iscsi_target_login.c revision 79d59d08082dd0a0a18f8ceb78c99f9f321d72aa
1/******************************************************************************* 2 * This file contains the login functions used by the iSCSI Target driver. 3 * 4 * (c) Copyright 2007-2013 Datera, Inc. 5 * 6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 ******************************************************************************/ 18 19#include <linux/string.h> 20#include <linux/kthread.h> 21#include <linux/crypto.h> 22#include <linux/idr.h> 23#include <scsi/iscsi_proto.h> 24#include <target/target_core_base.h> 25#include <target/target_core_fabric.h> 26 27#include "iscsi_target_core.h" 28#include "iscsi_target_tq.h" 29#include "iscsi_target_device.h" 30#include "iscsi_target_nego.h" 31#include "iscsi_target_erl0.h" 32#include "iscsi_target_erl2.h" 33#include "iscsi_target_login.h" 34#include "iscsi_target_stat.h" 35#include "iscsi_target_tpg.h" 36#include "iscsi_target_util.h" 37#include "iscsi_target.h" 38#include "iscsi_target_parameters.h" 39 40#include <target/iscsi/iscsi_transport.h> 41 42static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn) 43{ 44 struct iscsi_login *login; 45 46 login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL); 47 if (!login) { 48 pr_err("Unable to allocate memory for struct iscsi_login.\n"); 49 return NULL; 50 } 51 conn->login = login; 52 login->conn = conn; 53 login->first_request = 1; 54 55 login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL); 56 if (!login->req_buf) { 57 pr_err("Unable to allocate memory for response buffer.\n"); 58 goto out_login; 59 } 60 61 login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL); 62 if (!login->rsp_buf) { 63 pr_err("Unable to allocate memory for request buffer.\n"); 64 goto out_req_buf; 65 } 66 67 conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL); 68 if (!conn->conn_ops) { 69 pr_err("Unable to allocate memory for" 70 " struct iscsi_conn_ops.\n"); 71 goto out_rsp_buf; 72 } 73 74 init_waitqueue_head(&conn->queues_wq); 75 INIT_LIST_HEAD(&conn->conn_list); 76 INIT_LIST_HEAD(&conn->conn_cmd_list); 77 INIT_LIST_HEAD(&conn->immed_queue_list); 78 INIT_LIST_HEAD(&conn->response_queue_list); 79 init_completion(&conn->conn_post_wait_comp); 80 init_completion(&conn->conn_wait_comp); 81 init_completion(&conn->conn_wait_rcfr_comp); 82 init_completion(&conn->conn_waiting_on_uc_comp); 83 init_completion(&conn->conn_logout_comp); 84 init_completion(&conn->rx_half_close_comp); 85 init_completion(&conn->tx_half_close_comp); 86 spin_lock_init(&conn->cmd_lock); 87 spin_lock_init(&conn->conn_usage_lock); 88 spin_lock_init(&conn->immed_queue_lock); 89 spin_lock_init(&conn->nopin_timer_lock); 90 spin_lock_init(&conn->response_queue_lock); 91 spin_lock_init(&conn->state_lock); 92 93 if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) { 94 pr_err("Unable to allocate conn->conn_cpumask\n"); 95 goto out_conn_ops; 96 } 97 conn->conn_login = login; 98 99 return login; 100 101out_conn_ops: 102 kfree(conn->conn_ops); 103out_rsp_buf: 104 kfree(login->rsp_buf); 105out_req_buf: 106 kfree(login->req_buf); 107out_login: 108 kfree(login); 109 return NULL; 110} 111 112/* 113 * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup 114 * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel 115 */ 116int iscsi_login_setup_crypto(struct iscsi_conn *conn) 117{ 118 /* 119 * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts 120 * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback 121 * to software 1x8 byte slicing from crc32c.ko 122 */ 123 conn->conn_rx_hash.flags = 0; 124 conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0, 125 CRYPTO_ALG_ASYNC); 126 if (IS_ERR(conn->conn_rx_hash.tfm)) { 127 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n"); 128 return -ENOMEM; 129 } 130 131 conn->conn_tx_hash.flags = 0; 132 conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0, 133 CRYPTO_ALG_ASYNC); 134 if (IS_ERR(conn->conn_tx_hash.tfm)) { 135 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n"); 136 crypto_free_hash(conn->conn_rx_hash.tfm); 137 return -ENOMEM; 138 } 139 140 return 0; 141} 142 143static int iscsi_login_check_initiator_version( 144 struct iscsi_conn *conn, 145 u8 version_max, 146 u8 version_min) 147{ 148 if ((version_max != 0x00) || (version_min != 0x00)) { 149 pr_err("Unsupported iSCSI IETF Pre-RFC Revision," 150 " version Min/Max 0x%02x/0x%02x, rejecting login.\n", 151 version_min, version_max); 152 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 153 ISCSI_LOGIN_STATUS_NO_VERSION); 154 return -1; 155 } 156 157 return 0; 158} 159 160int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn) 161{ 162 int sessiontype; 163 struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL; 164 struct iscsi_portal_group *tpg = conn->tpg; 165 struct iscsi_session *sess = NULL, *sess_p = NULL; 166 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 167 struct se_session *se_sess, *se_sess_tmp; 168 169 initiatorname_param = iscsi_find_param_from_key( 170 INITIATORNAME, conn->param_list); 171 sessiontype_param = iscsi_find_param_from_key( 172 SESSIONTYPE, conn->param_list); 173 if (!initiatorname_param || !sessiontype_param) { 174 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 175 ISCSI_LOGIN_STATUS_MISSING_FIELDS); 176 return -1; 177 } 178 179 sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0; 180 181 spin_lock_bh(&se_tpg->session_lock); 182 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 183 sess_list) { 184 185 sess_p = se_sess->fabric_sess_ptr; 186 spin_lock(&sess_p->conn_lock); 187 if (atomic_read(&sess_p->session_fall_back_to_erl0) || 188 atomic_read(&sess_p->session_logout) || 189 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) { 190 spin_unlock(&sess_p->conn_lock); 191 continue; 192 } 193 if (!memcmp(sess_p->isid, conn->sess->isid, 6) && 194 (!strcmp(sess_p->sess_ops->InitiatorName, 195 initiatorname_param->value) && 196 (sess_p->sess_ops->SessionType == sessiontype))) { 197 atomic_set(&sess_p->session_reinstatement, 1); 198 spin_unlock(&sess_p->conn_lock); 199 iscsit_inc_session_usage_count(sess_p); 200 iscsit_stop_time2retain_timer(sess_p); 201 sess = sess_p; 202 break; 203 } 204 spin_unlock(&sess_p->conn_lock); 205 } 206 spin_unlock_bh(&se_tpg->session_lock); 207 /* 208 * If the Time2Retain handler has expired, the session is already gone. 209 */ 210 if (!sess) 211 return 0; 212 213 pr_debug("%s iSCSI Session SID %u is still active for %s," 214 " preforming session reinstatement.\n", (sessiontype) ? 215 "Discovery" : "Normal", sess->sid, 216 sess->sess_ops->InitiatorName); 217 218 spin_lock_bh(&sess->conn_lock); 219 if (sess->session_state == TARG_SESS_STATE_FAILED) { 220 spin_unlock_bh(&sess->conn_lock); 221 iscsit_dec_session_usage_count(sess); 222 target_put_session(sess->se_sess); 223 return 0; 224 } 225 spin_unlock_bh(&sess->conn_lock); 226 227 iscsit_stop_session(sess, 1, 1); 228 iscsit_dec_session_usage_count(sess); 229 230 target_put_session(sess->se_sess); 231 return 0; 232} 233 234static void iscsi_login_set_conn_values( 235 struct iscsi_session *sess, 236 struct iscsi_conn *conn, 237 __be16 cid) 238{ 239 conn->sess = sess; 240 conn->cid = be16_to_cpu(cid); 241 /* 242 * Generate a random Status sequence number (statsn) for the new 243 * iSCSI connection. 244 */ 245 get_random_bytes(&conn->stat_sn, sizeof(u32)); 246 247 mutex_lock(&auth_id_lock); 248 conn->auth_id = iscsit_global->auth_id++; 249 mutex_unlock(&auth_id_lock); 250} 251 252static __printf(2, 3) int iscsi_change_param_sprintf( 253 struct iscsi_conn *conn, 254 const char *fmt, ...) 255{ 256 va_list args; 257 unsigned char buf[64]; 258 259 memset(buf, 0, sizeof buf); 260 261 va_start(args, fmt); 262 vsnprintf(buf, sizeof buf, fmt, args); 263 va_end(args); 264 265 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) { 266 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 267 ISCSI_LOGIN_STATUS_NO_RESOURCES); 268 return -1; 269 } 270 271 return 0; 272} 273 274/* 275 * This is the leading connection of a new session, 276 * or session reinstatement. 277 */ 278static int iscsi_login_zero_tsih_s1( 279 struct iscsi_conn *conn, 280 unsigned char *buf) 281{ 282 struct iscsi_session *sess = NULL; 283 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf; 284 enum target_prot_op sup_pro_ops; 285 int ret; 286 287 sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL); 288 if (!sess) { 289 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 290 ISCSI_LOGIN_STATUS_NO_RESOURCES); 291 pr_err("Could not allocate memory for session\n"); 292 return -ENOMEM; 293 } 294 295 iscsi_login_set_conn_values(sess, conn, pdu->cid); 296 sess->init_task_tag = pdu->itt; 297 memcpy(&sess->isid, pdu->isid, 6); 298 sess->exp_cmd_sn = be32_to_cpu(pdu->cmdsn); 299 INIT_LIST_HEAD(&sess->sess_conn_list); 300 INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list); 301 INIT_LIST_HEAD(&sess->cr_active_list); 302 INIT_LIST_HEAD(&sess->cr_inactive_list); 303 init_completion(&sess->async_msg_comp); 304 init_completion(&sess->reinstatement_comp); 305 init_completion(&sess->session_wait_comp); 306 init_completion(&sess->session_waiting_on_uc_comp); 307 mutex_init(&sess->cmdsn_mutex); 308 spin_lock_init(&sess->conn_lock); 309 spin_lock_init(&sess->cr_a_lock); 310 spin_lock_init(&sess->cr_i_lock); 311 spin_lock_init(&sess->session_usage_lock); 312 spin_lock_init(&sess->ttt_lock); 313 314 idr_preload(GFP_KERNEL); 315 spin_lock_bh(&sess_idr_lock); 316 ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT); 317 if (ret >= 0) 318 sess->session_index = ret; 319 spin_unlock_bh(&sess_idr_lock); 320 idr_preload_end(); 321 322 if (ret < 0) { 323 pr_err("idr_alloc() for sess_idr failed\n"); 324 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 325 ISCSI_LOGIN_STATUS_NO_RESOURCES); 326 kfree(sess); 327 return -ENOMEM; 328 } 329 330 sess->creation_time = get_jiffies_64(); 331 /* 332 * The FFP CmdSN window values will be allocated from the TPG's 333 * Initiator Node's ACL once the login has been successfully completed. 334 */ 335 sess->max_cmd_sn = be32_to_cpu(pdu->cmdsn); 336 337 sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL); 338 if (!sess->sess_ops) { 339 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 340 ISCSI_LOGIN_STATUS_NO_RESOURCES); 341 pr_err("Unable to allocate memory for" 342 " struct iscsi_sess_ops.\n"); 343 kfree(sess); 344 return -ENOMEM; 345 } 346 sup_pro_ops = conn->conn_transport->iscsit_get_sup_prot_ops(conn); 347 348 sess->se_sess = transport_init_session(sup_pro_ops); 349 if (IS_ERR(sess->se_sess)) { 350 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 351 ISCSI_LOGIN_STATUS_NO_RESOURCES); 352 kfree(sess); 353 return -ENOMEM; 354 } 355 356 return 0; 357} 358 359static int iscsi_login_zero_tsih_s2( 360 struct iscsi_conn *conn) 361{ 362 struct iscsi_node_attrib *na; 363 struct iscsi_session *sess = conn->sess; 364 bool iser = false; 365 366 sess->tpg = conn->tpg; 367 368 /* 369 * Assign a new TPG Session Handle. Note this is protected with 370 * struct iscsi_portal_group->np_login_sem from iscsit_access_np(). 371 */ 372 sess->tsih = ++sess->tpg->ntsih; 373 if (!sess->tsih) 374 sess->tsih = ++sess->tpg->ntsih; 375 376 /* 377 * Create the default params from user defined values.. 378 */ 379 if (iscsi_copy_param_list(&conn->param_list, 380 conn->tpg->param_list, 1) < 0) { 381 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 382 ISCSI_LOGIN_STATUS_NO_RESOURCES); 383 return -1; 384 } 385 386 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) 387 iser = true; 388 389 iscsi_set_keys_to_negotiate(conn->param_list, iser); 390 391 if (sess->sess_ops->SessionType) 392 return iscsi_set_keys_irrelevant_for_discovery( 393 conn->param_list); 394 395 na = iscsit_tpg_get_node_attrib(sess); 396 397 /* 398 * Need to send TargetPortalGroupTag back in first login response 399 * on any iSCSI connection where the Initiator provides TargetName. 400 * See 5.3.1. Login Phase Start 401 * 402 * In our case, we have already located the struct iscsi_tiqn at this point. 403 */ 404 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt)) 405 return -1; 406 407 /* 408 * Workaround for Initiators that have broken connection recovery logic. 409 * 410 * "We would really like to get rid of this." Linux-iSCSI.org team 411 */ 412 if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl)) 413 return -1; 414 415 if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0) 416 return -1; 417 /* 418 * Set RDMAExtensions=Yes by default for iSER enabled network portals 419 */ 420 if (iser) { 421 struct iscsi_param *param; 422 unsigned long mrdsl, off; 423 int rc; 424 425 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes")) 426 return -1; 427 428 /* 429 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for 430 * Immediate Data + Unsolicitied Data-OUT if necessary.. 431 */ 432 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength", 433 conn->param_list); 434 if (!param) { 435 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 436 ISCSI_LOGIN_STATUS_NO_RESOURCES); 437 return -1; 438 } 439 rc = kstrtoul(param->value, 0, &mrdsl); 440 if (rc < 0) { 441 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 442 ISCSI_LOGIN_STATUS_NO_RESOURCES); 443 return -1; 444 } 445 off = mrdsl % PAGE_SIZE; 446 if (!off) 447 goto check_prot; 448 449 if (mrdsl < PAGE_SIZE) 450 mrdsl = PAGE_SIZE; 451 else 452 mrdsl -= off; 453 454 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down" 455 " to PAGE_SIZE\n", mrdsl); 456 457 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl)) 458 return -1; 459 /* 460 * ISER currently requires that ImmediateData + Unsolicited 461 * Data be disabled when protection / signature MRs are enabled. 462 */ 463check_prot: 464 if (sess->se_sess->sup_prot_ops & 465 (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS | 466 TARGET_PROT_DOUT_INSERT)) { 467 468 if (iscsi_change_param_sprintf(conn, "ImmediateData=No")) 469 return -1; 470 471 if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes")) 472 return -1; 473 474 pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for" 475 " T10-PI enabled ISER session\n"); 476 } 477 } 478 479 return 0; 480} 481 482/* 483 * Remove PSTATE_NEGOTIATE for the four FIM related keys. 484 * The Initiator node will be able to enable FIM by proposing them itself. 485 */ 486int iscsi_login_disable_FIM_keys( 487 struct iscsi_param_list *param_list, 488 struct iscsi_conn *conn) 489{ 490 struct iscsi_param *param; 491 492 param = iscsi_find_param_from_key("OFMarker", param_list); 493 if (!param) { 494 pr_err("iscsi_find_param_from_key() for" 495 " OFMarker failed\n"); 496 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 497 ISCSI_LOGIN_STATUS_NO_RESOURCES); 498 return -1; 499 } 500 param->state &= ~PSTATE_NEGOTIATE; 501 502 param = iscsi_find_param_from_key("OFMarkInt", param_list); 503 if (!param) { 504 pr_err("iscsi_find_param_from_key() for" 505 " IFMarker failed\n"); 506 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 507 ISCSI_LOGIN_STATUS_NO_RESOURCES); 508 return -1; 509 } 510 param->state &= ~PSTATE_NEGOTIATE; 511 512 param = iscsi_find_param_from_key("IFMarker", param_list); 513 if (!param) { 514 pr_err("iscsi_find_param_from_key() for" 515 " IFMarker failed\n"); 516 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 517 ISCSI_LOGIN_STATUS_NO_RESOURCES); 518 return -1; 519 } 520 param->state &= ~PSTATE_NEGOTIATE; 521 522 param = iscsi_find_param_from_key("IFMarkInt", param_list); 523 if (!param) { 524 pr_err("iscsi_find_param_from_key() for" 525 " IFMarker failed\n"); 526 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 527 ISCSI_LOGIN_STATUS_NO_RESOURCES); 528 return -1; 529 } 530 param->state &= ~PSTATE_NEGOTIATE; 531 532 return 0; 533} 534 535static int iscsi_login_non_zero_tsih_s1( 536 struct iscsi_conn *conn, 537 unsigned char *buf) 538{ 539 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf; 540 541 iscsi_login_set_conn_values(NULL, conn, pdu->cid); 542 return 0; 543} 544 545/* 546 * Add a new connection to an existing session. 547 */ 548static int iscsi_login_non_zero_tsih_s2( 549 struct iscsi_conn *conn, 550 unsigned char *buf) 551{ 552 struct iscsi_portal_group *tpg = conn->tpg; 553 struct iscsi_session *sess = NULL, *sess_p = NULL; 554 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 555 struct se_session *se_sess, *se_sess_tmp; 556 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf; 557 bool iser = false; 558 559 spin_lock_bh(&se_tpg->session_lock); 560 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list, 561 sess_list) { 562 563 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr; 564 if (atomic_read(&sess_p->session_fall_back_to_erl0) || 565 atomic_read(&sess_p->session_logout) || 566 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) 567 continue; 568 if (!memcmp(sess_p->isid, pdu->isid, 6) && 569 (sess_p->tsih == be16_to_cpu(pdu->tsih))) { 570 iscsit_inc_session_usage_count(sess_p); 571 iscsit_stop_time2retain_timer(sess_p); 572 sess = sess_p; 573 break; 574 } 575 } 576 spin_unlock_bh(&se_tpg->session_lock); 577 578 /* 579 * If the Time2Retain handler has expired, the session is already gone. 580 */ 581 if (!sess) { 582 pr_err("Initiator attempting to add a connection to" 583 " a non-existent session, rejecting iSCSI Login.\n"); 584 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 585 ISCSI_LOGIN_STATUS_NO_SESSION); 586 return -1; 587 } 588 589 /* 590 * Stop the Time2Retain timer if this is a failed session, we restart 591 * the timer if the login is not successful. 592 */ 593 spin_lock_bh(&sess->conn_lock); 594 if (sess->session_state == TARG_SESS_STATE_FAILED) 595 atomic_set(&sess->session_continuation, 1); 596 spin_unlock_bh(&sess->conn_lock); 597 598 iscsi_login_set_conn_values(sess, conn, pdu->cid); 599 600 if (iscsi_copy_param_list(&conn->param_list, 601 conn->tpg->param_list, 0) < 0) { 602 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 603 ISCSI_LOGIN_STATUS_NO_RESOURCES); 604 return -1; 605 } 606 607 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) 608 iser = true; 609 610 iscsi_set_keys_to_negotiate(conn->param_list, iser); 611 /* 612 * Need to send TargetPortalGroupTag back in first login response 613 * on any iSCSI connection where the Initiator provides TargetName. 614 * See 5.3.1. Login Phase Start 615 * 616 * In our case, we have already located the struct iscsi_tiqn at this point. 617 */ 618 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt)) 619 return -1; 620 621 return iscsi_login_disable_FIM_keys(conn->param_list, conn); 622} 623 624int iscsi_login_post_auth_non_zero_tsih( 625 struct iscsi_conn *conn, 626 u16 cid, 627 u32 exp_statsn) 628{ 629 struct iscsi_conn *conn_ptr = NULL; 630 struct iscsi_conn_recovery *cr = NULL; 631 struct iscsi_session *sess = conn->sess; 632 633 /* 634 * By following item 5 in the login table, if we have found 635 * an existing ISID and a valid/existing TSIH and an existing 636 * CID we do connection reinstatement. Currently we dont not 637 * support it so we send back an non-zero status class to the 638 * initiator and release the new connection. 639 */ 640 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid); 641 if (conn_ptr) { 642 pr_err("Connection exists with CID %hu for %s," 643 " performing connection reinstatement.\n", 644 conn_ptr->cid, sess->sess_ops->InitiatorName); 645 646 iscsit_connection_reinstatement_rcfr(conn_ptr); 647 iscsit_dec_conn_usage_count(conn_ptr); 648 } 649 650 /* 651 * Check for any connection recovery entires containing CID. 652 * We use the original ExpStatSN sent in the first login request 653 * to acknowledge commands for the failed connection. 654 * 655 * Also note that an explict logout may have already been sent, 656 * but the response may not be sent due to additional connection 657 * loss. 658 */ 659 if (sess->sess_ops->ErrorRecoveryLevel == 2) { 660 cr = iscsit_get_inactive_connection_recovery_entry( 661 sess, cid); 662 if (cr) { 663 pr_debug("Performing implicit logout" 664 " for connection recovery on CID: %hu\n", 665 conn->cid); 666 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn); 667 } 668 } 669 670 /* 671 * Else we follow item 4 from the login table in that we have 672 * found an existing ISID and a valid/existing TSIH and a new 673 * CID we go ahead and continue to add a new connection to the 674 * session. 675 */ 676 pr_debug("Adding CID %hu to existing session for %s.\n", 677 cid, sess->sess_ops->InitiatorName); 678 679 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) { 680 pr_err("Adding additional connection to this session" 681 " would exceed MaxConnections %d, login failed.\n", 682 sess->sess_ops->MaxConnections); 683 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 684 ISCSI_LOGIN_STATUS_ISID_ERROR); 685 return -1; 686 } 687 688 return 0; 689} 690 691static void iscsi_post_login_start_timers(struct iscsi_conn *conn) 692{ 693 struct iscsi_session *sess = conn->sess; 694 /* 695 * FIXME: Unsolicitied NopIN support for ISER 696 */ 697 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) 698 return; 699 700 if (!sess->sess_ops->SessionType) 701 iscsit_start_nopin_timer(conn); 702} 703 704int iscsi_post_login_handler( 705 struct iscsi_np *np, 706 struct iscsi_conn *conn, 707 u8 zero_tsih) 708{ 709 int stop_timer = 0; 710 struct iscsi_session *sess = conn->sess; 711 struct se_session *se_sess = sess->se_sess; 712 struct iscsi_portal_group *tpg = sess->tpg; 713 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg; 714 struct iscsi_thread_set *ts; 715 716 iscsit_inc_conn_usage_count(conn); 717 718 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS, 719 ISCSI_LOGIN_STATUS_ACCEPT); 720 721 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n"); 722 conn->conn_state = TARG_CONN_STATE_LOGGED_IN; 723 724 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list); 725 iscsit_set_sync_and_steering_values(conn); 726 /* 727 * SCSI Initiator -> SCSI Target Port Mapping 728 */ 729 ts = iscsi_get_thread_set(); 730 if (!zero_tsih) { 731 iscsi_set_session_parameters(sess->sess_ops, 732 conn->param_list, 0); 733 iscsi_release_param_list(conn->param_list); 734 conn->param_list = NULL; 735 736 spin_lock_bh(&sess->conn_lock); 737 atomic_set(&sess->session_continuation, 0); 738 if (sess->session_state == TARG_SESS_STATE_FAILED) { 739 pr_debug("Moving to" 740 " TARG_SESS_STATE_LOGGED_IN.\n"); 741 sess->session_state = TARG_SESS_STATE_LOGGED_IN; 742 stop_timer = 1; 743 } 744 745 pr_debug("iSCSI Login successful on CID: %hu from %s to" 746 " %s:%hu,%hu\n", conn->cid, conn->login_ip, 747 conn->local_ip, conn->local_port, tpg->tpgt); 748 749 list_add_tail(&conn->conn_list, &sess->sess_conn_list); 750 atomic_inc(&sess->nconn); 751 pr_debug("Incremented iSCSI Connection count to %hu" 752 " from node: %s\n", atomic_read(&sess->nconn), 753 sess->sess_ops->InitiatorName); 754 spin_unlock_bh(&sess->conn_lock); 755 756 iscsi_post_login_start_timers(conn); 757 758 iscsi_activate_thread_set(conn, ts); 759 /* 760 * Determine CPU mask to ensure connection's RX and TX kthreads 761 * are scheduled on the same CPU. 762 */ 763 iscsit_thread_get_cpumask(conn); 764 conn->conn_rx_reset_cpumask = 1; 765 conn->conn_tx_reset_cpumask = 1; 766 767 iscsit_dec_conn_usage_count(conn); 768 if (stop_timer) { 769 spin_lock_bh(&se_tpg->session_lock); 770 iscsit_stop_time2retain_timer(sess); 771 spin_unlock_bh(&se_tpg->session_lock); 772 } 773 iscsit_dec_session_usage_count(sess); 774 return 0; 775 } 776 777 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1); 778 iscsi_release_param_list(conn->param_list); 779 conn->param_list = NULL; 780 781 iscsit_determine_maxcmdsn(sess); 782 783 spin_lock_bh(&se_tpg->session_lock); 784 __transport_register_session(&sess->tpg->tpg_se_tpg, 785 se_sess->se_node_acl, se_sess, sess); 786 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n"); 787 sess->session_state = TARG_SESS_STATE_LOGGED_IN; 788 789 pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n", 790 conn->cid, conn->login_ip, conn->local_ip, conn->local_port, 791 tpg->tpgt); 792 793 spin_lock_bh(&sess->conn_lock); 794 list_add_tail(&conn->conn_list, &sess->sess_conn_list); 795 atomic_inc(&sess->nconn); 796 pr_debug("Incremented iSCSI Connection count to %hu from node:" 797 " %s\n", atomic_read(&sess->nconn), 798 sess->sess_ops->InitiatorName); 799 spin_unlock_bh(&sess->conn_lock); 800 801 sess->sid = tpg->sid++; 802 if (!sess->sid) 803 sess->sid = tpg->sid++; 804 pr_debug("Established iSCSI session from node: %s\n", 805 sess->sess_ops->InitiatorName); 806 807 tpg->nsessions++; 808 if (tpg->tpg_tiqn) 809 tpg->tpg_tiqn->tiqn_nsessions++; 810 811 pr_debug("Incremented number of active iSCSI sessions to %u on" 812 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt); 813 spin_unlock_bh(&se_tpg->session_lock); 814 815 iscsi_post_login_start_timers(conn); 816 iscsi_activate_thread_set(conn, ts); 817 /* 818 * Determine CPU mask to ensure connection's RX and TX kthreads 819 * are scheduled on the same CPU. 820 */ 821 iscsit_thread_get_cpumask(conn); 822 conn->conn_rx_reset_cpumask = 1; 823 conn->conn_tx_reset_cpumask = 1; 824 825 iscsit_dec_conn_usage_count(conn); 826 827 return 0; 828} 829 830static void iscsi_handle_login_thread_timeout(unsigned long data) 831{ 832 struct iscsi_np *np = (struct iscsi_np *) data; 833 834 spin_lock_bh(&np->np_thread_lock); 835 pr_err("iSCSI Login timeout on Network Portal %s:%hu\n", 836 np->np_ip, np->np_port); 837 838 if (np->np_login_timer_flags & ISCSI_TF_STOP) { 839 spin_unlock_bh(&np->np_thread_lock); 840 return; 841 } 842 843 if (np->np_thread) 844 send_sig(SIGINT, np->np_thread, 1); 845 846 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING; 847 spin_unlock_bh(&np->np_thread_lock); 848} 849 850static void iscsi_start_login_thread_timer(struct iscsi_np *np) 851{ 852 /* 853 * This used the TA_LOGIN_TIMEOUT constant because at this 854 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout 855 */ 856 spin_lock_bh(&np->np_thread_lock); 857 init_timer(&np->np_login_timer); 858 np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ); 859 np->np_login_timer.data = (unsigned long)np; 860 np->np_login_timer.function = iscsi_handle_login_thread_timeout; 861 np->np_login_timer_flags &= ~ISCSI_TF_STOP; 862 np->np_login_timer_flags |= ISCSI_TF_RUNNING; 863 add_timer(&np->np_login_timer); 864 865 pr_debug("Added timeout timer to iSCSI login request for" 866 " %u seconds.\n", TA_LOGIN_TIMEOUT); 867 spin_unlock_bh(&np->np_thread_lock); 868} 869 870static void iscsi_stop_login_thread_timer(struct iscsi_np *np) 871{ 872 spin_lock_bh(&np->np_thread_lock); 873 if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) { 874 spin_unlock_bh(&np->np_thread_lock); 875 return; 876 } 877 np->np_login_timer_flags |= ISCSI_TF_STOP; 878 spin_unlock_bh(&np->np_thread_lock); 879 880 del_timer_sync(&np->np_login_timer); 881 882 spin_lock_bh(&np->np_thread_lock); 883 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING; 884 spin_unlock_bh(&np->np_thread_lock); 885} 886 887int iscsit_setup_np( 888 struct iscsi_np *np, 889 struct __kernel_sockaddr_storage *sockaddr) 890{ 891 struct socket *sock = NULL; 892 int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len; 893 894 switch (np->np_network_transport) { 895 case ISCSI_TCP: 896 np->np_ip_proto = IPPROTO_TCP; 897 np->np_sock_type = SOCK_STREAM; 898 break; 899 case ISCSI_SCTP_TCP: 900 np->np_ip_proto = IPPROTO_SCTP; 901 np->np_sock_type = SOCK_STREAM; 902 break; 903 case ISCSI_SCTP_UDP: 904 np->np_ip_proto = IPPROTO_SCTP; 905 np->np_sock_type = SOCK_SEQPACKET; 906 break; 907 default: 908 pr_err("Unsupported network_transport: %d\n", 909 np->np_network_transport); 910 return -EINVAL; 911 } 912 913 np->np_ip_proto = IPPROTO_TCP; 914 np->np_sock_type = SOCK_STREAM; 915 916 ret = sock_create(sockaddr->ss_family, np->np_sock_type, 917 np->np_ip_proto, &sock); 918 if (ret < 0) { 919 pr_err("sock_create() failed.\n"); 920 return ret; 921 } 922 np->np_socket = sock; 923 /* 924 * Setup the np->np_sockaddr from the passed sockaddr setup 925 * in iscsi_target_configfs.c code.. 926 */ 927 memcpy(&np->np_sockaddr, sockaddr, 928 sizeof(struct __kernel_sockaddr_storage)); 929 930 if (sockaddr->ss_family == AF_INET6) 931 len = sizeof(struct sockaddr_in6); 932 else 933 len = sizeof(struct sockaddr_in); 934 /* 935 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY. 936 */ 937 /* FIXME: Someone please explain why this is endian-safe */ 938 opt = 1; 939 if (np->np_network_transport == ISCSI_TCP) { 940 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, 941 (char *)&opt, sizeof(opt)); 942 if (ret < 0) { 943 pr_err("kernel_setsockopt() for TCP_NODELAY" 944 " failed: %d\n", ret); 945 goto fail; 946 } 947 } 948 949 /* FIXME: Someone please explain why this is endian-safe */ 950 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, 951 (char *)&opt, sizeof(opt)); 952 if (ret < 0) { 953 pr_err("kernel_setsockopt() for SO_REUSEADDR" 954 " failed\n"); 955 goto fail; 956 } 957 958 ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND, 959 (char *)&opt, sizeof(opt)); 960 if (ret < 0) { 961 pr_err("kernel_setsockopt() for IP_FREEBIND" 962 " failed\n"); 963 goto fail; 964 } 965 966 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len); 967 if (ret < 0) { 968 pr_err("kernel_bind() failed: %d\n", ret); 969 goto fail; 970 } 971 972 ret = kernel_listen(sock, backlog); 973 if (ret != 0) { 974 pr_err("kernel_listen() failed: %d\n", ret); 975 goto fail; 976 } 977 978 return 0; 979fail: 980 np->np_socket = NULL; 981 if (sock) 982 sock_release(sock); 983 return ret; 984} 985 986int iscsi_target_setup_login_socket( 987 struct iscsi_np *np, 988 struct __kernel_sockaddr_storage *sockaddr) 989{ 990 struct iscsit_transport *t; 991 int rc; 992 993 t = iscsit_get_transport(np->np_network_transport); 994 if (!t) 995 return -EINVAL; 996 997 rc = t->iscsit_setup_np(np, sockaddr); 998 if (rc < 0) { 999 iscsit_put_transport(t); 1000 return rc; 1001 } 1002 1003 np->np_transport = t; 1004 np->enabled = true; 1005 return 0; 1006} 1007 1008int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn) 1009{ 1010 struct socket *new_sock, *sock = np->np_socket; 1011 struct sockaddr_in sock_in; 1012 struct sockaddr_in6 sock_in6; 1013 int rc, err; 1014 1015 rc = kernel_accept(sock, &new_sock, 0); 1016 if (rc < 0) 1017 return rc; 1018 1019 conn->sock = new_sock; 1020 conn->login_family = np->np_sockaddr.ss_family; 1021 1022 if (np->np_sockaddr.ss_family == AF_INET6) { 1023 memset(&sock_in6, 0, sizeof(struct sockaddr_in6)); 1024 1025 rc = conn->sock->ops->getname(conn->sock, 1026 (struct sockaddr *)&sock_in6, &err, 1); 1027 if (!rc) { 1028 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) 1029 snprintf(conn->login_ip, sizeof(conn->login_ip), "[%pI6c]", 1030 &sock_in6.sin6_addr.in6_u); 1031 else 1032 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI4", 1033 &sock_in6.sin6_addr.s6_addr32[3]); 1034 conn->login_port = ntohs(sock_in6.sin6_port); 1035 } 1036 1037 rc = conn->sock->ops->getname(conn->sock, 1038 (struct sockaddr *)&sock_in6, &err, 0); 1039 if (!rc) { 1040 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) 1041 snprintf(conn->local_ip, sizeof(conn->local_ip), "[%pI6c]", 1042 &sock_in6.sin6_addr.in6_u); 1043 else 1044 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI4", 1045 &sock_in6.sin6_addr.s6_addr32[3]); 1046 conn->local_port = ntohs(sock_in6.sin6_port); 1047 } 1048 } else { 1049 memset(&sock_in, 0, sizeof(struct sockaddr_in)); 1050 1051 rc = conn->sock->ops->getname(conn->sock, 1052 (struct sockaddr *)&sock_in, &err, 1); 1053 if (!rc) { 1054 sprintf(conn->login_ip, "%pI4", 1055 &sock_in.sin_addr.s_addr); 1056 conn->login_port = ntohs(sock_in.sin_port); 1057 } 1058 1059 rc = conn->sock->ops->getname(conn->sock, 1060 (struct sockaddr *)&sock_in, &err, 0); 1061 if (!rc) { 1062 sprintf(conn->local_ip, "%pI4", 1063 &sock_in.sin_addr.s_addr); 1064 conn->local_port = ntohs(sock_in.sin_port); 1065 } 1066 } 1067 1068 return 0; 1069} 1070 1071int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login) 1072{ 1073 struct iscsi_login_req *login_req; 1074 u32 padding = 0, payload_length; 1075 1076 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0) 1077 return -1; 1078 1079 login_req = (struct iscsi_login_req *)login->req; 1080 payload_length = ntoh24(login_req->dlength); 1081 padding = ((-payload_length) & 3); 1082 1083 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x," 1084 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n", 1085 login_req->flags, login_req->itt, login_req->cmdsn, 1086 login_req->exp_statsn, login_req->cid, payload_length); 1087 /* 1088 * Setup the initial iscsi_login values from the leading 1089 * login request PDU. 1090 */ 1091 if (login->first_request) { 1092 login_req = (struct iscsi_login_req *)login->req; 1093 login->leading_connection = (!login_req->tsih) ? 1 : 0; 1094 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags); 1095 login->version_min = login_req->min_version; 1096 login->version_max = login_req->max_version; 1097 memcpy(login->isid, login_req->isid, 6); 1098 login->cmd_sn = be32_to_cpu(login_req->cmdsn); 1099 login->init_task_tag = login_req->itt; 1100 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn); 1101 login->cid = be16_to_cpu(login_req->cid); 1102 login->tsih = be16_to_cpu(login_req->tsih); 1103 } 1104 1105 if (iscsi_target_check_login_request(conn, login) < 0) 1106 return -1; 1107 1108 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS); 1109 if (iscsi_login_rx_data(conn, login->req_buf, 1110 payload_length + padding) < 0) 1111 return -1; 1112 1113 return 0; 1114} 1115 1116int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login, 1117 u32 length) 1118{ 1119 if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0) 1120 return -1; 1121 1122 return 0; 1123} 1124 1125static int 1126iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t) 1127{ 1128 int rc; 1129 1130 if (!t->owner) { 1131 conn->conn_transport = t; 1132 return 0; 1133 } 1134 1135 rc = try_module_get(t->owner); 1136 if (!rc) { 1137 pr_err("try_module_get() failed for %s\n", t->name); 1138 return -EINVAL; 1139 } 1140 1141 conn->conn_transport = t; 1142 return 0; 1143} 1144 1145void iscsi_target_login_sess_out(struct iscsi_conn *conn, 1146 struct iscsi_np *np, bool zero_tsih, bool new_sess) 1147{ 1148 if (new_sess == false) 1149 goto old_sess_out; 1150 1151 pr_err("iSCSI Login negotiation failed.\n"); 1152 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR, 1153 ISCSI_LOGIN_STATUS_INIT_ERR); 1154 if (!zero_tsih || !conn->sess) 1155 goto old_sess_out; 1156 if (conn->sess->se_sess) 1157 transport_free_session(conn->sess->se_sess); 1158 if (conn->sess->session_index != 0) { 1159 spin_lock_bh(&sess_idr_lock); 1160 idr_remove(&sess_idr, conn->sess->session_index); 1161 spin_unlock_bh(&sess_idr_lock); 1162 } 1163 kfree(conn->sess->sess_ops); 1164 kfree(conn->sess); 1165 1166old_sess_out: 1167 iscsi_stop_login_thread_timer(np); 1168 /* 1169 * If login negotiation fails check if the Time2Retain timer 1170 * needs to be restarted. 1171 */ 1172 if (!zero_tsih && conn->sess) { 1173 spin_lock_bh(&conn->sess->conn_lock); 1174 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) { 1175 struct se_portal_group *se_tpg = 1176 &conn->tpg->tpg_se_tpg; 1177 1178 atomic_set(&conn->sess->session_continuation, 0); 1179 spin_unlock_bh(&conn->sess->conn_lock); 1180 spin_lock_bh(&se_tpg->session_lock); 1181 iscsit_start_time2retain_handler(conn->sess); 1182 spin_unlock_bh(&se_tpg->session_lock); 1183 } else 1184 spin_unlock_bh(&conn->sess->conn_lock); 1185 iscsit_dec_session_usage_count(conn->sess); 1186 } 1187 1188 if (!IS_ERR(conn->conn_rx_hash.tfm)) 1189 crypto_free_hash(conn->conn_rx_hash.tfm); 1190 if (!IS_ERR(conn->conn_tx_hash.tfm)) 1191 crypto_free_hash(conn->conn_tx_hash.tfm); 1192 1193 if (conn->conn_cpumask) 1194 free_cpumask_var(conn->conn_cpumask); 1195 1196 kfree(conn->conn_ops); 1197 1198 if (conn->param_list) { 1199 iscsi_release_param_list(conn->param_list); 1200 conn->param_list = NULL; 1201 } 1202 iscsi_target_nego_release(conn); 1203 1204 if (conn->sock) { 1205 sock_release(conn->sock); 1206 conn->sock = NULL; 1207 } 1208 1209 if (conn->conn_transport->iscsit_free_conn) 1210 conn->conn_transport->iscsit_free_conn(conn); 1211 1212 iscsit_put_transport(conn->conn_transport); 1213 kfree(conn); 1214} 1215 1216static int __iscsi_target_login_thread(struct iscsi_np *np) 1217{ 1218 u8 *buffer, zero_tsih = 0; 1219 int ret = 0, rc, stop; 1220 struct iscsi_conn *conn = NULL; 1221 struct iscsi_login *login; 1222 struct iscsi_portal_group *tpg = NULL; 1223 struct iscsi_login_req *pdu; 1224 struct iscsi_tpg_np *tpg_np; 1225 bool new_sess = false; 1226 1227 flush_signals(current); 1228 1229 spin_lock_bh(&np->np_thread_lock); 1230 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) { 1231 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; 1232 complete(&np->np_restart_comp); 1233 } else { 1234 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE; 1235 } 1236 spin_unlock_bh(&np->np_thread_lock); 1237 1238 conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL); 1239 if (!conn) { 1240 pr_err("Could not allocate memory for" 1241 " new connection\n"); 1242 /* Get another socket */ 1243 return 1; 1244 } 1245 pr_debug("Moving to TARG_CONN_STATE_FREE.\n"); 1246 conn->conn_state = TARG_CONN_STATE_FREE; 1247 1248 if (iscsit_conn_set_transport(conn, np->np_transport) < 0) { 1249 kfree(conn); 1250 return 1; 1251 } 1252 1253 rc = np->np_transport->iscsit_accept_np(np, conn); 1254 if (rc == -ENOSYS) { 1255 complete(&np->np_restart_comp); 1256 iscsit_put_transport(conn->conn_transport); 1257 kfree(conn); 1258 conn = NULL; 1259 goto exit; 1260 } else if (rc < 0) { 1261 spin_lock_bh(&np->np_thread_lock); 1262 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) { 1263 spin_unlock_bh(&np->np_thread_lock); 1264 complete(&np->np_restart_comp); 1265 iscsit_put_transport(conn->conn_transport); 1266 kfree(conn); 1267 conn = NULL; 1268 if (ret == -ENODEV) 1269 goto out; 1270 /* Get another socket */ 1271 return 1; 1272 } 1273 spin_unlock_bh(&np->np_thread_lock); 1274 iscsit_put_transport(conn->conn_transport); 1275 kfree(conn); 1276 conn = NULL; 1277 goto out; 1278 } 1279 /* 1280 * Perform the remaining iSCSI connection initialization items.. 1281 */ 1282 login = iscsi_login_init_conn(conn); 1283 if (!login) { 1284 goto new_sess_out; 1285 } 1286 1287 iscsi_start_login_thread_timer(np); 1288 1289 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n"); 1290 conn->conn_state = TARG_CONN_STATE_XPT_UP; 1291 /* 1292 * This will process the first login request + payload.. 1293 */ 1294 rc = np->np_transport->iscsit_get_login_rx(conn, login); 1295 if (rc == 1) 1296 return 1; 1297 else if (rc < 0) 1298 goto new_sess_out; 1299 1300 buffer = &login->req[0]; 1301 pdu = (struct iscsi_login_req *)buffer; 1302 /* 1303 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs 1304 * when Status-Class != 0. 1305 */ 1306 conn->login_itt = pdu->itt; 1307 1308 spin_lock_bh(&np->np_thread_lock); 1309 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) { 1310 spin_unlock_bh(&np->np_thread_lock); 1311 pr_err("iSCSI Network Portal on %s:%hu currently not" 1312 " active.\n", np->np_ip, np->np_port); 1313 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR, 1314 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE); 1315 goto new_sess_out; 1316 } 1317 spin_unlock_bh(&np->np_thread_lock); 1318 1319 conn->network_transport = np->np_network_transport; 1320 1321 pr_debug("Received iSCSI login request from %s on %s Network" 1322 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name, 1323 conn->local_ip, conn->local_port); 1324 1325 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n"); 1326 conn->conn_state = TARG_CONN_STATE_IN_LOGIN; 1327 1328 if (iscsi_login_check_initiator_version(conn, pdu->max_version, 1329 pdu->min_version) < 0) 1330 goto new_sess_out; 1331 1332 zero_tsih = (pdu->tsih == 0x0000); 1333 if (zero_tsih) { 1334 /* 1335 * This is the leading connection of a new session. 1336 * We wait until after authentication to check for 1337 * session reinstatement. 1338 */ 1339 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0) 1340 goto new_sess_out; 1341 } else { 1342 /* 1343 * Add a new connection to an existing session. 1344 * We check for a non-existant session in 1345 * iscsi_login_non_zero_tsih_s2() below based 1346 * on ISID/TSIH, but wait until after authentication 1347 * to check for connection reinstatement, etc. 1348 */ 1349 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0) 1350 goto new_sess_out; 1351 } 1352 /* 1353 * SessionType: Discovery 1354 * 1355 * Locates Default Portal 1356 * 1357 * SessionType: Normal 1358 * 1359 * Locates Target Portal from NP -> Target IQN 1360 */ 1361 rc = iscsi_target_locate_portal(np, conn, login); 1362 if (rc < 0) { 1363 tpg = conn->tpg; 1364 goto new_sess_out; 1365 } 1366 login->zero_tsih = zero_tsih; 1367 1368 tpg = conn->tpg; 1369 if (!tpg) { 1370 pr_err("Unable to locate struct iscsi_conn->tpg\n"); 1371 goto new_sess_out; 1372 } 1373 1374 if (zero_tsih) { 1375 if (iscsi_login_zero_tsih_s2(conn) < 0) 1376 goto new_sess_out; 1377 } else { 1378 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0) 1379 goto old_sess_out; 1380 } 1381 1382 ret = iscsi_target_start_negotiation(login, conn); 1383 if (ret < 0) 1384 goto new_sess_out; 1385 1386 if (!conn->sess) { 1387 pr_err("struct iscsi_conn session pointer is NULL!\n"); 1388 goto new_sess_out; 1389 } 1390 1391 iscsi_stop_login_thread_timer(np); 1392 1393 if (signal_pending(current)) 1394 goto new_sess_out; 1395 1396 if (ret == 1) { 1397 tpg_np = conn->tpg_np; 1398 1399 ret = iscsi_post_login_handler(np, conn, zero_tsih); 1400 if (ret < 0) 1401 goto new_sess_out; 1402 1403 iscsit_deaccess_np(np, tpg, tpg_np); 1404 } 1405 1406 tpg = NULL; 1407 tpg_np = NULL; 1408 /* Get another socket */ 1409 return 1; 1410 1411new_sess_out: 1412 new_sess = true; 1413old_sess_out: 1414 tpg_np = conn->tpg_np; 1415 iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess); 1416 new_sess = false; 1417 1418 if (tpg) { 1419 iscsit_deaccess_np(np, tpg, tpg_np); 1420 tpg = NULL; 1421 tpg_np = NULL; 1422 } 1423 1424out: 1425 stop = kthread_should_stop(); 1426 /* Wait for another socket.. */ 1427 if (!stop) 1428 return 1; 1429exit: 1430 iscsi_stop_login_thread_timer(np); 1431 spin_lock_bh(&np->np_thread_lock); 1432 np->np_thread_state = ISCSI_NP_THREAD_EXIT; 1433 spin_unlock_bh(&np->np_thread_lock); 1434 1435 return 0; 1436} 1437 1438int iscsi_target_login_thread(void *arg) 1439{ 1440 struct iscsi_np *np = arg; 1441 int ret; 1442 1443 allow_signal(SIGINT); 1444 1445 while (!kthread_should_stop()) { 1446 ret = __iscsi_target_login_thread(np); 1447 /* 1448 * We break and exit here unless another sock_accept() call 1449 * is expected. 1450 */ 1451 if (ret != 1) 1452 break; 1453 } 1454 1455 return 0; 1456} 1457