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1// SPDX-License-Identifier: GPL-2.0-or-later2/*******************************************************************************3 * This file contains the login functions used by the iSCSI Target driver.4 *5 * (c) Copyright 2007-2013 Datera, Inc.6 *7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>8 *9 ******************************************************************************/10 11#include <crypto/hash.h>12#include <linux/module.h>13#include <linux/string.h>14#include <linux/kthread.h>15#include <linux/sched/signal.h>16#include <linux/idr.h>17#include <linux/tcp.h> /* TCP_NODELAY */18#include <net/ip.h>19#include <net/ipv6.h> /* ipv6_addr_v4mapped() */20#include <scsi/iscsi_proto.h>21#include <target/target_core_base.h>22#include <target/target_core_fabric.h>23 24#include <target/iscsi/iscsi_target_core.h>25#include <target/iscsi/iscsi_target_stat.h>26#include "iscsi_target_device.h"27#include "iscsi_target_nego.h"28#include "iscsi_target_erl0.h"29#include "iscsi_target_erl2.h"30#include "iscsi_target_login.h"31#include "iscsi_target_tpg.h"32#include "iscsi_target_util.h"33#include "iscsi_target.h"34#include "iscsi_target_parameters.h"35 36#include <target/iscsi/iscsi_transport.h>37 38static struct iscsi_login *iscsi_login_init_conn(struct iscsit_conn *conn)39{40 struct iscsi_login *login;41 42 login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);43 if (!login) {44 pr_err("Unable to allocate memory for struct iscsi_login.\n");45 return NULL;46 }47 conn->login = login;48 login->conn = conn;49 login->first_request = 1;50 51 login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);52 if (!login->req_buf) {53 pr_err("Unable to allocate memory for response buffer.\n");54 goto out_login;55 }56 57 login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);58 if (!login->rsp_buf) {59 pr_err("Unable to allocate memory for request buffer.\n");60 goto out_req_buf;61 }62 63 conn->conn_login = login;64 65 return login;66 67out_req_buf:68 kfree(login->req_buf);69out_login:70 kfree(login);71 return NULL;72}73 74/*75 * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup76 * per struct iscsit_conn libcrypto contexts for crc32c and crc32-intel77 */78int iscsi_login_setup_crypto(struct iscsit_conn *conn)79{80 struct crypto_ahash *tfm;81 82 /*83 * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts84 * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback85 * to software 1x8 byte slicing from crc32c.ko86 */87 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);88 if (IS_ERR(tfm)) {89 pr_err("crypto_alloc_ahash() failed\n");90 return -ENOMEM;91 }92 93 conn->conn_rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);94 if (!conn->conn_rx_hash) {95 pr_err("ahash_request_alloc() failed for conn_rx_hash\n");96 crypto_free_ahash(tfm);97 return -ENOMEM;98 }99 ahash_request_set_callback(conn->conn_rx_hash, 0, NULL, NULL);100 101 conn->conn_tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);102 if (!conn->conn_tx_hash) {103 pr_err("ahash_request_alloc() failed for conn_tx_hash\n");104 ahash_request_free(conn->conn_rx_hash);105 conn->conn_rx_hash = NULL;106 crypto_free_ahash(tfm);107 return -ENOMEM;108 }109 ahash_request_set_callback(conn->conn_tx_hash, 0, NULL, NULL);110 111 return 0;112}113 114static int iscsi_login_check_initiator_version(115 struct iscsit_conn *conn,116 u8 version_max,117 u8 version_min)118{119 if ((version_max != 0x00) || (version_min != 0x00)) {120 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"121 " version Min/Max 0x%02x/0x%02x, rejecting login.\n",122 version_min, version_max);123 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,124 ISCSI_LOGIN_STATUS_NO_VERSION);125 return -1;126 }127 128 return 0;129}130 131int iscsi_check_for_session_reinstatement(struct iscsit_conn *conn)132{133 int sessiontype;134 struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;135 struct iscsi_portal_group *tpg = conn->tpg;136 struct iscsit_session *sess = NULL, *sess_p = NULL;137 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;138 struct se_session *se_sess, *se_sess_tmp;139 140 initiatorname_param = iscsi_find_param_from_key(141 INITIATORNAME, conn->param_list);142 sessiontype_param = iscsi_find_param_from_key(143 SESSIONTYPE, conn->param_list);144 if (!initiatorname_param || !sessiontype_param) {145 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,146 ISCSI_LOGIN_STATUS_MISSING_FIELDS);147 return -1;148 }149 150 sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;151 152 spin_lock_bh(&se_tpg->session_lock);153 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,154 sess_list) {155 156 sess_p = se_sess->fabric_sess_ptr;157 spin_lock(&sess_p->conn_lock);158 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||159 atomic_read(&sess_p->session_logout) ||160 atomic_read(&sess_p->session_close) ||161 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {162 spin_unlock(&sess_p->conn_lock);163 continue;164 }165 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&166 (!strcmp(sess_p->sess_ops->InitiatorName,167 initiatorname_param->value) &&168 (sess_p->sess_ops->SessionType == sessiontype))) {169 atomic_set(&sess_p->session_reinstatement, 1);170 atomic_set(&sess_p->session_fall_back_to_erl0, 1);171 atomic_set(&sess_p->session_close, 1);172 spin_unlock(&sess_p->conn_lock);173 iscsit_inc_session_usage_count(sess_p);174 iscsit_stop_time2retain_timer(sess_p);175 sess = sess_p;176 break;177 }178 spin_unlock(&sess_p->conn_lock);179 }180 spin_unlock_bh(&se_tpg->session_lock);181 /*182 * If the Time2Retain handler has expired, the session is already gone.183 */184 if (!sess)185 return 0;186 187 pr_debug("%s iSCSI Session SID %u is still active for %s,"188 " performing session reinstatement.\n", (sessiontype) ?189 "Discovery" : "Normal", sess->sid,190 sess->sess_ops->InitiatorName);191 192 spin_lock_bh(&sess->conn_lock);193 if (sess->session_state == TARG_SESS_STATE_FAILED) {194 spin_unlock_bh(&sess->conn_lock);195 iscsit_dec_session_usage_count(sess);196 return 0;197 }198 spin_unlock_bh(&sess->conn_lock);199 200 iscsit_stop_session(sess, 1, 1);201 iscsit_dec_session_usage_count(sess);202 203 return 0;204}205 206static int iscsi_login_set_conn_values(207 struct iscsit_session *sess,208 struct iscsit_conn *conn,209 __be16 cid)210{211 int ret;212 conn->sess = sess;213 conn->cid = be16_to_cpu(cid);214 /*215 * Generate a random Status sequence number (statsn) for the new216 * iSCSI connection.217 */218 ret = get_random_bytes_wait(&conn->stat_sn, sizeof(u32));219 if (unlikely(ret))220 return ret;221 222 mutex_lock(&auth_id_lock);223 conn->auth_id = iscsit_global->auth_id++;224 mutex_unlock(&auth_id_lock);225 return 0;226}227 228__printf(2, 3) int iscsi_change_param_sprintf(229 struct iscsit_conn *conn,230 const char *fmt, ...)231{232 va_list args;233 unsigned char buf[64];234 235 memset(buf, 0, sizeof buf);236 237 va_start(args, fmt);238 vsnprintf(buf, sizeof buf, fmt, args);239 va_end(args);240 241 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {242 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,243 ISCSI_LOGIN_STATUS_NO_RESOURCES);244 return -1;245 }246 247 return 0;248}249EXPORT_SYMBOL(iscsi_change_param_sprintf);250 251/*252 * This is the leading connection of a new session,253 * or session reinstatement.254 */255static int iscsi_login_zero_tsih_s1(256 struct iscsit_conn *conn,257 unsigned char *buf)258{259 struct iscsit_session *sess = NULL;260 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;261 int ret;262 263 sess = kzalloc(sizeof(struct iscsit_session), GFP_KERNEL);264 if (!sess) {265 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,266 ISCSI_LOGIN_STATUS_NO_RESOURCES);267 pr_err("Could not allocate memory for session\n");268 return -ENOMEM;269 }270 271 if (iscsi_login_set_conn_values(sess, conn, pdu->cid))272 goto free_sess;273 274 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 timer_setup(&sess->time2retain_timer,293 iscsit_handle_time2retain_timeout, 0);294 295 ret = ida_alloc(&sess_ida, GFP_KERNEL);296 if (ret < 0) {297 pr_err("Session ID allocation failed %d\n", ret);298 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,299 ISCSI_LOGIN_STATUS_NO_RESOURCES);300 goto free_sess;301 }302 303 sess->session_index = ret;304 sess->creation_time = get_jiffies_64();305 /*306 * The FFP CmdSN window values will be allocated from the TPG's307 * Initiator Node's ACL once the login has been successfully completed.308 */309 atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));310 311 sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);312 if (!sess->sess_ops) {313 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,314 ISCSI_LOGIN_STATUS_NO_RESOURCES);315 pr_err("Unable to allocate memory for"316 " struct iscsi_sess_ops.\n");317 goto free_id;318 }319 320 sess->se_sess = transport_alloc_session(TARGET_PROT_NORMAL);321 if (IS_ERR(sess->se_sess)) {322 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,323 ISCSI_LOGIN_STATUS_NO_RESOURCES);324 goto free_ops;325 }326 327 return 0;328 329free_ops:330 kfree(sess->sess_ops);331free_id:332 ida_free(&sess_ida, sess->session_index);333free_sess:334 kfree(sess);335 conn->sess = NULL;336 return -ENOMEM;337}338 339static int iscsi_login_zero_tsih_s2(340 struct iscsit_conn *conn)341{342 struct iscsi_node_attrib *na;343 struct iscsit_session *sess = conn->sess;344 struct iscsi_param *param;345 bool iser = false;346 347 sess->tpg = conn->tpg;348 349 /*350 * Assign a new TPG Session Handle. Note this is protected with351 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().352 */353 sess->tsih = ++sess->tpg->ntsih;354 if (!sess->tsih)355 sess->tsih = ++sess->tpg->ntsih;356 357 /*358 * Create the default params from user defined values..359 */360 if (iscsi_copy_param_list(&conn->param_list,361 conn->tpg->param_list, 1) < 0) {362 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,363 ISCSI_LOGIN_STATUS_NO_RESOURCES);364 return -1;365 }366 367 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)368 iser = true;369 370 iscsi_set_keys_to_negotiate(conn->param_list, iser);371 372 if (sess->sess_ops->SessionType)373 return iscsi_set_keys_irrelevant_for_discovery(374 conn->param_list);375 376 na = iscsit_tpg_get_node_attrib(sess);377 378 /*379 * If ACL allows non-authorized access in TPG with CHAP,380 * then set None to AuthMethod.381 */382 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);383 if (param && !strstr(param->value, NONE)) {384 if (!iscsi_conn_auth_required(conn))385 if (iscsi_change_param_sprintf(conn, "AuthMethod=%s",386 NONE))387 return -1;388 }389 390 /*391 * Need to send TargetPortalGroupTag back in first login response392 * on any iSCSI connection where the Initiator provides TargetName.393 * See 5.3.1. Login Phase Start394 *395 * In our case, we have already located the struct iscsi_tiqn at this point.396 */397 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))398 return -1;399 400 /*401 * Workaround for Initiators that have broken connection recovery logic.402 *403 * "We would really like to get rid of this." Linux-iSCSI.org team404 */405 if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))406 return -1;407 408 /*409 * Set RDMAExtensions=Yes by default for iSER enabled network portals410 */411 if (iser) {412 struct iscsi_param *param;413 unsigned long mrdsl, off;414 int rc;415 416 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))417 return -1;418 419 /*420 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for421 * Immediate Data + Unsolicited Data-OUT if necessary..422 */423 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",424 conn->param_list);425 if (!param) {426 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,427 ISCSI_LOGIN_STATUS_NO_RESOURCES);428 return -1;429 }430 rc = kstrtoul(param->value, 0, &mrdsl);431 if (rc < 0) {432 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,433 ISCSI_LOGIN_STATUS_NO_RESOURCES);434 return -1;435 }436 off = mrdsl % PAGE_SIZE;437 if (!off)438 goto check_prot;439 440 if (mrdsl < PAGE_SIZE)441 mrdsl = PAGE_SIZE;442 else443 mrdsl -= off;444 445 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"446 " to PAGE_SIZE\n", mrdsl);447 448 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))449 return -1;450 /*451 * ISER currently requires that ImmediateData + Unsolicited452 * Data be disabled when protection / signature MRs are enabled.453 */454check_prot:455 if (sess->se_sess->sup_prot_ops &456 (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |457 TARGET_PROT_DOUT_INSERT)) {458 459 if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))460 return -1;461 462 if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))463 return -1;464 465 pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"466 " T10-PI enabled ISER session\n");467 }468 }469 470 return 0;471}472 473static int iscsi_login_non_zero_tsih_s1(474 struct iscsit_conn *conn,475 unsigned char *buf)476{477 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;478 479 return iscsi_login_set_conn_values(NULL, conn, pdu->cid);480}481 482/*483 * Add a new connection to an existing session.484 */485static int iscsi_login_non_zero_tsih_s2(486 struct iscsit_conn *conn,487 unsigned char *buf)488{489 struct iscsi_portal_group *tpg = conn->tpg;490 struct iscsit_session *sess = NULL, *sess_p = NULL;491 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;492 struct se_session *se_sess, *se_sess_tmp;493 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;494 bool iser = false;495 496 spin_lock_bh(&se_tpg->session_lock);497 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,498 sess_list) {499 500 sess_p = (struct iscsit_session *)se_sess->fabric_sess_ptr;501 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||502 atomic_read(&sess_p->session_logout) ||503 atomic_read(&sess_p->session_close) ||504 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))505 continue;506 if (!memcmp(sess_p->isid, pdu->isid, 6) &&507 (sess_p->tsih == be16_to_cpu(pdu->tsih))) {508 iscsit_inc_session_usage_count(sess_p);509 iscsit_stop_time2retain_timer(sess_p);510 sess = sess_p;511 break;512 }513 }514 spin_unlock_bh(&se_tpg->session_lock);515 516 /*517 * If the Time2Retain handler has expired, the session is already gone.518 */519 if (!sess) {520 pr_err("Initiator attempting to add a connection to"521 " a non-existent session, rejecting iSCSI Login.\n");522 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,523 ISCSI_LOGIN_STATUS_NO_SESSION);524 return -1;525 }526 527 /*528 * Stop the Time2Retain timer if this is a failed session, we restart529 * the timer if the login is not successful.530 */531 spin_lock_bh(&sess->conn_lock);532 if (sess->session_state == TARG_SESS_STATE_FAILED)533 atomic_set(&sess->session_continuation, 1);534 spin_unlock_bh(&sess->conn_lock);535 536 if (iscsi_login_set_conn_values(sess, conn, pdu->cid) < 0 ||537 iscsi_copy_param_list(&conn->param_list,538 conn->tpg->param_list, 0) < 0) {539 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,540 ISCSI_LOGIN_STATUS_NO_RESOURCES);541 return -1;542 }543 544 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)545 iser = true;546 547 iscsi_set_keys_to_negotiate(conn->param_list, iser);548 /*549 * Need to send TargetPortalGroupTag back in first login response550 * on any iSCSI connection where the Initiator provides TargetName.551 * See 5.3.1. Login Phase Start552 *553 * In our case, we have already located the struct iscsi_tiqn at this point.554 */555 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))556 return -1;557 558 return 0;559}560 561int iscsi_login_post_auth_non_zero_tsih(562 struct iscsit_conn *conn,563 u16 cid,564 u32 exp_statsn)565{566 struct iscsit_conn *conn_ptr = NULL;567 struct iscsi_conn_recovery *cr = NULL;568 struct iscsit_session *sess = conn->sess;569 570 /*571 * By following item 5 in the login table, if we have found572 * an existing ISID and a valid/existing TSIH and an existing573 * CID we do connection reinstatement. Currently we dont not574 * support it so we send back an non-zero status class to the575 * initiator and release the new connection.576 */577 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);578 if (conn_ptr) {579 pr_err("Connection exists with CID %hu for %s,"580 " performing connection reinstatement.\n",581 conn_ptr->cid, sess->sess_ops->InitiatorName);582 583 iscsit_connection_reinstatement_rcfr(conn_ptr);584 iscsit_dec_conn_usage_count(conn_ptr);585 }586 587 /*588 * Check for any connection recovery entries containing CID.589 * We use the original ExpStatSN sent in the first login request590 * to acknowledge commands for the failed connection.591 *592 * Also note that an explict logout may have already been sent,593 * but the response may not be sent due to additional connection594 * loss.595 */596 if (sess->sess_ops->ErrorRecoveryLevel == 2) {597 cr = iscsit_get_inactive_connection_recovery_entry(598 sess, cid);599 if (cr) {600 pr_debug("Performing implicit logout"601 " for connection recovery on CID: %hu\n",602 conn->cid);603 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);604 }605 }606 607 /*608 * Else we follow item 4 from the login table in that we have609 * found an existing ISID and a valid/existing TSIH and a new610 * CID we go ahead and continue to add a new connection to the611 * session.612 */613 pr_debug("Adding CID %hu to existing session for %s.\n",614 cid, sess->sess_ops->InitiatorName);615 616 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {617 pr_err("Adding additional connection to this session"618 " would exceed MaxConnections %d, login failed.\n",619 sess->sess_ops->MaxConnections);620 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,621 ISCSI_LOGIN_STATUS_ISID_ERROR);622 return -1;623 }624 625 return 0;626}627 628static void iscsi_post_login_start_timers(struct iscsit_conn *conn)629{630 struct iscsit_session *sess = conn->sess;631 /*632 * FIXME: Unsolicited NopIN support for ISER633 */634 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)635 return;636 637 if (!sess->sess_ops->SessionType)638 iscsit_start_nopin_timer(conn);639}640 641int iscsit_start_kthreads(struct iscsit_conn *conn)642{643 int ret = 0;644 645 spin_lock(&iscsit_global->ts_bitmap_lock);646 conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,647 ISCSIT_BITMAP_BITS, get_order(1));648 spin_unlock(&iscsit_global->ts_bitmap_lock);649 650 if (conn->bitmap_id < 0) {651 pr_err("bitmap_find_free_region() failed for"652 " iscsit_start_kthreads()\n");653 return -ENOMEM;654 }655 656 conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,657 "%s", ISCSI_TX_THREAD_NAME);658 if (IS_ERR(conn->tx_thread)) {659 pr_err("Unable to start iscsi_target_tx_thread\n");660 ret = PTR_ERR(conn->tx_thread);661 goto out_bitmap;662 }663 conn->tx_thread_active = true;664 665 conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,666 "%s", ISCSI_RX_THREAD_NAME);667 if (IS_ERR(conn->rx_thread)) {668 pr_err("Unable to start iscsi_target_rx_thread\n");669 ret = PTR_ERR(conn->rx_thread);670 goto out_tx;671 }672 conn->rx_thread_active = true;673 674 return 0;675out_tx:676 send_sig(SIGINT, conn->tx_thread, 1);677 kthread_stop(conn->tx_thread);678 conn->tx_thread_active = false;679out_bitmap:680 spin_lock(&iscsit_global->ts_bitmap_lock);681 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,682 get_order(1));683 spin_unlock(&iscsit_global->ts_bitmap_lock);684 return ret;685}686 687void iscsi_post_login_handler(688 struct iscsi_np *np,689 struct iscsit_conn *conn,690 u8 zero_tsih)691{692 int stop_timer = 0;693 struct iscsit_session *sess = conn->sess;694 struct se_session *se_sess = sess->se_sess;695 struct iscsi_portal_group *tpg = sess->tpg;696 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;697 698 iscsit_inc_conn_usage_count(conn);699 700 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,701 ISCSI_LOGIN_STATUS_ACCEPT);702 703 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");704 conn->conn_state = TARG_CONN_STATE_LOGGED_IN;705 706 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);707 /*708 * SCSI Initiator -> SCSI Target Port Mapping709 */710 if (!zero_tsih) {711 iscsi_set_session_parameters(sess->sess_ops,712 conn->param_list, 0);713 iscsi_release_param_list(conn->param_list);714 conn->param_list = NULL;715 716 spin_lock_bh(&sess->conn_lock);717 atomic_set(&sess->session_continuation, 0);718 if (sess->session_state == TARG_SESS_STATE_FAILED) {719 pr_debug("Moving to"720 " TARG_SESS_STATE_LOGGED_IN.\n");721 sess->session_state = TARG_SESS_STATE_LOGGED_IN;722 stop_timer = 1;723 }724 725 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"726 " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,727 &conn->local_sockaddr, tpg->tpgt);728 729 list_add_tail(&conn->conn_list, &sess->sess_conn_list);730 atomic_inc(&sess->nconn);731 pr_debug("Incremented iSCSI Connection count to %d"732 " from node: %s\n", atomic_read(&sess->nconn),733 sess->sess_ops->InitiatorName);734 spin_unlock_bh(&sess->conn_lock);735 736 iscsi_post_login_start_timers(conn);737 /*738 * Determine CPU mask to ensure connection's RX and TX kthreads739 * are scheduled on the same CPU.740 */741 iscsit_thread_get_cpumask(conn);742 conn->conn_rx_reset_cpumask = 1;743 conn->conn_tx_reset_cpumask = 1;744 /*745 * Wakeup the sleeping iscsi_target_rx_thread() now that746 * iscsit_conn is in TARG_CONN_STATE_LOGGED_IN state.747 */748 complete(&conn->rx_login_comp);749 iscsit_dec_conn_usage_count(conn);750 751 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;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 %pISpc to %pISpc,%hu\n",773 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,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 %d 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 /*800 * Determine CPU mask to ensure connection's RX and TX kthreads801 * are scheduled on the same CPU.802 */803 iscsit_thread_get_cpumask(conn);804 conn->conn_rx_reset_cpumask = 1;805 conn->conn_tx_reset_cpumask = 1;806 /*807 * Wakeup the sleeping iscsi_target_rx_thread() now that808 * iscsit_conn is in TARG_CONN_STATE_LOGGED_IN state.809 */810 complete(&conn->rx_login_comp);811 iscsit_dec_conn_usage_count(conn);812}813 814int iscsit_setup_np(815 struct iscsi_np *np,816 struct sockaddr_storage *sockaddr)817{818 struct socket *sock = NULL;819 int backlog = ISCSIT_TCP_BACKLOG, ret, len;820 821 switch (np->np_network_transport) {822 case ISCSI_TCP:823 np->np_ip_proto = IPPROTO_TCP;824 np->np_sock_type = SOCK_STREAM;825 break;826 case ISCSI_SCTP_TCP:827 np->np_ip_proto = IPPROTO_SCTP;828 np->np_sock_type = SOCK_STREAM;829 break;830 case ISCSI_SCTP_UDP:831 np->np_ip_proto = IPPROTO_SCTP;832 np->np_sock_type = SOCK_SEQPACKET;833 break;834 default:835 pr_err("Unsupported network_transport: %d\n",836 np->np_network_transport);837 return -EINVAL;838 }839 840 ret = sock_create(sockaddr->ss_family, np->np_sock_type,841 np->np_ip_proto, &sock);842 if (ret < 0) {843 pr_err("sock_create() failed.\n");844 return ret;845 }846 np->np_socket = sock;847 /*848 * Setup the np->np_sockaddr from the passed sockaddr setup849 * in iscsi_target_configfs.c code..850 */851 memcpy(&np->np_sockaddr, sockaddr,852 sizeof(struct sockaddr_storage));853 854 if (sockaddr->ss_family == AF_INET6)855 len = sizeof(struct sockaddr_in6);856 else857 len = sizeof(struct sockaddr_in);858 /*859 * Set SO_REUSEADDR, and disable Nagle Algorithm with TCP_NODELAY.860 */861 if (np->np_network_transport == ISCSI_TCP)862 tcp_sock_set_nodelay(sock->sk);863 sock_set_reuseaddr(sock->sk);864 ip_sock_set_freebind(sock->sk);865 866 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);867 if (ret < 0) {868 pr_err("kernel_bind() failed: %d\n", ret);869 goto fail;870 }871 872 ret = kernel_listen(sock, backlog);873 if (ret != 0) {874 pr_err("kernel_listen() failed: %d\n", ret);875 goto fail;876 }877 878 return 0;879fail:880 np->np_socket = NULL;881 sock_release(sock);882 return ret;883}884 885int iscsi_target_setup_login_socket(886 struct iscsi_np *np,887 struct sockaddr_storage *sockaddr)888{889 struct iscsit_transport *t;890 int rc;891 892 t = iscsit_get_transport(np->np_network_transport);893 if (!t)894 return -EINVAL;895 896 rc = t->iscsit_setup_np(np, sockaddr);897 if (rc < 0) {898 iscsit_put_transport(t);899 return rc;900 }901 902 np->np_transport = t;903 np->enabled = true;904 return 0;905}906 907int iscsit_accept_np(struct iscsi_np *np, struct iscsit_conn *conn)908{909 struct socket *new_sock, *sock = np->np_socket;910 struct sockaddr_in sock_in;911 struct sockaddr_in6 sock_in6;912 int rc;913 914 rc = kernel_accept(sock, &new_sock, 0);915 if (rc < 0)916 return rc;917 918 conn->sock = new_sock;919 conn->login_family = np->np_sockaddr.ss_family;920 921 if (np->np_sockaddr.ss_family == AF_INET6) {922 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));923 924 rc = conn->sock->ops->getname(conn->sock,925 (struct sockaddr *)&sock_in6, 1);926 if (rc >= 0) {927 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {928 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));929 } else {930 /* Pretend to be an ipv4 socket */931 sock_in.sin_family = AF_INET;932 sock_in.sin_port = sock_in6.sin6_port;933 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);934 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));935 }936 }937 938 rc = conn->sock->ops->getname(conn->sock,939 (struct sockaddr *)&sock_in6, 0);940 if (rc >= 0) {941 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {942 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));943 } else {944 /* Pretend to be an ipv4 socket */945 sock_in.sin_family = AF_INET;946 sock_in.sin_port = sock_in6.sin6_port;947 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);948 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));949 }950 }951 } else {952 memset(&sock_in, 0, sizeof(struct sockaddr_in));953 954 rc = conn->sock->ops->getname(conn->sock,955 (struct sockaddr *)&sock_in, 1);956 if (rc >= 0)957 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));958 959 rc = conn->sock->ops->getname(conn->sock,960 (struct sockaddr *)&sock_in, 0);961 if (rc >= 0)962 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));963 }964 965 return 0;966}967 968int iscsit_get_login_rx(struct iscsit_conn *conn, struct iscsi_login *login)969{970 struct iscsi_login_req *login_req;971 u32 padding = 0, payload_length;972 973 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)974 return -1;975 976 login_req = (struct iscsi_login_req *)login->req;977 payload_length = ntoh24(login_req->dlength);978 padding = ((-payload_length) & 3);979 980 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"981 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",982 login_req->flags, login_req->itt, login_req->cmdsn,983 login_req->exp_statsn, login_req->cid, payload_length);984 /*985 * Setup the initial iscsi_login values from the leading986 * login request PDU.987 */988 if (login->first_request) {989 login_req = (struct iscsi_login_req *)login->req;990 login->leading_connection = (!login_req->tsih) ? 1 : 0;991 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);992 login->version_min = login_req->min_version;993 login->version_max = login_req->max_version;994 memcpy(login->isid, login_req->isid, 6);995 login->cmd_sn = be32_to_cpu(login_req->cmdsn);996 login->init_task_tag = login_req->itt;997 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);998 login->cid = be16_to_cpu(login_req->cid);999 login->tsih = be16_to_cpu(login_req->tsih);1000 }1001 1002 if (iscsi_target_check_login_request(conn, login) < 0)1003 return -1;1004 1005 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);1006 if (iscsi_login_rx_data(conn, login->req_buf,1007 payload_length + padding) < 0)1008 return -1;1009 1010 return 0;1011}1012 1013int iscsit_put_login_tx(struct iscsit_conn *conn, struct iscsi_login *login,1014 u32 length)1015{1016 if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)1017 return -1;1018 1019 return 0;1020}1021 1022static int1023iscsit_conn_set_transport(struct iscsit_conn *conn, struct iscsit_transport *t)1024{1025 int rc;1026 1027 if (!t->owner) {1028 conn->conn_transport = t;1029 return 0;1030 }1031 1032 rc = try_module_get(t->owner);1033 if (!rc) {1034 pr_err("try_module_get() failed for %s\n", t->name);1035 return -EINVAL;1036 }1037 1038 conn->conn_transport = t;1039 return 0;1040}1041 1042static struct iscsit_conn *iscsit_alloc_conn(struct iscsi_np *np)1043{1044 struct iscsit_conn *conn;1045 1046 conn = kzalloc(sizeof(struct iscsit_conn), GFP_KERNEL);1047 if (!conn) {1048 pr_err("Could not allocate memory for new connection\n");1049 return NULL;1050 }1051 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");1052 conn->conn_state = TARG_CONN_STATE_FREE;1053 1054 init_waitqueue_head(&conn->queues_wq);1055 INIT_LIST_HEAD(&conn->conn_list);1056 INIT_LIST_HEAD(&conn->conn_cmd_list);1057 INIT_LIST_HEAD(&conn->immed_queue_list);1058 INIT_LIST_HEAD(&conn->response_queue_list);1059 init_completion(&conn->conn_post_wait_comp);1060 init_completion(&conn->conn_wait_comp);1061 init_completion(&conn->conn_wait_rcfr_comp);1062 init_completion(&conn->conn_waiting_on_uc_comp);1063 init_completion(&conn->conn_logout_comp);1064 init_completion(&conn->rx_half_close_comp);1065 init_completion(&conn->tx_half_close_comp);1066 init_completion(&conn->rx_login_comp);1067 spin_lock_init(&conn->cmd_lock);1068 spin_lock_init(&conn->conn_usage_lock);1069 spin_lock_init(&conn->immed_queue_lock);1070 spin_lock_init(&conn->nopin_timer_lock);1071 spin_lock_init(&conn->response_queue_lock);1072 spin_lock_init(&conn->state_lock);1073 spin_lock_init(&conn->login_worker_lock);1074 spin_lock_init(&conn->login_timer_lock);1075 1076 timer_setup(&conn->nopin_response_timer,1077 iscsit_handle_nopin_response_timeout, 0);1078 timer_setup(&conn->nopin_timer, iscsit_handle_nopin_timeout, 0);1079 timer_setup(&conn->login_timer, iscsit_login_timeout, 0);1080 1081 if (iscsit_conn_set_transport(conn, np->np_transport) < 0)1082 goto free_conn;1083 1084 conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);1085 if (!conn->conn_ops) {1086 pr_err("Unable to allocate memory for struct iscsi_conn_ops.\n");1087 goto put_transport;1088 }1089 1090 if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {1091 pr_err("Unable to allocate conn->conn_cpumask\n");1092 goto free_conn_ops;1093 }1094 1095 if (!zalloc_cpumask_var(&conn->allowed_cpumask, GFP_KERNEL)) {1096 pr_err("Unable to allocate conn->allowed_cpumask\n");1097 goto free_conn_cpumask;1098 }1099 1100 conn->cmd_cnt = target_alloc_cmd_counter();1101 if (!conn->cmd_cnt)1102 goto free_conn_allowed_cpumask;1103 1104 return conn;1105 1106free_conn_allowed_cpumask:1107 free_cpumask_var(conn->allowed_cpumask);1108free_conn_cpumask:1109 free_cpumask_var(conn->conn_cpumask);1110free_conn_ops:1111 kfree(conn->conn_ops);1112put_transport:1113 iscsit_put_transport(conn->conn_transport);1114free_conn:1115 kfree(conn);1116 return NULL;1117}1118 1119void iscsit_free_conn(struct iscsit_conn *conn)1120{1121 target_free_cmd_counter(conn->cmd_cnt);1122 free_cpumask_var(conn->allowed_cpumask);1123 free_cpumask_var(conn->conn_cpumask);1124 kfree(conn->conn_ops);1125 iscsit_put_transport(conn->conn_transport);1126 kfree(conn);1127}1128 1129void iscsi_target_login_sess_out(struct iscsit_conn *conn,1130 bool zero_tsih, bool new_sess)1131{1132 if (!new_sess)1133 goto old_sess_out;1134 1135 pr_err("iSCSI Login negotiation failed.\n");1136 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,1137 ISCSI_LOGIN_STATUS_INIT_ERR);1138 if (!zero_tsih || !conn->sess)1139 goto old_sess_out;1140 1141 transport_free_session(conn->sess->se_sess);1142 ida_free(&sess_ida, conn->sess->session_index);1143 kfree(conn->sess->sess_ops);1144 kfree(conn->sess);1145 conn->sess = NULL;1146 1147old_sess_out:1148 /*1149 * If login negotiation fails check if the Time2Retain timer1150 * needs to be restarted.1151 */1152 if (!zero_tsih && conn->sess) {1153 spin_lock_bh(&conn->sess->conn_lock);1154 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {1155 struct se_portal_group *se_tpg =1156 &conn->tpg->tpg_se_tpg;1157 1158 atomic_set(&conn->sess->session_continuation, 0);1159 spin_unlock_bh(&conn->sess->conn_lock);1160 spin_lock_bh(&se_tpg->session_lock);1161 iscsit_start_time2retain_handler(conn->sess);1162 spin_unlock_bh(&se_tpg->session_lock);1163 } else1164 spin_unlock_bh(&conn->sess->conn_lock);1165 iscsit_dec_session_usage_count(conn->sess);1166 }1167 1168 ahash_request_free(conn->conn_tx_hash);1169 if (conn->conn_rx_hash) {1170 struct crypto_ahash *tfm;1171 1172 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);1173 ahash_request_free(conn->conn_rx_hash);1174 crypto_free_ahash(tfm);1175 }1176 1177 if (conn->param_list) {1178 iscsi_release_param_list(conn->param_list);1179 conn->param_list = NULL;1180 }1181 iscsi_target_nego_release(conn);1182 1183 if (conn->sock) {1184 sock_release(conn->sock);1185 conn->sock = NULL;1186 }1187 1188 if (conn->conn_transport->iscsit_wait_conn)1189 conn->conn_transport->iscsit_wait_conn(conn);1190 1191 if (conn->conn_transport->iscsit_free_conn)1192 conn->conn_transport->iscsit_free_conn(conn);1193 1194 iscsit_free_conn(conn);1195}1196 1197static int __iscsi_target_login_thread(struct iscsi_np *np)1198{1199 u8 *buffer, zero_tsih = 0;1200 int ret = 0, rc;1201 struct iscsit_conn *conn = NULL;1202 struct iscsi_login *login;1203 struct iscsi_portal_group *tpg = NULL;1204 struct iscsi_login_req *pdu;1205 struct iscsi_tpg_np *tpg_np;1206 bool new_sess = false;1207 1208 flush_signals(current);1209 1210 spin_lock_bh(&np->np_thread_lock);1211 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {1212 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;1213 spin_unlock_bh(&np->np_thread_lock);1214 complete(&np->np_restart_comp);1215 return 1;1216 } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {1217 spin_unlock_bh(&np->np_thread_lock);1218 goto exit;1219 } else {1220 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;1221 }1222 spin_unlock_bh(&np->np_thread_lock);1223 1224 conn = iscsit_alloc_conn(np);1225 if (!conn) {1226 /* Get another socket */1227 return 1;1228 }1229 1230 rc = np->np_transport->iscsit_accept_np(np, conn);1231 if (rc == -ENOSYS) {1232 complete(&np->np_restart_comp);1233 iscsit_free_conn(conn);1234 goto exit;1235 } else if (rc < 0) {1236 spin_lock_bh(&np->np_thread_lock);1237 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {1238 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;1239 spin_unlock_bh(&np->np_thread_lock);1240 complete(&np->np_restart_comp);1241 iscsit_free_conn(conn);1242 /* Get another socket */1243 return 1;1244 }1245 spin_unlock_bh(&np->np_thread_lock);1246 iscsit_free_conn(conn);1247 return 1;1248 }1249 /*1250 * Perform the remaining iSCSI connection initialization items..1251 */1252 login = iscsi_login_init_conn(conn);1253 if (!login) {1254 goto new_sess_out;1255 }1256 1257 iscsit_start_login_timer(conn, current);1258 1259 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");1260 conn->conn_state = TARG_CONN_STATE_XPT_UP;1261 /*1262 * This will process the first login request + payload..1263 */1264 rc = np->np_transport->iscsit_get_login_rx(conn, login);1265 if (rc == 1)1266 return 1;1267 else if (rc < 0)1268 goto new_sess_out;1269 1270 buffer = &login->req[0];1271 pdu = (struct iscsi_login_req *)buffer;1272 /*1273 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs1274 * when Status-Class != 0.1275 */1276 conn->login_itt = pdu->itt;1277 1278 spin_lock_bh(&np->np_thread_lock);1279 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {1280 spin_unlock_bh(&np->np_thread_lock);1281 pr_err("iSCSI Network Portal on %pISpc currently not"1282 " active.\n", &np->np_sockaddr);1283 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,1284 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);1285 goto new_sess_out;1286 }1287 spin_unlock_bh(&np->np_thread_lock);1288 1289 conn->network_transport = np->np_network_transport;1290 1291 pr_debug("Received iSCSI login request from %pISpc on %s Network"1292 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,1293 &conn->local_sockaddr);1294 1295 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");1296 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;1297 1298 if (iscsi_login_check_initiator_version(conn, pdu->max_version,1299 pdu->min_version) < 0)1300 goto new_sess_out;1301 1302 zero_tsih = (pdu->tsih == 0x0000);1303 if (zero_tsih) {1304 /*1305 * This is the leading connection of a new session.1306 * We wait until after authentication to check for1307 * session reinstatement.1308 */1309 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)1310 goto new_sess_out;1311 } else {1312 /*1313 * Add a new connection to an existing session.1314 * We check for a non-existant session in1315 * iscsi_login_non_zero_tsih_s2() below based1316 * on ISID/TSIH, but wait until after authentication1317 * to check for connection reinstatement, etc.1318 */1319 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)1320 goto new_sess_out;1321 }1322 /*1323 * SessionType: Discovery1324 *1325 * Locates Default Portal1326 *1327 * SessionType: Normal1328 *1329 * Locates Target Portal from NP -> Target IQN1330 */1331 rc = iscsi_target_locate_portal(np, conn, login);1332 if (rc < 0) {1333 tpg = conn->tpg;1334 goto new_sess_out;1335 }1336 login->zero_tsih = zero_tsih;1337 1338 if (conn->sess)1339 conn->sess->se_sess->sup_prot_ops =1340 conn->conn_transport->iscsit_get_sup_prot_ops(conn);1341 1342 tpg = conn->tpg;1343 if (!tpg) {1344 pr_err("Unable to locate struct iscsit_conn->tpg\n");1345 goto new_sess_out;1346 }1347 1348 if (zero_tsih) {1349 if (iscsi_login_zero_tsih_s2(conn) < 0)1350 goto new_sess_out;1351 } else {1352 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)1353 goto old_sess_out;1354 }1355 1356 if (conn->conn_transport->iscsit_validate_params) {1357 ret = conn->conn_transport->iscsit_validate_params(conn);1358 if (ret < 0) {1359 if (zero_tsih)1360 goto new_sess_out;1361 else1362 goto old_sess_out;1363 }1364 }1365 1366 ret = iscsi_target_start_negotiation(login, conn);1367 if (ret < 0)1368 goto new_sess_out;1369 1370 if (ret == 1) {1371 tpg_np = conn->tpg_np;1372 1373 iscsi_post_login_handler(np, conn, zero_tsih);1374 iscsit_deaccess_np(np, tpg, tpg_np);1375 }1376 1377 tpg = NULL;1378 tpg_np = NULL;1379 /* Get another socket */1380 return 1;1381 1382new_sess_out:1383 new_sess = true;1384old_sess_out:1385 iscsit_stop_login_timer(conn);1386 tpg_np = conn->tpg_np;1387 iscsi_target_login_sess_out(conn, zero_tsih, new_sess);1388 new_sess = false;1389 1390 if (tpg) {1391 iscsit_deaccess_np(np, tpg, tpg_np);1392 tpg = NULL;1393 tpg_np = NULL;1394 }1395 1396 return 1;1397 1398exit:1399 spin_lock_bh(&np->np_thread_lock);1400 np->np_thread_state = ISCSI_NP_THREAD_EXIT;1401 spin_unlock_bh(&np->np_thread_lock);1402 1403 return 0;1404}1405 1406int iscsi_target_login_thread(void *arg)1407{1408 struct iscsi_np *np = arg;1409 int ret;1410 1411 allow_signal(SIGINT);1412 1413 while (1) {1414 ret = __iscsi_target_login_thread(np);1415 /*1416 * We break and exit here unless another sock_accept() call1417 * is expected.1418 */1419 if (ret != 1)1420 break;1421 }1422 1423 while (!kthread_should_stop()) {1424 msleep(100);1425 }1426 1427 return 0;1428}1429