess_p->isid, pdu->isid, 6) && 547 (sess_p->tsih == be16_to_cpu(pdu->tsih))) { 548 iscsit_inc_session_usage_count(sess_p); 549 iscsit_stop_time2retain_timer(sess_p); 550 sess = sess_p; 551 break; 552 } 553 } 554 spin_unlock_bh(&se_tpg->session_lock); 555 556 /* 557 * If the Time2Retain handler has expired, the session is already gone. 558 */ 559 if (!sess) { 560 pr_err("Initiator attempting to add a connection to" 561 " a non-existent session, rejecting iSCSI Login.\n"); 562 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 563 ISCSI_LOGIN_STATUS_NO_SESSION); 564 return -1; 565 } 566 567 /* 568 * Stop the Time2Retain timer if this is a failed session, we restart 569 * the timer if the login is not successful. 570 */ 571 spin_lock_bh(&sess->conn_lock); 572 if (sess->session_state == TARG_SESS_STATE_FAILED) 573 atomic_set(&sess->session_continuation, 1); 574 spin_unlock_bh(&sess->conn_lock); 575 576 iscsi_login_set_conn_values(sess, conn, pdu->cid); 577 578 if (iscsi_copy_param_list(&conn->param_list, 579 ISCSI_TPG_C(conn)->param_list, 0) < 0) { 580 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 581 ISCSI_LOGIN_STATUS_NO_RESOURCES); 582 return -1; 583 } 584 585 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) 586 iser = true; 587 588 iscsi_set_keys_to_negotiate(conn->param_list, iser); 589 /* 590 * Need to send TargetPortalGroupTag back in first login response 591 * on any iSCSI connection where the Initiator provides TargetName. 592 * See 5.3.1. Login Phase Start 593 * 594 * In our case, we have already located the struct iscsi_tiqn at this point. 595 */ 596 memset(buf, 0, 32); 597 sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt); 598 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) { 599 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 600 ISCSI_LOGIN_STATUS_NO_RESOURCES); 601 return -1; 602 } 603 604 return iscsi_login_disable_FIM_keys(conn->param_list, conn); 605 } 606 607 int iscsi_login_post_auth_non_zero_tsih( 608 struct iscsi_conn *conn, 609 u16 cid, 610 u32 exp_statsn) 611 { 612 struct iscsi_conn *conn_ptr = NULL; 613 struct iscsi_conn_recovery *cr = NULL; 614 struct iscsi_session *sess = conn->sess; 615 616 /* 617 * By following item 5 in the login table, if we have found 618 * an existing ISID and a valid/existing TSIH and an existing 619 * CID we do connection reinstatement. Currently we dont not 620 * support it so we send back an non-zero status class to the 621 * initiator and release the new connection. 622 */ 623 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid); 624 if (conn_ptr) { 625 pr_err("Connection exists with CID %hu for %s," 626 " performing connection reinstatement.\n", 627 conn_ptr->cid, sess->sess_ops->InitiatorName); 628 629 iscsit_connection_reinstatement_rcfr(conn_ptr); 630 iscsit_dec_conn_usage_count(conn_ptr); 631 } 632 633 /* 634 * Check for any connection recovery entires containing CID. 635 * We use the original ExpStatSN sent in the first login request 636 * to acknowledge commands for the failed connection. 637 * 638 * Also note that an explict logout may have already been sent, 639 * but the response may not be sent due to additional connection 640 * loss. 641 */ 642 if (sess->sess_ops->ErrorRecoveryLevel == 2) { 643 cr = iscsit_get_inactive_connection_recovery_entry( 644 sess, cid); 645 if (cr) { 646 pr_debug("Performing implicit logout" 647 " for connection recovery on CID: %hu\n", 648 conn->cid); 649 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn); 650 } 651 } 652 653 /* 654 * Else we follow item 4 from the login table in that we have 655 * found an existing ISID and a valid/existing TSIH and a new 656 * CID we go ahead and continue to add a new connection to the 657 * session. 658 */ 659 pr_debug("Adding CID %hu to existing session for %s.\n", 660 cid, sess->sess_ops->InitiatorName); 661 662 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) { 663 pr_err("Adding additional connection to this session" 664 " would exceed MaxConnections %d, login failed.\n", 665 sess->sess_ops->MaxConnections); 666 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 667 ISCSI_LOGIN_STATUS_ISID_ERROR); 668 return -1; 669 } 670 671 return 0; 672 } 673 674 static void iscsi_post_login_start_timers(struct iscsi_conn *conn) 675 { 676 struct iscsi_session *sess = conn->sess; 677 /* 678 * FIXME: Unsolicitied NopIN support for ISER 679 */ 680 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) 681 return; 682 683 if (!sess->sess_ops->SessionType) 684 iscsit_start_nopin_timer(conn); 685 } 686 687 static int iscsi_post_login_handler( 688 struct iscsi_np *np, 689 struct iscsi_conn *conn, 690 u8 zero_tsih) 691 { 692 int stop_timer = 0; 693 struct iscsi_session *sess = conn->sess; 694 struct se_session *se_sess = sess->se_sess; 695 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess); 696 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 697 struct iscsi_thread_set *ts; 698 699 iscsit_inc_conn_usage_count(conn); 700 701 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS, 702 ISCSI_LOGIN_STATUS_ACCEPT); 703 704 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n"); 705 conn->conn_state = TARG_CONN_STATE_LOGGED_IN; 706 707 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list); 708 iscsit_set_sync_and_steering_values(conn); 709 /* 710 * SCSI Initiator -> SCSI Target Port Mapping 711 */ 712 ts = iscsi_get_thread_set(); 713 if (!zero_tsih) { 714 iscsi_set_session_parameters(sess->sess_ops, 715 conn->param_list, 0); 716 iscsi_release_param_list(conn->param_list); 717 conn->param_list = NULL; 718 719 spin_lock_bh(&sess->conn_lock); 720 atomic_set(&sess->session_continuation, 0); 721 if (sess->session_state == TARG_SESS_STATE_FAILED) { 722 pr_debug("Moving to" 723 " TARG_SESS_STATE_LOGGED_IN.\n"); 724 sess->session_state = TARG_SESS_STATE_LOGGED_IN; 725 stop_timer = 1; 726 } 727 728 pr_debug("iSCSI Login successful on CID: %hu from %s to" 729 " %s:%hu,%hu\n", conn->cid, conn->login_ip, 730 conn->local_ip, conn->local_port, tpg->tpgt); 731 732 list_add_tail(&conn->conn_list, &sess->sess_conn_list); 733 atomic_inc(&sess->nconn); 734 pr_debug("Incremented iSCSI Connection count to %hu" 735 " from node: %s\n", atomic_read(&sess->nconn), 736 sess->sess_ops->InitiatorName); 737 spin_unlock_bh(&sess->conn_lock); 738 739 iscsi_post_login_start_timers(conn); 740 741 iscsi_activate_thread_set(conn, ts); 742 /* 743 * Determine CPU mask to ensure connection's RX and TX kthreads 744 * are scheduled on the same CPU. 745 */ 746 iscsit_thread_get_cpumask(conn); 747 conn->conn_rx_reset_cpumask = 1; 748 conn->conn_tx_reset_cpumask = 1; 749 750 iscsit_dec_conn_usage_count(conn); 751 if (stop_timer) { 752 spin_lock_bh(&se_tpg->session_lock); 753 iscsit_stop_time2retain_timer(sess); 754 spin_unlock_bh(&se_tpg->session_lock); 755 } 756 iscsit_dec_session_usage_count(sess); 757 return 0; 758 } 759 760 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1); 761 iscsi_release_param_list(conn->param_list); 762 conn->param_list = NULL; 763 764 iscsit_determine_maxcmdsn(sess); 765 766 spin_lock_bh(&se_tpg->session_lock); 767 __transport_register_session(&sess->tpg->tpg_se_tpg, 768 se_sess->se_node_acl, se_sess, sess); 769 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n"); 770 sess->session_state = TARG_SESS_STATE_LOGGED_IN; 771 772 pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n", 773 conn->cid, conn->login_ip, conn->local_ip, conn->local_port, 774 tpg->tpgt); 775 776 spin_lock_bh(&sess->conn_lock); 777 list_add_tail(&conn->conn_list, &sess->sess_conn_list); 778 atomic_inc(&sess->nconn); 779 pr_debug("Incremented iSCSI Connection count to %hu from node:" 780 " %s\n", atomic_read(&sess->nconn), 781 sess->sess_ops->InitiatorName); 782 spin_unlock_bh(&sess->conn_lock); 783 784 sess->sid = tpg->sid++; 785 if (!sess->sid) 786 sess->sid = tpg->sid++; 787 pr_debug("Established iSCSI session from node: %s\n", 788 sess->sess_ops->InitiatorName); 789 790 tpg->nsessions++; 791 if (tpg->tpg_tiqn) 792 tpg->tpg_tiqn->tiqn_nsessions++; 793 794 pr_debug("Incremented number of active iSCSI sessions to %u on" 795 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt); 796 spin_unlock_bh(&se_tpg->session_lock); 797 798 iscsi_post_login_start_timers(conn); 799 iscsi_activate_thread_set(conn, ts); 800 /* 801 * Determine CPU mask to ensure connection's RX and TX kthreads 802 * are scheduled on the same CPU. 803 */ 804 iscsit_thread_get_cpumask(conn); 805 conn->conn_rx_reset_cpumask = 1; 806 conn->conn_tx_reset_cpumask = 1; 807 808 iscsit_dec_conn_usage_count(conn); 809 810 return 0; 811 } 812 813 static void iscsi_handle_login_thread_timeout(unsigned long data) 814 { 815 struct iscsi_np *np = (struct iscsi_np *) data; 816 817 spin_lock_bh(&np->np_thread_lock); 818 pr_err("iSCSI Login timeout on Network Portal %s:%hu\n", 819 np->np_ip, np->np_port); 820 821 if (np->np_login_timer_flags & ISCSI_TF_STOP) { 822 spin_unlock_bh(&np->np_thread_lock); 823 return; 824 } 825 826 if (np->np_thread) 827 send_sig(SIGINT, np->np_thread, 1); 828 829 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING; 830 spin_unlock_bh(&np->np_thread_lock); 831 } 832 833 static void iscsi_start_login_thread_timer(struct iscsi_np *np) 834 { 835 /* 836 * This used the TA_LOGIN_TIMEOUT constant because at this 837 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout 838 */ 839 spin_lock_bh(&np->np_thread_lock); 840 init_timer(&np->np_login_timer); 841 np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ); 842 np->np_login_timer.data = (unsigned long)np; 843 np->np_login_timer.function = iscsi_handle_login_thread_timeout; 844 np->np_login_timer_flags &= ~ISCSI_TF_STOP; 845 np->np_login_timer_flags |= ISCSI_TF_RUNNING; 846 add_timer(&np->np_login_timer); 847 848 pr_debug("Added timeout timer to iSCSI login request for" 849 " %u seconds.\n", TA_LOGIN_TIMEOUT); 850 spin_unlock_bh(&np->np_thread_lock); 851 } 852 853 static void iscsi_stop_login_thread_timer(struct iscsi_np *np) 854 { 855 spin_lock_bh(&np->np_thread_lock); 856 if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) { 857 spin_unlock_bh(&np->np_thread_lock); 858 return; 859 } 860 np->np_login_timer_flags |= ISCSI_TF_STOP; 861 spin_unlock_bh(&np->np_thread_lock); 862 863 del_timer_sync(&np->np_login_timer); 864 865 spin_lock_bh(&np->np_thread_lock); 866 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING; 867 spin_unlock_bh(&np->np_thread_lock); 868 } 869 870 int iscsit_setup_np( 871 struct iscsi_np *np, 872 struct __kernel_sockaddr_storage *sockaddr) 873 { 874 struct socket *sock = NULL; 875 int backlog = 5, ret, opt = 0, len; 876 877 switch (np->np_network_transport) { 878 case ISCSI_TCP: 879 np->np_ip_proto = IPPROTO_TCP; 880 np->np_sock_type = SOCK_STREAM; 881 break; 882 case ISCSI_SCTP_TCP: 883 np->np_ip_proto = IPPROTO_SCTP; 884 np->np_sock_type = SOCK_STREAM; 885 break; 886 case ISCSI_SCTP_UDP: 887 np->np_ip_proto = IPPROTO_SCTP; 888 np->np_sock_type = SOCK_SEQPACKET; 889 break; 890 default: 891 pr_err("Unsupported network_transport: %d\n", 892 np->np_network_transport); 893 return -EINVAL; 894 } 895 896 np->np_ip_proto = IPPROTO_TCP; 897 np->np_sock_type = SOCK_STREAM; 898 899 ret = sock_create(sockaddr->ss_family, np->np_sock_type, 900 np->np_ip_proto, &sock); 901 if (ret < 0) { 902 pr_err("sock_create() failed.\n"); 903 return ret; 904 } 905 np->np_socket = sock; 906 /* 907 * Setup the np->np_sockaddr from the passed sockaddr setup 908 * in iscsi_target_configfs.c code.. 909 */ 910 memcpy(&np->np_sockaddr, sockaddr, 911 sizeof(struct __kernel_sockaddr_storage)); 912 913 if (sockaddr->ss_family == AF_INET6) 914 len = sizeof(struct sockaddr_in6); 915 else 916 len = sizeof(struct sockaddr_in); 917 /* 918 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY. 919 */ 920 /* FIXME: Someone please explain why this is endian-safe */ 921 opt = 1; 922 if (np->np_network_transport == ISCSI_TCP) { 923 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, 924 (char *)&opt, sizeof(opt)); 925 if (ret < 0) { 926 pr_err("kernel_setsockopt() for TCP_NODELAY" 927 " failed: %d\n", ret); 928 goto fail; 929 } 930 } 931 932 /* FIXME: Someone please explain why this is endian-safe */ 933 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, 934 (char *)&opt, sizeof(opt)); 935 if (ret < 0) { 936 pr_err("kernel_setsockopt() for SO_REUSEADDR" 937 " failed\n"); 938 goto fail; 939 } 940 941 ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND, 942 (char *)&opt, sizeof(opt)); 943 if (ret < 0) { 944 pr_err("kernel_setsockopt() for IP_FREEBIND" 945 " failed\n"); 946 goto fail; 947 } 948 949 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len); 950 if (ret < 0) { 951 pr_err("kernel_bind() failed: %d\n", ret); 952 goto fail; 953 } 954 955 ret = kernel_listen(sock, backlog); 956 if (ret != 0) { 957 pr_err("kernel_listen() failed: %d\n", ret); 958 goto fail; 959 } 960 961 return 0; 962 fail: 963 np->np_socket = NULL; 964 if (sock) 965 sock_release(sock); 966 return ret; 967 } 968 969 int iscsi_target_setup_login_socket( 970 struct iscsi_np *np, 971 struct __kernel_sockaddr_storage *sockaddr) 972 { 973 struct iscsit_transport *t; 974 int rc; 975 976 t = iscsit_get_transport(np->np_network_transport); 977 if (!t) 978 return -EINVAL; 979 980 rc = t->iscsit_setup_np(np, sockaddr); 981 if (rc < 0) { 982 iscsit_put_transport(t); 983 return rc; 984 } 985 986 np->np_transport = t; 987 return 0; 988 } 989 990 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn) 991 { 992 struct socket *new_sock, *sock = np->np_socket; 993 struct sockaddr_in sock_in; 994 struct sockaddr_in6 sock_in6; 995 int rc, err; 996 997 rc = kernel_accept(sock, &new_sock, 0); 998 if (rc < 0) 999 return rc; 1000 1001 conn->sock = new_sock; 1002 conn->login_family = np->np_sockaddr.ss_family; 1003 1004 if (np->np_sockaddr.ss_family == AF_INET6) { 1005 memset(&sock_in6, 0, sizeof(struct sockaddr_in6)); 1006 1007 rc = conn->sock->ops->getname(conn->sock, 1008 (struct sockaddr *)&sock_in6, &err, 1); 1009 if (!rc) { 1010 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c", 1011 &sock_in6.sin6_addr.in6_u); 1012 conn->login_port = ntohs(sock_in6.sin6_port); 1013 } 1014 1015 rc = conn->sock->ops->getname(conn->sock, 1016 (struct sockaddr *)&sock_in6, &err, 0); 1017 if (!rc) { 1018 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI6c", 1019 &sock_in6.sin6_addr.in6_u); 1020 conn->local_port = ntohs(sock_in6.sin6_port); 1021 } 1022 } else { 1023 memset(&sock_in, 0, sizeof(struct sockaddr_in)); 1024 1025 rc = conn->sock->ops->getname(conn->sock, 1026 (struct sockaddr *)&sock_in, &err, 1); 1027 if (!rc) { 1028 sprintf(conn->login_ip, "%pI4", 1029 &sock_in.sin_addr.s_addr); 1030 conn->login_port = ntohs(sock_in.sin_port); 1031 } 1032 1033 rc = conn->sock->ops->getname(conn->sock, 1034 (struct sockaddr *)&sock_in, &err, 0); 1035 if (!rc) { 1036 sprintf(conn->local_ip, "%pI4", 1037 &sock_in.sin_addr.s_addr); 1038 conn->local_port = ntohs(sock_in.sin_port); 1039 } 1040 } 1041 1042 return 0; 1043 } 1044 1045 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login) 1046 { 1047 struct iscsi_login_req *login_req; 1048 u32 padding = 0, payload_length; 1049 1050 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0) 1051 return -1; 1052 1053 login_req = (struct iscsi_login_req *)login->req; 1054 payload_length = ntoh24(login_req->dlength); 1055 padding = ((-payload_length) & 3); 1056 1057 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x," 1058 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n", 1059 login_req->flags, login_req->itt, login_req->cmdsn, 1060 login_req->exp_statsn, login_req->cid, payload_length); 1061 /* 1062 * Setup the initial iscsi_login values from the leading 1063 * login request PDU. 1064 */ 1065 if (login->first_request) { 1066 login_req = (struct iscsi_login_req *)login->req; 1067 login->leading_connection = (!login_req->tsih) ? 1 : 0; 1068 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags); 1069 login->version_min = login_req->min_version; 1070 login->version_max = login_req->max_version; 1071 memcpy(login->isid, login_req->isid, 6); 1072 login->cmd_sn = be32_to_cpu(login_req->cmdsn); 1073 login->init_task_tag = login_req->itt; 1074 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn); 1075 login->cid = be16_to_cpu(login_req->cid); 1076 login->tsih = be16_to_cpu(login_req->tsih); 1077 } 1078 1079 if (iscsi_target_check_login_request(conn, login) < 0) 1080 return -1; 1081 1082 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS); 1083 if (iscsi_login_rx_data(conn, login->req_buf, 1084 payload_length + padding) < 0) 1085 return -1; 1086 1087 return 0; 1088 } 1089 1090 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login, 1091 u32 length) 1092 { 1093 if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0) 1094 return -1; 1095 1096 return 0; 1097 } 1098 1099 static int 1100 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t) 1101 { 1102 int rc; 1103 1104 if (!t->owner) { 1105 conn->conn_transport = t; 1106 return 0; 1107 } 1108 1109 rc = try_module_get(t->owner); 1110 if (!rc) { 1111 pr_err("try_module_get() failed for %s\n", t->name); 1112 return -EINVAL; 1113 } 1114 1115 conn->conn_transport = t; 1116 return 0; 1117 } 1118 1119 static int __iscsi_target_login_thread(struct iscsi_np *np) 1120 { 1121 u8 *buffer, zero_tsih = 0; 1122 int ret = 0, rc, stop; 1123 struct iscsi_conn *conn = NULL; 1124 struct iscsi_login *login; 1125 struct iscsi_portal_group *tpg = NULL; 1126 struct iscsi_login_req *pdu; 1127 1128 flush_signals(current); 1129 1130 spin_lock_bh(&np->np_thread_lock); 1131 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) { 1132 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; 1133 complete(&np->np_restart_comp); 1134 } else { 1135 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; 1136 } 1137 spin_unlock_bh(&np->np_thread_lock); 1138 1139 conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL); 1140 if (!conn) { 1141 pr_err("Could not allocate memory for" 1142 " new connection\n"); 1143 /* Get another socket */ 1144 return 1; 1145 } 1146 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 1147 conn->conn_state = TARG_CONN_STATE_FREE; 1148 1149 if (iscsit_conn_set_transport(conn, np->np_transport) < 0) { 1150 kfree(conn); 1151 return 1; 1152 } 1153 1154 rc = np->np_transport->iscsit_accept_np(np, conn); 1155 if (rc == -ENOSYS) { 1156 complete(&np->np_restart_comp); 1157 iscsit_put_transport(conn->conn_transport); 1158 kfree(conn); 1159 conn = NULL; 1160 goto exit; 1161 } else if (rc < 0) { 1162 spin_lock_bh(&np->np_thread_lock); 1163 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) { 1164 spin_unlock_bh(&np->np_thread_lock); 1165 complete(&np->np_restart_comp); 1166 if (ret == -ENODEV) { 1167 iscsit_put_transport(conn->conn_transport); 1168 kfree(conn); 1169 conn = NULL; 1170 goto out; 1171 } 1172 /* Get another socket */ 1173 return 1; 1174 } 1175 spin_unlock_bh(&np->np_thread_lock); 1176 iscsit_put_transport(conn->conn_transport); 1177 kfree(conn); 1178 conn = NULL; 1179 goto out; 1180 } 1181 /* 1182 * Perform the remaining iSCSI connection initialization items.. 1183 */ 1184 login = iscsi_login_init_conn(conn); 1185 if (!login) { 1186 goto new_sess_out; 1187 } 1188 1189 iscsi_start_login_thread_timer(np); 1190 1191 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n"); 1192 conn->conn_state = TARG_CONN_STATE_XPT_UP; 1193 /* 1194 * This will process the first login request + payload.. 1195 */ 1196 rc = np->np_transport->iscsit_get_login_rx(conn, login); 1197 if (rc == 1) 1198 return 1; 1199 else if (rc < 0) 1200 goto new_sess_out; 1201 1202 buffer = &login->req[0]; 1203 pdu = (struct iscsi_login_req *)buffer; 1204 /* 1205 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs 1206 * when Status-Class != 0. 1207 */ 1208 conn->login_itt = pdu->itt; 1209 1210 spin_lock_bh(&np->np_thread_lock); 1211 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 1212 spin_unlock_bh(&np->np_thread_lock); 1213 pr_err("iSCSI Network Portal on %s:%hu currently not" 1214 " active.\n", np->np_ip, np->np_port); 1215 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1216 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1217 goto new_sess_out; 1218 } 1219 spin_unlock_bh(&np->np_thread_lock); 1220 1221 conn->network_transport = np->np_network_transport; 1222 1223 pr_debug("Received iSCSI login request from %s on %s Network" 1224 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name, 1225 conn->local_ip, conn->local_port); 1226 1227 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n"); 1228 conn->conn_state = TARG_CONN_STATE_IN_LOGIN; 1229 1230 if (iscsi_login_check_initiator_version(conn, pdu->max_version, 1231 pdu->min_version) < 0) 1232 goto new_sess_out; 1233 1234 zero_tsih = (pdu->tsih == 0x0000); 1235 if (zero_tsih) { 1236 /* 1237 * This is the leading connection of a new session. 1238 * We wait until after authentication to check for 1239 * session reinstatement. 1240 */ 1241 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0) 1242 goto new_sess_out; 1243 } else { 1244 /* 1245 * Add a new connection to an existing session. 1246 * We check for a non-existant session in 1247 * iscsi_login_non_zero_tsih_s2() below based 1248 * on ISID/TSIH, but wait until after authentication 1249 * to check for connection reinstatement, etc. 1250 */ 1251 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0) 1252 goto new_sess_out; 1253 } 1254 /* 1255 * SessionType: Discovery 1256 * 1257 * Locates Default Portal 1258 * 1259 * SessionType: Normal 1260 * 1261 * Locates Target Portal from NP -> Target IQN 1262 */ 1263 rc = iscsi_target_locate_portal(np, conn, login); 1264 if (rc < 0) { 1265 tpg = conn->tpg; 1266 goto new_sess_out; 1267 } 1268 1269 tpg = conn->tpg; 1270 if (!tpg) { 1271 pr_err("Unable to locate struct iscsi_conn->tpg\n"); 1272 goto new_sess_out; 1273 } 1274 1275 if (zero_tsih) { 1276 if (iscsi_login_zero_tsih_s2(conn) < 0) 1277 goto new_sess_out; 1278 } else { 1279 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0) 1280 goto old_sess_out; 1281 } 1282 1283 if (iscsi_target_start_negotiation(login, conn) < 0) 1284 goto new_sess_out; 1285 1286 if (!conn->sess) { 1287 pr_err("struct iscsi_conn session pointer is NULL!\n"); 1288 goto new_sess_out; 1289 } 1290 1291 iscsi_stop_login_thread_timer(np); 1292 1293 if (signal_pending(current)) 1294 goto new_sess_out; 1295 1296 ret = iscsi_post_login_handler(np, conn, zero_tsih); 1297 1298 if (ret < 0) 1299 goto new_sess_out; 1300 1301 iscsit_deaccess_np(np, tpg); 1302 tpg = NULL; 1303 /* Get another socket */ 1304 return 1; 1305 1306 new_sess_out: 1307 pr_err("iSCSI Login negotiation failed.\n"); 1308 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1309 ISCSI_LOGIN_STATUS_INIT_ERR); 1310 if (!zero_tsih || !conn->sess) 1311 goto old_sess_out; 1312 if (conn->sess->se_sess) 1313 transport_free_session(conn->sess->se_sess); 1314 if (conn->sess->session_index != 0) { 1315 spin_lock_bh(&sess_idr_lock); 1316 idr_remove(&sess_idr, conn->sess->session_index); 1317 spin_unlock_bh(&sess_idr_lock); 1318 } 1319 kfree(conn->sess->sess_ops); 1320 kfree(conn->sess); 1321 old_sess_out: 1322 iscsi_stop_login_thread_timer(np); 1323 /* 1324 * If login negotiation fails check if the Time2Retain timer 1325 * needs to be restarted. 1326 */ 1327 if (!zero_tsih && conn->sess) { 1328 spin_lock_bh(&conn->sess->conn_lock); 1329 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) { 1330 struct se_portal_group *se_tpg = 1331 &ISCSI_TPG_C(conn)->tpg_se_tpg; 1332 1333 atomic_set(&conn->sess->session_continuation, 0); 1334 spin_unlock_bh(&conn->sess->conn_lock); 1335 spin_lock_bh(&se_tpg->session_lock); 1336 iscsit_start_time2retain_handler(conn->sess); 1337 spin_unlock_bh(&se_tpg->session_lock); 1338 } else 1339 spin_unlock_bh(&conn->sess->conn_lock); 1340 iscsit_dec_session_usage_count(conn->sess); 1341 } 1342 1343 if (!IS_ERR(conn->conn_rx_hash.tfm)) 1344 crypto_free_hash(conn->conn_rx_hash.tfm); 1345 if (!IS_ERR(conn->conn_tx_hash.tfm)) 1346 crypto_free_hash(conn->conn_tx_hash.tfm); 1347 1348 if (conn->conn_cpumask) 1349 free_cpumask_var(conn->conn_cpumask); 1350 1351 kfree(conn->conn_ops); 1352 1353 if (conn->param_list) { 1354 iscsi_release_param_list(conn->param_list); 1355 conn->param_list = NULL; 1356 } 1357 iscsi_target_nego_release(conn); 1358 1359 if (conn->sock) { 1360 sock_release(conn->sock); 1361 conn->sock = NULL; 1362 } 1363 1364 if (conn->conn_transport->iscsit_free_conn) 1365 conn->conn_transport->iscsit_free_conn(conn); 1366 1367 iscsit_put_transport(conn->conn_transport); 1368 1369 kfree(conn); 1370 1371 if (tpg) { 1372 iscsit_deaccess_np(np, tpg); 1373 tpg = NULL; 1374 } 1375 1376 out: 1377 stop = kthread_should_stop(); 1378 if (!stop && signal_pending(current)) { 1379 spin_lock_bh(&np->np_thread_lock); 1380 stop = (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN); 1381 spin_unlock_bh(&np->np_thread_lock); 1382 } 1383 /* Wait for another socket.. */ 1384 if (!stop) 1385 return 1; 1386 exit: 1387 iscsi_stop_login_thread_timer(np); 1388 spin_lock_bh(&np->np_thread_lock); 1389 np->np_thread_state = ISCSI_NP_THREAD_EXIT; 1390 np->np_thread = NULL; 1391 spin_unlock_bh(&np->np_thread_lock); 1392 1393 return 0; 1394 } 1395 1396 int iscsi_target_login_thread(void *arg) 1397 { 1398 struct iscsi_np *np = arg; 1399 int ret; 1400 1401 allow_signal(SIGINT); 1402 1403 while (!kthread_should_stop()) { 1404 ret = __iscsi_target_login_thread(np); 1405 /* 1406 * We break and exit here unless another sock_accept() call 1407 * is expected. 1408 */ 1409 if (ret != 1) 1410 break; 1411 } 1412 1413 return 0; 1414 } 1415