1 /*******************************************************************************
2 * This file contains the login functions used by the iSCSI Target driver.
4 * (c) Copyright 2007-2013 Datera, Inc.
6 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
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.
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 ******************************************************************************/
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>
27 #include <target/iscsi/iscsi_target_core.h>
28 #include <target/iscsi/iscsi_target_stat.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_tpg.h"
35 #include "iscsi_target_util.h"
36 #include "iscsi_target.h"
37 #include "iscsi_target_parameters.h"
39 #include <target/iscsi/iscsi_transport.h>
41 static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
43 struct iscsi_login *login;
45 login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
47 pr_err("Unable to allocate memory for struct iscsi_login.\n");
52 login->first_request = 1;
54 login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
55 if (!login->req_buf) {
56 pr_err("Unable to allocate memory for response buffer.\n");
60 login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
61 if (!login->rsp_buf) {
62 pr_err("Unable to allocate memory for request buffer.\n");
66 conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
67 if (!conn->conn_ops) {
68 pr_err("Unable to allocate memory for"
69 " struct iscsi_conn_ops.\n");
73 init_waitqueue_head(&conn->queues_wq);
74 INIT_LIST_HEAD(&conn->conn_list);
75 INIT_LIST_HEAD(&conn->conn_cmd_list);
76 INIT_LIST_HEAD(&conn->immed_queue_list);
77 INIT_LIST_HEAD(&conn->response_queue_list);
78 init_completion(&conn->conn_post_wait_comp);
79 init_completion(&conn->conn_wait_comp);
80 init_completion(&conn->conn_wait_rcfr_comp);
81 init_completion(&conn->conn_waiting_on_uc_comp);
82 init_completion(&conn->conn_logout_comp);
83 init_completion(&conn->rx_half_close_comp);
84 init_completion(&conn->tx_half_close_comp);
85 spin_lock_init(&conn->cmd_lock);
86 spin_lock_init(&conn->conn_usage_lock);
87 spin_lock_init(&conn->immed_queue_lock);
88 spin_lock_init(&conn->nopin_timer_lock);
89 spin_lock_init(&conn->response_queue_lock);
90 spin_lock_init(&conn->state_lock);
92 if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
93 pr_err("Unable to allocate conn->conn_cpumask\n");
96 conn->conn_login = login;
101 kfree(conn->conn_ops);
103 kfree(login->rsp_buf);
105 kfree(login->req_buf);
112 * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
113 * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
115 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
118 * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
119 * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
120 * to software 1x8 byte slicing from crc32c.ko
122 conn->conn_rx_hash.flags = 0;
123 conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
125 if (IS_ERR(conn->conn_rx_hash.tfm)) {
126 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
130 conn->conn_tx_hash.flags = 0;
131 conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
133 if (IS_ERR(conn->conn_tx_hash.tfm)) {
134 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
135 crypto_free_hash(conn->conn_rx_hash.tfm);
142 static int iscsi_login_check_initiator_version(
143 struct iscsi_conn *conn,
147 if ((version_max != 0x00) || (version_min != 0x00)) {
148 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
149 " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
150 version_min, version_max);
151 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
152 ISCSI_LOGIN_STATUS_NO_VERSION);
159 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
162 struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
163 struct iscsi_portal_group *tpg = conn->tpg;
164 struct iscsi_session *sess = NULL, *sess_p = NULL;
165 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
166 struct se_session *se_sess, *se_sess_tmp;
168 initiatorname_param = iscsi_find_param_from_key(
169 INITIATORNAME, conn->param_list);
170 sessiontype_param = iscsi_find_param_from_key(
171 SESSIONTYPE, conn->param_list);
172 if (!initiatorname_param || !sessiontype_param) {
173 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
174 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
178 sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
180 spin_lock_bh(&se_tpg->session_lock);
181 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
184 sess_p = se_sess->fabric_sess_ptr;
185 spin_lock(&sess_p->conn_lock);
186 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
187 atomic_read(&sess_p->session_logout) ||
188 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
189 spin_unlock(&sess_p->conn_lock);
192 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
193 (!strcmp(sess_p->sess_ops->InitiatorName,
194 initiatorname_param->value) &&
195 (sess_p->sess_ops->SessionType == sessiontype))) {
196 atomic_set(&sess_p->session_reinstatement, 1);
197 spin_unlock(&sess_p->conn_lock);
198 iscsit_inc_session_usage_count(sess_p);
199 iscsit_stop_time2retain_timer(sess_p);
203 spin_unlock(&sess_p->conn_lock);
205 spin_unlock_bh(&se_tpg->session_lock);
207 * If the Time2Retain handler has expired, the session is already gone.
212 pr_debug("%s iSCSI Session SID %u is still active for %s,"
213 " preforming session reinstatement.\n", (sessiontype) ?
214 "Discovery" : "Normal", sess->sid,
215 sess->sess_ops->InitiatorName);
217 spin_lock_bh(&sess->conn_lock);
218 if (sess->session_state == TARG_SESS_STATE_FAILED) {
219 spin_unlock_bh(&sess->conn_lock);
220 iscsit_dec_session_usage_count(sess);
221 target_put_session(sess->se_sess);
224 spin_unlock_bh(&sess->conn_lock);
226 iscsit_stop_session(sess, 1, 1);
227 iscsit_dec_session_usage_count(sess);
229 target_put_session(sess->se_sess);
233 static void iscsi_login_set_conn_values(
234 struct iscsi_session *sess,
235 struct iscsi_conn *conn,
239 conn->cid = be16_to_cpu(cid);
241 * Generate a random Status sequence number (statsn) for the new
244 get_random_bytes(&conn->stat_sn, sizeof(u32));
246 mutex_lock(&auth_id_lock);
247 conn->auth_id = iscsit_global->auth_id++;
248 mutex_unlock(&auth_id_lock);
251 static __printf(2, 3) int iscsi_change_param_sprintf(
252 struct iscsi_conn *conn,
253 const char *fmt, ...)
256 unsigned char buf[64];
258 memset(buf, 0, sizeof buf);
261 vsnprintf(buf, sizeof buf, fmt, args);
264 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
265 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
266 ISCSI_LOGIN_STATUS_NO_RESOURCES);
274 * This is the leading connection of a new session,
275 * or session reinstatement.
277 static int iscsi_login_zero_tsih_s1(
278 struct iscsi_conn *conn,
281 struct iscsi_session *sess = NULL;
282 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
285 sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
287 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
288 ISCSI_LOGIN_STATUS_NO_RESOURCES);
289 pr_err("Could not allocate memory for session\n");
293 iscsi_login_set_conn_values(sess, conn, pdu->cid);
294 sess->init_task_tag = pdu->itt;
295 memcpy(&sess->isid, pdu->isid, 6);
296 sess->exp_cmd_sn = be32_to_cpu(pdu->cmdsn);
297 INIT_LIST_HEAD(&sess->sess_conn_list);
298 INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
299 INIT_LIST_HEAD(&sess->cr_active_list);
300 INIT_LIST_HEAD(&sess->cr_inactive_list);
301 init_completion(&sess->async_msg_comp);
302 init_completion(&sess->reinstatement_comp);
303 init_completion(&sess->session_wait_comp);
304 init_completion(&sess->session_waiting_on_uc_comp);
305 mutex_init(&sess->cmdsn_mutex);
306 spin_lock_init(&sess->conn_lock);
307 spin_lock_init(&sess->cr_a_lock);
308 spin_lock_init(&sess->cr_i_lock);
309 spin_lock_init(&sess->session_usage_lock);
310 spin_lock_init(&sess->ttt_lock);
312 idr_preload(GFP_KERNEL);
313 spin_lock_bh(&sess_idr_lock);
314 ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
316 sess->session_index = ret;
317 spin_unlock_bh(&sess_idr_lock);
321 pr_err("idr_alloc() for sess_idr failed\n");
322 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
323 ISCSI_LOGIN_STATUS_NO_RESOURCES);
328 sess->creation_time = get_jiffies_64();
330 * The FFP CmdSN window values will be allocated from the TPG's
331 * Initiator Node's ACL once the login has been successfully completed.
333 sess->max_cmd_sn = be32_to_cpu(pdu->cmdsn);
335 sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
336 if (!sess->sess_ops) {
337 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
338 ISCSI_LOGIN_STATUS_NO_RESOURCES);
339 pr_err("Unable to allocate memory for"
340 " struct iscsi_sess_ops.\n");
345 sess->se_sess = transport_init_session(TARGET_PROT_NORMAL);
346 if (IS_ERR(sess->se_sess)) {
347 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
348 ISCSI_LOGIN_STATUS_NO_RESOURCES);
349 kfree(sess->sess_ops);
357 static int iscsi_login_zero_tsih_s2(
358 struct iscsi_conn *conn)
360 struct iscsi_node_attrib *na;
361 struct iscsi_session *sess = conn->sess;
364 sess->tpg = conn->tpg;
367 * Assign a new TPG Session Handle. Note this is protected with
368 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
370 sess->tsih = ++sess->tpg->ntsih;
372 sess->tsih = ++sess->tpg->ntsih;
375 * Create the default params from user defined values..
377 if (iscsi_copy_param_list(&conn->param_list,
378 conn->tpg->param_list, 1) < 0) {
379 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
380 ISCSI_LOGIN_STATUS_NO_RESOURCES);
384 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
387 iscsi_set_keys_to_negotiate(conn->param_list, iser);
389 if (sess->sess_ops->SessionType)
390 return iscsi_set_keys_irrelevant_for_discovery(
393 na = iscsit_tpg_get_node_attrib(sess);
396 * Need to send TargetPortalGroupTag back in first login response
397 * on any iSCSI connection where the Initiator provides TargetName.
398 * See 5.3.1. Login Phase Start
400 * In our case, we have already located the struct iscsi_tiqn at this point.
402 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
406 * Workaround for Initiators that have broken connection recovery logic.
408 * "We would really like to get rid of this." Linux-iSCSI.org team
410 if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
413 if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
416 * Set RDMAExtensions=Yes by default for iSER enabled network portals
419 struct iscsi_param *param;
420 unsigned long mrdsl, off;
423 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
427 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
428 * Immediate Data + Unsolicitied Data-OUT if necessary..
430 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
433 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
434 ISCSI_LOGIN_STATUS_NO_RESOURCES);
437 rc = kstrtoul(param->value, 0, &mrdsl);
439 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
440 ISCSI_LOGIN_STATUS_NO_RESOURCES);
443 off = mrdsl % PAGE_SIZE;
447 if (mrdsl < PAGE_SIZE)
452 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
453 " to PAGE_SIZE\n", mrdsl);
455 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
458 * ISER currently requires that ImmediateData + Unsolicited
459 * Data be disabled when protection / signature MRs are enabled.
462 if (sess->se_sess->sup_prot_ops &
463 (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
464 TARGET_PROT_DOUT_INSERT)) {
466 if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
469 if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
472 pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
473 " T10-PI enabled ISER session\n");
481 * Remove PSTATE_NEGOTIATE for the four FIM related keys.
482 * The Initiator node will be able to enable FIM by proposing them itself.
484 int iscsi_login_disable_FIM_keys(
485 struct iscsi_param_list *param_list,
486 struct iscsi_conn *conn)
488 struct iscsi_param *param;
490 param = iscsi_find_param_from_key("OFMarker", param_list);
492 pr_err("iscsi_find_param_from_key() for"
493 " OFMarker failed\n");
494 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
495 ISCSI_LOGIN_STATUS_NO_RESOURCES);
498 param->state &= ~PSTATE_NEGOTIATE;
500 param = iscsi_find_param_from_key("OFMarkInt", param_list);
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);
508 param->state &= ~PSTATE_NEGOTIATE;
510 param = iscsi_find_param_from_key("IFMarker", param_list);
512 pr_err("iscsi_find_param_from_key() for"
513 " IFMarker failed\n");
514 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
515 ISCSI_LOGIN_STATUS_NO_RESOURCES);
518 param->state &= ~PSTATE_NEGOTIATE;
520 param = iscsi_find_param_from_key("IFMarkInt", param_list);
522 pr_err("iscsi_find_param_from_key() for"
523 " IFMarker failed\n");
524 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
525 ISCSI_LOGIN_STATUS_NO_RESOURCES);
528 param->state &= ~PSTATE_NEGOTIATE;
533 static int iscsi_login_non_zero_tsih_s1(
534 struct iscsi_conn *conn,
537 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
539 iscsi_login_set_conn_values(NULL, conn, pdu->cid);
544 * Add a new connection to an existing session.
546 static int iscsi_login_non_zero_tsih_s2(
547 struct iscsi_conn *conn,
550 struct iscsi_portal_group *tpg = conn->tpg;
551 struct iscsi_session *sess = NULL, *sess_p = NULL;
552 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
553 struct se_session *se_sess, *se_sess_tmp;
554 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
557 spin_lock_bh(&se_tpg->session_lock);
558 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
561 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
562 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
563 atomic_read(&sess_p->session_logout) ||
564 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
566 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
567 (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
568 iscsit_inc_session_usage_count(sess_p);
569 iscsit_stop_time2retain_timer(sess_p);
574 spin_unlock_bh(&se_tpg->session_lock);
577 * If the Time2Retain handler has expired, the session is already gone.
580 pr_err("Initiator attempting to add a connection to"
581 " a non-existent session, rejecting iSCSI Login.\n");
582 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
583 ISCSI_LOGIN_STATUS_NO_SESSION);
588 * Stop the Time2Retain timer if this is a failed session, we restart
589 * the timer if the login is not successful.
591 spin_lock_bh(&sess->conn_lock);
592 if (sess->session_state == TARG_SESS_STATE_FAILED)
593 atomic_set(&sess->session_continuation, 1);
594 spin_unlock_bh(&sess->conn_lock);
596 iscsi_login_set_conn_values(sess, conn, pdu->cid);
598 if (iscsi_copy_param_list(&conn->param_list,
599 conn->tpg->param_list, 0) < 0) {
600 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
601 ISCSI_LOGIN_STATUS_NO_RESOURCES);
605 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
608 iscsi_set_keys_to_negotiate(conn->param_list, iser);
610 * Need to send TargetPortalGroupTag back in first login response
611 * on any iSCSI connection where the Initiator provides TargetName.
612 * See 5.3.1. Login Phase Start
614 * In our case, we have already located the struct iscsi_tiqn at this point.
616 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
619 return iscsi_login_disable_FIM_keys(conn->param_list, conn);
622 int iscsi_login_post_auth_non_zero_tsih(
623 struct iscsi_conn *conn,
627 struct iscsi_conn *conn_ptr = NULL;
628 struct iscsi_conn_recovery *cr = NULL;
629 struct iscsi_session *sess = conn->sess;
632 * By following item 5 in the login table, if we have found
633 * an existing ISID and a valid/existing TSIH and an existing
634 * CID we do connection reinstatement. Currently we dont not
635 * support it so we send back an non-zero status class to the
636 * initiator and release the new connection.
638 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
640 pr_err("Connection exists with CID %hu for %s,"
641 " performing connection reinstatement.\n",
642 conn_ptr->cid, sess->sess_ops->InitiatorName);
644 iscsit_connection_reinstatement_rcfr(conn_ptr);
645 iscsit_dec_conn_usage_count(conn_ptr);
649 * Check for any connection recovery entires containing CID.
650 * We use the original ExpStatSN sent in the first login request
651 * to acknowledge commands for the failed connection.
653 * Also note that an explict logout may have already been sent,
654 * but the response may not be sent due to additional connection
657 if (sess->sess_ops->ErrorRecoveryLevel == 2) {
658 cr = iscsit_get_inactive_connection_recovery_entry(
661 pr_debug("Performing implicit logout"
662 " for connection recovery on CID: %hu\n",
664 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
669 * Else we follow item 4 from the login table in that we have
670 * found an existing ISID and a valid/existing TSIH and a new
671 * CID we go ahead and continue to add a new connection to the
674 pr_debug("Adding CID %hu to existing session for %s.\n",
675 cid, sess->sess_ops->InitiatorName);
677 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
678 pr_err("Adding additional connection to this session"
679 " would exceed MaxConnections %d, login failed.\n",
680 sess->sess_ops->MaxConnections);
681 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
682 ISCSI_LOGIN_STATUS_ISID_ERROR);
689 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
691 struct iscsi_session *sess = conn->sess;
693 * FIXME: Unsolicitied NopIN support for ISER
695 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
698 if (!sess->sess_ops->SessionType)
699 iscsit_start_nopin_timer(conn);
702 static int iscsit_start_kthreads(struct iscsi_conn *conn)
706 spin_lock(&iscsit_global->ts_bitmap_lock);
707 conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
708 ISCSIT_BITMAP_BITS, get_order(1));
709 spin_unlock(&iscsit_global->ts_bitmap_lock);
711 if (conn->bitmap_id < 0) {
712 pr_err("bitmap_find_free_region() failed for"
713 " iscsit_start_kthreads()\n");
717 conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
718 "%s", ISCSI_TX_THREAD_NAME);
719 if (IS_ERR(conn->tx_thread)) {
720 pr_err("Unable to start iscsi_target_tx_thread\n");
721 ret = PTR_ERR(conn->tx_thread);
724 conn->tx_thread_active = true;
726 conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
727 "%s", ISCSI_RX_THREAD_NAME);
728 if (IS_ERR(conn->rx_thread)) {
729 pr_err("Unable to start iscsi_target_rx_thread\n");
730 ret = PTR_ERR(conn->rx_thread);
733 conn->rx_thread_active = true;
737 kthread_stop(conn->tx_thread);
738 conn->tx_thread_active = false;
740 spin_lock(&iscsit_global->ts_bitmap_lock);
741 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
743 spin_unlock(&iscsit_global->ts_bitmap_lock);
747 int iscsi_post_login_handler(
749 struct iscsi_conn *conn,
753 struct iscsi_session *sess = conn->sess;
754 struct se_session *se_sess = sess->se_sess;
755 struct iscsi_portal_group *tpg = sess->tpg;
756 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
759 iscsit_inc_conn_usage_count(conn);
761 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
762 ISCSI_LOGIN_STATUS_ACCEPT);
764 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
765 conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
767 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
768 iscsit_set_sync_and_steering_values(conn);
770 * SCSI Initiator -> SCSI Target Port Mapping
773 iscsi_set_session_parameters(sess->sess_ops,
774 conn->param_list, 0);
775 iscsi_release_param_list(conn->param_list);
776 conn->param_list = NULL;
778 spin_lock_bh(&sess->conn_lock);
779 atomic_set(&sess->session_continuation, 0);
780 if (sess->session_state == TARG_SESS_STATE_FAILED) {
782 " TARG_SESS_STATE_LOGGED_IN.\n");
783 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
787 pr_debug("iSCSI Login successful on CID: %hu from %s to"
788 " %s:%hu,%hu\n", conn->cid, conn->login_ip,
789 conn->local_ip, conn->local_port, tpg->tpgt);
791 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
792 atomic_inc(&sess->nconn);
793 pr_debug("Incremented iSCSI Connection count to %hu"
794 " from node: %s\n", atomic_read(&sess->nconn),
795 sess->sess_ops->InitiatorName);
796 spin_unlock_bh(&sess->conn_lock);
798 rc = iscsit_start_kthreads(conn);
802 iscsi_post_login_start_timers(conn);
804 * Determine CPU mask to ensure connection's RX and TX kthreads
805 * are scheduled on the same CPU.
807 iscsit_thread_get_cpumask(conn);
808 conn->conn_rx_reset_cpumask = 1;
809 conn->conn_tx_reset_cpumask = 1;
811 iscsit_dec_conn_usage_count(conn);
813 spin_lock_bh(&se_tpg->session_lock);
814 iscsit_stop_time2retain_timer(sess);
815 spin_unlock_bh(&se_tpg->session_lock);
817 iscsit_dec_session_usage_count(sess);
821 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
822 iscsi_release_param_list(conn->param_list);
823 conn->param_list = NULL;
825 iscsit_determine_maxcmdsn(sess);
827 spin_lock_bh(&se_tpg->session_lock);
828 __transport_register_session(&sess->tpg->tpg_se_tpg,
829 se_sess->se_node_acl, se_sess, sess);
830 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
831 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
833 pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
834 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
837 spin_lock_bh(&sess->conn_lock);
838 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
839 atomic_inc(&sess->nconn);
840 pr_debug("Incremented iSCSI Connection count to %hu from node:"
841 " %s\n", atomic_read(&sess->nconn),
842 sess->sess_ops->InitiatorName);
843 spin_unlock_bh(&sess->conn_lock);
845 sess->sid = tpg->sid++;
847 sess->sid = tpg->sid++;
848 pr_debug("Established iSCSI session from node: %s\n",
849 sess->sess_ops->InitiatorName);
853 tpg->tpg_tiqn->tiqn_nsessions++;
855 pr_debug("Incremented number of active iSCSI sessions to %u on"
856 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
857 spin_unlock_bh(&se_tpg->session_lock);
859 rc = iscsit_start_kthreads(conn);
863 iscsi_post_login_start_timers(conn);
865 * Determine CPU mask to ensure connection's RX and TX kthreads
866 * are scheduled on the same CPU.
868 iscsit_thread_get_cpumask(conn);
869 conn->conn_rx_reset_cpumask = 1;
870 conn->conn_tx_reset_cpumask = 1;
872 iscsit_dec_conn_usage_count(conn);
877 static void iscsi_handle_login_thread_timeout(unsigned long data)
879 struct iscsi_np *np = (struct iscsi_np *) data;
881 spin_lock_bh(&np->np_thread_lock);
882 pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
883 np->np_ip, np->np_port);
885 if (np->np_login_timer_flags & ISCSI_TF_STOP) {
886 spin_unlock_bh(&np->np_thread_lock);
891 send_sig(SIGINT, np->np_thread, 1);
893 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
894 spin_unlock_bh(&np->np_thread_lock);
897 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
900 * This used the TA_LOGIN_TIMEOUT constant because at this
901 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
903 spin_lock_bh(&np->np_thread_lock);
904 init_timer(&np->np_login_timer);
905 np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
906 np->np_login_timer.data = (unsigned long)np;
907 np->np_login_timer.function = iscsi_handle_login_thread_timeout;
908 np->np_login_timer_flags &= ~ISCSI_TF_STOP;
909 np->np_login_timer_flags |= ISCSI_TF_RUNNING;
910 add_timer(&np->np_login_timer);
912 pr_debug("Added timeout timer to iSCSI login request for"
913 " %u seconds.\n", TA_LOGIN_TIMEOUT);
914 spin_unlock_bh(&np->np_thread_lock);
917 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
919 spin_lock_bh(&np->np_thread_lock);
920 if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
921 spin_unlock_bh(&np->np_thread_lock);
924 np->np_login_timer_flags |= ISCSI_TF_STOP;
925 spin_unlock_bh(&np->np_thread_lock);
927 del_timer_sync(&np->np_login_timer);
929 spin_lock_bh(&np->np_thread_lock);
930 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
931 spin_unlock_bh(&np->np_thread_lock);
936 struct __kernel_sockaddr_storage *sockaddr)
938 struct socket *sock = NULL;
939 int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
941 switch (np->np_network_transport) {
943 np->np_ip_proto = IPPROTO_TCP;
944 np->np_sock_type = SOCK_STREAM;
947 np->np_ip_proto = IPPROTO_SCTP;
948 np->np_sock_type = SOCK_STREAM;
951 np->np_ip_proto = IPPROTO_SCTP;
952 np->np_sock_type = SOCK_SEQPACKET;
955 pr_err("Unsupported network_transport: %d\n",
956 np->np_network_transport);
960 np->np_ip_proto = IPPROTO_TCP;
961 np->np_sock_type = SOCK_STREAM;
963 ret = sock_create(sockaddr->ss_family, np->np_sock_type,
964 np->np_ip_proto, &sock);
966 pr_err("sock_create() failed.\n");
969 np->np_socket = sock;
971 * Setup the np->np_sockaddr from the passed sockaddr setup
972 * in iscsi_target_configfs.c code..
974 memcpy(&np->np_sockaddr, sockaddr,
975 sizeof(struct __kernel_sockaddr_storage));
977 if (sockaddr->ss_family == AF_INET6)
978 len = sizeof(struct sockaddr_in6);
980 len = sizeof(struct sockaddr_in);
982 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
984 /* FIXME: Someone please explain why this is endian-safe */
986 if (np->np_network_transport == ISCSI_TCP) {
987 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
988 (char *)&opt, sizeof(opt));
990 pr_err("kernel_setsockopt() for TCP_NODELAY"
991 " failed: %d\n", ret);
996 /* FIXME: Someone please explain why this is endian-safe */
997 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
998 (char *)&opt, sizeof(opt));
1000 pr_err("kernel_setsockopt() for SO_REUSEADDR"
1005 ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
1006 (char *)&opt, sizeof(opt));
1008 pr_err("kernel_setsockopt() for IP_FREEBIND"
1013 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
1015 pr_err("kernel_bind() failed: %d\n", ret);
1019 ret = kernel_listen(sock, backlog);
1021 pr_err("kernel_listen() failed: %d\n", ret);
1027 np->np_socket = NULL;
1032 int iscsi_target_setup_login_socket(
1033 struct iscsi_np *np,
1034 struct __kernel_sockaddr_storage *sockaddr)
1036 struct iscsit_transport *t;
1039 t = iscsit_get_transport(np->np_network_transport);
1043 rc = t->iscsit_setup_np(np, sockaddr);
1045 iscsit_put_transport(t);
1049 np->np_transport = t;
1054 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1056 struct socket *new_sock, *sock = np->np_socket;
1057 struct sockaddr_in sock_in;
1058 struct sockaddr_in6 sock_in6;
1061 rc = kernel_accept(sock, &new_sock, 0);
1065 conn->sock = new_sock;
1066 conn->login_family = np->np_sockaddr.ss_family;
1068 if (np->np_sockaddr.ss_family == AF_INET6) {
1069 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1071 rc = conn->sock->ops->getname(conn->sock,
1072 (struct sockaddr *)&sock_in6, &err, 1);
1074 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1075 snprintf(conn->login_ip, sizeof(conn->login_ip), "[%pI6c]",
1076 &sock_in6.sin6_addr.in6_u);
1078 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI4",
1079 &sock_in6.sin6_addr.s6_addr32[3]);
1080 conn->login_port = ntohs(sock_in6.sin6_port);
1083 rc = conn->sock->ops->getname(conn->sock,
1084 (struct sockaddr *)&sock_in6, &err, 0);
1086 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1087 snprintf(conn->local_ip, sizeof(conn->local_ip), "[%pI6c]",
1088 &sock_in6.sin6_addr.in6_u);
1090 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI4",
1091 &sock_in6.sin6_addr.s6_addr32[3]);
1092 conn->local_port = ntohs(sock_in6.sin6_port);
1095 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1097 rc = conn->sock->ops->getname(conn->sock,
1098 (struct sockaddr *)&sock_in, &err, 1);
1100 sprintf(conn->login_ip, "%pI4",
1101 &sock_in.sin_addr.s_addr);
1102 conn->login_port = ntohs(sock_in.sin_port);
1105 rc = conn->sock->ops->getname(conn->sock,
1106 (struct sockaddr *)&sock_in, &err, 0);
1108 sprintf(conn->local_ip, "%pI4",
1109 &sock_in.sin_addr.s_addr);
1110 conn->local_port = ntohs(sock_in.sin_port);
1117 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1119 struct iscsi_login_req *login_req;
1120 u32 padding = 0, payload_length;
1122 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1125 login_req = (struct iscsi_login_req *)login->req;
1126 payload_length = ntoh24(login_req->dlength);
1127 padding = ((-payload_length) & 3);
1129 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1130 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1131 login_req->flags, login_req->itt, login_req->cmdsn,
1132 login_req->exp_statsn, login_req->cid, payload_length);
1134 * Setup the initial iscsi_login values from the leading
1135 * login request PDU.
1137 if (login->first_request) {
1138 login_req = (struct iscsi_login_req *)login->req;
1139 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1140 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1141 login->version_min = login_req->min_version;
1142 login->version_max = login_req->max_version;
1143 memcpy(login->isid, login_req->isid, 6);
1144 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1145 login->init_task_tag = login_req->itt;
1146 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1147 login->cid = be16_to_cpu(login_req->cid);
1148 login->tsih = be16_to_cpu(login_req->tsih);
1151 if (iscsi_target_check_login_request(conn, login) < 0)
1154 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1155 if (iscsi_login_rx_data(conn, login->req_buf,
1156 payload_length + padding) < 0)
1162 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1165 if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1172 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1177 conn->conn_transport = t;
1181 rc = try_module_get(t->owner);
1183 pr_err("try_module_get() failed for %s\n", t->name);
1187 conn->conn_transport = t;
1191 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1192 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1197 pr_err("iSCSI Login negotiation failed.\n");
1198 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1199 ISCSI_LOGIN_STATUS_INIT_ERR);
1200 if (!zero_tsih || !conn->sess)
1202 if (conn->sess->se_sess)
1203 transport_free_session(conn->sess->se_sess);
1204 if (conn->sess->session_index != 0) {
1205 spin_lock_bh(&sess_idr_lock);
1206 idr_remove(&sess_idr, conn->sess->session_index);
1207 spin_unlock_bh(&sess_idr_lock);
1209 kfree(conn->sess->sess_ops);
1214 iscsi_stop_login_thread_timer(np);
1216 * If login negotiation fails check if the Time2Retain timer
1217 * needs to be restarted.
1219 if (!zero_tsih && conn->sess) {
1220 spin_lock_bh(&conn->sess->conn_lock);
1221 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1222 struct se_portal_group *se_tpg =
1223 &conn->tpg->tpg_se_tpg;
1225 atomic_set(&conn->sess->session_continuation, 0);
1226 spin_unlock_bh(&conn->sess->conn_lock);
1227 spin_lock_bh(&se_tpg->session_lock);
1228 iscsit_start_time2retain_handler(conn->sess);
1229 spin_unlock_bh(&se_tpg->session_lock);
1231 spin_unlock_bh(&conn->sess->conn_lock);
1232 iscsit_dec_session_usage_count(conn->sess);
1235 if (!IS_ERR(conn->conn_rx_hash.tfm))
1236 crypto_free_hash(conn->conn_rx_hash.tfm);
1237 if (!IS_ERR(conn->conn_tx_hash.tfm))
1238 crypto_free_hash(conn->conn_tx_hash.tfm);
1240 free_cpumask_var(conn->conn_cpumask);
1242 kfree(conn->conn_ops);
1244 if (conn->param_list) {
1245 iscsi_release_param_list(conn->param_list);
1246 conn->param_list = NULL;
1248 iscsi_target_nego_release(conn);
1251 sock_release(conn->sock);
1255 if (conn->conn_transport->iscsit_wait_conn)
1256 conn->conn_transport->iscsit_wait_conn(conn);
1258 if (conn->conn_transport->iscsit_free_conn)
1259 conn->conn_transport->iscsit_free_conn(conn);
1261 iscsit_put_transport(conn->conn_transport);
1265 static int __iscsi_target_login_thread(struct iscsi_np *np)
1267 u8 *buffer, zero_tsih = 0;
1269 struct iscsi_conn *conn = NULL;
1270 struct iscsi_login *login;
1271 struct iscsi_portal_group *tpg = NULL;
1272 struct iscsi_login_req *pdu;
1273 struct iscsi_tpg_np *tpg_np;
1274 bool new_sess = false;
1276 flush_signals(current);
1278 spin_lock_bh(&np->np_thread_lock);
1279 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1280 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1281 complete(&np->np_restart_comp);
1282 } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1283 spin_unlock_bh(&np->np_thread_lock);
1286 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1288 spin_unlock_bh(&np->np_thread_lock);
1290 conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1292 pr_err("Could not allocate memory for"
1293 " new connection\n");
1294 /* Get another socket */
1297 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1298 conn->conn_state = TARG_CONN_STATE_FREE;
1300 if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1305 rc = np->np_transport->iscsit_accept_np(np, conn);
1306 if (rc == -ENOSYS) {
1307 complete(&np->np_restart_comp);
1308 iscsit_put_transport(conn->conn_transport);
1312 } else if (rc < 0) {
1313 spin_lock_bh(&np->np_thread_lock);
1314 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1315 spin_unlock_bh(&np->np_thread_lock);
1316 complete(&np->np_restart_comp);
1317 iscsit_put_transport(conn->conn_transport);
1320 /* Get another socket */
1323 spin_unlock_bh(&np->np_thread_lock);
1324 iscsit_put_transport(conn->conn_transport);
1330 * Perform the remaining iSCSI connection initialization items..
1332 login = iscsi_login_init_conn(conn);
1337 iscsi_start_login_thread_timer(np);
1339 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1340 conn->conn_state = TARG_CONN_STATE_XPT_UP;
1342 * This will process the first login request + payload..
1344 rc = np->np_transport->iscsit_get_login_rx(conn, login);
1350 buffer = &login->req[0];
1351 pdu = (struct iscsi_login_req *)buffer;
1353 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1354 * when Status-Class != 0.
1356 conn->login_itt = pdu->itt;
1358 spin_lock_bh(&np->np_thread_lock);
1359 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1360 spin_unlock_bh(&np->np_thread_lock);
1361 pr_err("iSCSI Network Portal on %s:%hu currently not"
1362 " active.\n", np->np_ip, np->np_port);
1363 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1364 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1367 spin_unlock_bh(&np->np_thread_lock);
1369 conn->network_transport = np->np_network_transport;
1371 pr_debug("Received iSCSI login request from %s on %s Network"
1372 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
1373 conn->local_ip, conn->local_port);
1375 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1376 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;
1378 if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1379 pdu->min_version) < 0)
1382 zero_tsih = (pdu->tsih == 0x0000);
1385 * This is the leading connection of a new session.
1386 * We wait until after authentication to check for
1387 * session reinstatement.
1389 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1393 * Add a new connection to an existing session.
1394 * We check for a non-existant session in
1395 * iscsi_login_non_zero_tsih_s2() below based
1396 * on ISID/TSIH, but wait until after authentication
1397 * to check for connection reinstatement, etc.
1399 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1403 * SessionType: Discovery
1405 * Locates Default Portal
1407 * SessionType: Normal
1409 * Locates Target Portal from NP -> Target IQN
1411 rc = iscsi_target_locate_portal(np, conn, login);
1416 login->zero_tsih = zero_tsih;
1418 conn->sess->se_sess->sup_prot_ops =
1419 conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1423 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1428 if (iscsi_login_zero_tsih_s2(conn) < 0)
1431 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1435 ret = iscsi_target_start_negotiation(login, conn);
1440 pr_err("struct iscsi_conn session pointer is NULL!\n");
1444 iscsi_stop_login_thread_timer(np);
1446 if (signal_pending(current))
1450 tpg_np = conn->tpg_np;
1452 ret = iscsi_post_login_handler(np, conn, zero_tsih);
1456 iscsit_deaccess_np(np, tpg, tpg_np);
1461 /* Get another socket */
1467 tpg_np = conn->tpg_np;
1468 iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1472 iscsit_deaccess_np(np, tpg, tpg_np);
1481 iscsi_stop_login_thread_timer(np);
1482 spin_lock_bh(&np->np_thread_lock);
1483 np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1484 spin_unlock_bh(&np->np_thread_lock);
1489 int iscsi_target_login_thread(void *arg)
1491 struct iscsi_np *np = arg;
1494 allow_signal(SIGINT);
1497 ret = __iscsi_target_login_thread(np);
1499 * We break and exit here unless another sock_accept() call