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 "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"
40 #include <target/iscsi/iscsi_transport.h>
42 static struct iscsi_login *iscsi_login_init_conn(struct iscsi_conn *conn)
44 struct iscsi_login *login;
46 login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
48 pr_err("Unable to allocate memory for struct iscsi_login.\n");
53 login->first_request = 1;
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");
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");
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");
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);
93 if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
94 pr_err("Unable to allocate conn->conn_cpumask\n");
97 conn->conn_login = login;
102 kfree(conn->conn_ops);
104 kfree(login->rsp_buf);
106 kfree(login->req_buf);
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
116 int iscsi_login_setup_crypto(struct iscsi_conn *conn)
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
123 conn->conn_rx_hash.flags = 0;
124 conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
126 if (IS_ERR(conn->conn_rx_hash.tfm)) {
127 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
131 conn->conn_tx_hash.flags = 0;
132 conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
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);
143 static int iscsi_login_check_initiator_version(
144 struct iscsi_conn *conn,
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);
160 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
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;
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);
179 sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
181 spin_lock_bh(&se_tpg->session_lock);
182 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
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);
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);
204 spin_unlock(&sess_p->conn_lock);
206 spin_unlock_bh(&se_tpg->session_lock);
208 * If the Time2Retain handler has expired, the session is already gone.
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);
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);
225 spin_unlock_bh(&sess->conn_lock);
227 iscsit_stop_session(sess, 1, 1);
228 iscsit_dec_session_usage_count(sess);
230 target_put_session(sess->se_sess);
234 static void iscsi_login_set_conn_values(
235 struct iscsi_session *sess,
236 struct iscsi_conn *conn,
240 conn->cid = be16_to_cpu(cid);
242 * Generate a random Status sequence number (statsn) for the new
245 get_random_bytes(&conn->stat_sn, sizeof(u32));
247 mutex_lock(&auth_id_lock);
248 conn->auth_id = iscsit_global->auth_id++;
249 mutex_unlock(&auth_id_lock);
252 static __printf(2, 3) int iscsi_change_param_sprintf(
253 struct iscsi_conn *conn,
254 const char *fmt, ...)
257 unsigned char buf[64];
259 memset(buf, 0, sizeof buf);
262 vsnprintf(buf, sizeof buf, fmt, args);
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);
275 * This is the leading connection of a new session,
276 * or session reinstatement.
278 static int iscsi_login_zero_tsih_s1(
279 struct iscsi_conn *conn,
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;
287 sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
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");
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);
314 idr_preload(GFP_KERNEL);
315 spin_lock_bh(&sess_idr_lock);
316 ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
318 sess->session_index = ret;
319 spin_unlock_bh(&sess_idr_lock);
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);
330 sess->creation_time = get_jiffies_64();
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.
335 sess->max_cmd_sn = be32_to_cpu(pdu->cmdsn);
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");
346 sup_pro_ops = conn->conn_transport->iscsit_get_sup_prot_ops(conn);
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);
359 static int iscsi_login_zero_tsih_s2(
360 struct iscsi_conn *conn)
362 struct iscsi_node_attrib *na;
363 struct iscsi_session *sess = conn->sess;
366 sess->tpg = conn->tpg;
369 * Assign a new TPG Session Handle. Note this is protected with
370 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
372 sess->tsih = ++sess->tpg->ntsih;
374 sess->tsih = ++sess->tpg->ntsih;
377 * Create the default params from user defined values..
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);
386 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
389 iscsi_set_keys_to_negotiate(conn->param_list, iser);
391 if (sess->sess_ops->SessionType)
392 return iscsi_set_keys_irrelevant_for_discovery(
395 na = iscsit_tpg_get_node_attrib(sess);
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
402 * In our case, we have already located the struct iscsi_tiqn at this point.
404 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
408 * Workaround for Initiators that have broken connection recovery logic.
410 * "We would really like to get rid of this." Linux-iSCSI.org team
412 if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
415 if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
418 * Set RDMAExtensions=Yes by default for iSER enabled network portals
421 struct iscsi_param *param;
422 unsigned long mrdsl, off;
425 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
429 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
430 * Immediate Data + Unsolicitied Data-OUT if necessary..
432 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
435 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
436 ISCSI_LOGIN_STATUS_NO_RESOURCES);
439 rc = kstrtoul(param->value, 0, &mrdsl);
441 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
442 ISCSI_LOGIN_STATUS_NO_RESOURCES);
445 off = mrdsl % PAGE_SIZE;
449 if (mrdsl < PAGE_SIZE)
454 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
455 " to PAGE_SIZE\n", mrdsl);
457 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
460 * ISER currently requires that ImmediateData + Unsolicited
461 * Data be disabled when protection / signature MRs are enabled.
464 if (sess->se_sess->sup_prot_ops &
465 (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
466 TARGET_PROT_DOUT_INSERT)) {
468 if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
471 if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
474 pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
475 " T10-PI enabled ISER session\n");
483 * Remove PSTATE_NEGOTIATE for the four FIM related keys.
484 * The Initiator node will be able to enable FIM by proposing them itself.
486 int iscsi_login_disable_FIM_keys(
487 struct iscsi_param_list *param_list,
488 struct iscsi_conn *conn)
490 struct iscsi_param *param;
492 param = iscsi_find_param_from_key("OFMarker", param_list);
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);
500 param->state &= ~PSTATE_NEGOTIATE;
502 param = iscsi_find_param_from_key("OFMarkInt", param_list);
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);
510 param->state &= ~PSTATE_NEGOTIATE;
512 param = iscsi_find_param_from_key("IFMarker", param_list);
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);
520 param->state &= ~PSTATE_NEGOTIATE;
522 param = iscsi_find_param_from_key("IFMarkInt", param_list);
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);
530 param->state &= ~PSTATE_NEGOTIATE;
535 static int iscsi_login_non_zero_tsih_s1(
536 struct iscsi_conn *conn,
539 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
541 iscsi_login_set_conn_values(NULL, conn, pdu->cid);
546 * Add a new connection to an existing session.
548 static int iscsi_login_non_zero_tsih_s2(
549 struct iscsi_conn *conn,
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;
559 spin_lock_bh(&se_tpg->session_lock);
560 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
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))
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);
576 spin_unlock_bh(&se_tpg->session_lock);
579 * If the Time2Retain handler has expired, the session is already gone.
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);
590 * Stop the Time2Retain timer if this is a failed session, we restart
591 * the timer if the login is not successful.
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);
598 iscsi_login_set_conn_values(sess, conn, pdu->cid);
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);
607 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
610 iscsi_set_keys_to_negotiate(conn->param_list, iser);
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
616 * In our case, we have already located the struct iscsi_tiqn at this point.
618 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
621 return iscsi_login_disable_FIM_keys(conn->param_list, conn);
624 int iscsi_login_post_auth_non_zero_tsih(
625 struct iscsi_conn *conn,
629 struct iscsi_conn *conn_ptr = NULL;
630 struct iscsi_conn_recovery *cr = NULL;
631 struct iscsi_session *sess = conn->sess;
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.
640 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
642 pr_err("Connection exists with CID %hu for %s,"
643 " performing connection reinstatement.\n",
644 conn_ptr->cid, sess->sess_ops->InitiatorName);
646 iscsit_connection_reinstatement_rcfr(conn_ptr);
647 iscsit_dec_conn_usage_count(conn_ptr);
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.
655 * Also note that an explict logout may have already been sent,
656 * but the response may not be sent due to additional connection
659 if (sess->sess_ops->ErrorRecoveryLevel == 2) {
660 cr = iscsit_get_inactive_connection_recovery_entry(
663 pr_debug("Performing implicit logout"
664 " for connection recovery on CID: %hu\n",
666 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
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
676 pr_debug("Adding CID %hu to existing session for %s.\n",
677 cid, sess->sess_ops->InitiatorName);
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);
691 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
693 struct iscsi_session *sess = conn->sess;
695 * FIXME: Unsolicitied NopIN support for ISER
697 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
700 if (!sess->sess_ops->SessionType)
701 iscsit_start_nopin_timer(conn);
704 int iscsi_post_login_handler(
706 struct iscsi_conn *conn,
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;
716 iscsit_inc_conn_usage_count(conn);
718 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
719 ISCSI_LOGIN_STATUS_ACCEPT);
721 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
722 conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
724 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
725 iscsit_set_sync_and_steering_values(conn);
727 * SCSI Initiator -> SCSI Target Port Mapping
729 ts = iscsi_get_thread_set();
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;
736 spin_lock_bh(&sess->conn_lock);
737 atomic_set(&sess->session_continuation, 0);
738 if (sess->session_state == TARG_SESS_STATE_FAILED) {
740 " TARG_SESS_STATE_LOGGED_IN.\n");
741 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
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);
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);
756 iscsi_post_login_start_timers(conn);
758 iscsi_activate_thread_set(conn, ts);
760 * Determine CPU mask to ensure connection's RX and TX kthreads
761 * are scheduled on the same CPU.
763 iscsit_thread_get_cpumask(conn);
764 conn->conn_rx_reset_cpumask = 1;
765 conn->conn_tx_reset_cpumask = 1;
767 iscsit_dec_conn_usage_count(conn);
769 spin_lock_bh(&se_tpg->session_lock);
770 iscsit_stop_time2retain_timer(sess);
771 spin_unlock_bh(&se_tpg->session_lock);
773 iscsit_dec_session_usage_count(sess);
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;
781 iscsit_determine_maxcmdsn(sess);
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;
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,
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);
801 sess->sid = tpg->sid++;
803 sess->sid = tpg->sid++;
804 pr_debug("Established iSCSI session from node: %s\n",
805 sess->sess_ops->InitiatorName);
809 tpg->tpg_tiqn->tiqn_nsessions++;
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);
815 iscsi_post_login_start_timers(conn);
816 iscsi_activate_thread_set(conn, ts);
818 * Determine CPU mask to ensure connection's RX and TX kthreads
819 * are scheduled on the same CPU.
821 iscsit_thread_get_cpumask(conn);
822 conn->conn_rx_reset_cpumask = 1;
823 conn->conn_tx_reset_cpumask = 1;
825 iscsit_dec_conn_usage_count(conn);
830 static void iscsi_handle_login_thread_timeout(unsigned long data)
832 struct iscsi_np *np = (struct iscsi_np *) data;
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);
838 if (np->np_login_timer_flags & ISCSI_TF_STOP) {
839 spin_unlock_bh(&np->np_thread_lock);
844 send_sig(SIGINT, np->np_thread, 1);
846 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
847 spin_unlock_bh(&np->np_thread_lock);
850 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
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
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);
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);
870 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
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);
877 np->np_login_timer_flags |= ISCSI_TF_STOP;
878 spin_unlock_bh(&np->np_thread_lock);
880 del_timer_sync(&np->np_login_timer);
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);
889 struct __kernel_sockaddr_storage *sockaddr)
891 struct socket *sock = NULL;
892 int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
894 switch (np->np_network_transport) {
896 np->np_ip_proto = IPPROTO_TCP;
897 np->np_sock_type = SOCK_STREAM;
900 np->np_ip_proto = IPPROTO_SCTP;
901 np->np_sock_type = SOCK_STREAM;
904 np->np_ip_proto = IPPROTO_SCTP;
905 np->np_sock_type = SOCK_SEQPACKET;
908 pr_err("Unsupported network_transport: %d\n",
909 np->np_network_transport);
913 np->np_ip_proto = IPPROTO_TCP;
914 np->np_sock_type = SOCK_STREAM;
916 ret = sock_create(sockaddr->ss_family, np->np_sock_type,
917 np->np_ip_proto, &sock);
919 pr_err("sock_create() failed.\n");
922 np->np_socket = sock;
924 * Setup the np->np_sockaddr from the passed sockaddr setup
925 * in iscsi_target_configfs.c code..
927 memcpy(&np->np_sockaddr, sockaddr,
928 sizeof(struct __kernel_sockaddr_storage));
930 if (sockaddr->ss_family == AF_INET6)
931 len = sizeof(struct sockaddr_in6);
933 len = sizeof(struct sockaddr_in);
935 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
937 /* FIXME: Someone please explain why this is endian-safe */
939 if (np->np_network_transport == ISCSI_TCP) {
940 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
941 (char *)&opt, sizeof(opt));
943 pr_err("kernel_setsockopt() for TCP_NODELAY"
944 " failed: %d\n", ret);
949 /* FIXME: Someone please explain why this is endian-safe */
950 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
951 (char *)&opt, sizeof(opt));
953 pr_err("kernel_setsockopt() for SO_REUSEADDR"
958 ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
959 (char *)&opt, sizeof(opt));
961 pr_err("kernel_setsockopt() for IP_FREEBIND"
966 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
968 pr_err("kernel_bind() failed: %d\n", ret);
972 ret = kernel_listen(sock, backlog);
974 pr_err("kernel_listen() failed: %d\n", ret);
980 np->np_socket = NULL;
985 int iscsi_target_setup_login_socket(
987 struct __kernel_sockaddr_storage *sockaddr)
989 struct iscsit_transport *t;
992 t = iscsit_get_transport(np->np_network_transport);
996 rc = t->iscsit_setup_np(np, sockaddr);
998 iscsit_put_transport(t);
1002 np->np_transport = t;
1007 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1009 struct socket *new_sock, *sock = np->np_socket;
1010 struct sockaddr_in sock_in;
1011 struct sockaddr_in6 sock_in6;
1014 rc = kernel_accept(sock, &new_sock, 0);
1018 conn->sock = new_sock;
1019 conn->login_family = np->np_sockaddr.ss_family;
1021 if (np->np_sockaddr.ss_family == AF_INET6) {
1022 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1024 rc = conn->sock->ops->getname(conn->sock,
1025 (struct sockaddr *)&sock_in6, &err, 1);
1027 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1028 snprintf(conn->login_ip, sizeof(conn->login_ip), "[%pI6c]",
1029 &sock_in6.sin6_addr.in6_u);
1031 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI4",
1032 &sock_in6.sin6_addr.s6_addr32[3]);
1033 conn->login_port = ntohs(sock_in6.sin6_port);
1036 rc = conn->sock->ops->getname(conn->sock,
1037 (struct sockaddr *)&sock_in6, &err, 0);
1039 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1040 snprintf(conn->local_ip, sizeof(conn->local_ip), "[%pI6c]",
1041 &sock_in6.sin6_addr.in6_u);
1043 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI4",
1044 &sock_in6.sin6_addr.s6_addr32[3]);
1045 conn->local_port = ntohs(sock_in6.sin6_port);
1048 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1050 rc = conn->sock->ops->getname(conn->sock,
1051 (struct sockaddr *)&sock_in, &err, 1);
1053 sprintf(conn->login_ip, "%pI4",
1054 &sock_in.sin_addr.s_addr);
1055 conn->login_port = ntohs(sock_in.sin_port);
1058 rc = conn->sock->ops->getname(conn->sock,
1059 (struct sockaddr *)&sock_in, &err, 0);
1061 sprintf(conn->local_ip, "%pI4",
1062 &sock_in.sin_addr.s_addr);
1063 conn->local_port = ntohs(sock_in.sin_port);
1070 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1072 struct iscsi_login_req *login_req;
1073 u32 padding = 0, payload_length;
1075 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1078 login_req = (struct iscsi_login_req *)login->req;
1079 payload_length = ntoh24(login_req->dlength);
1080 padding = ((-payload_length) & 3);
1082 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1083 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1084 login_req->flags, login_req->itt, login_req->cmdsn,
1085 login_req->exp_statsn, login_req->cid, payload_length);
1087 * Setup the initial iscsi_login values from the leading
1088 * login request PDU.
1090 if (login->first_request) {
1091 login_req = (struct iscsi_login_req *)login->req;
1092 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1093 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1094 login->version_min = login_req->min_version;
1095 login->version_max = login_req->max_version;
1096 memcpy(login->isid, login_req->isid, 6);
1097 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1098 login->init_task_tag = login_req->itt;
1099 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1100 login->cid = be16_to_cpu(login_req->cid);
1101 login->tsih = be16_to_cpu(login_req->tsih);
1104 if (iscsi_target_check_login_request(conn, login) < 0)
1107 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1108 if (iscsi_login_rx_data(conn, login->req_buf,
1109 payload_length + padding) < 0)
1115 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1118 if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1125 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1130 conn->conn_transport = t;
1134 rc = try_module_get(t->owner);
1136 pr_err("try_module_get() failed for %s\n", t->name);
1140 conn->conn_transport = t;
1144 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1145 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1150 pr_err("iSCSI Login negotiation failed.\n");
1151 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1152 ISCSI_LOGIN_STATUS_INIT_ERR);
1153 if (!zero_tsih || !conn->sess)
1155 if (conn->sess->se_sess)
1156 transport_free_session(conn->sess->se_sess);
1157 if (conn->sess->session_index != 0) {
1158 spin_lock_bh(&sess_idr_lock);
1159 idr_remove(&sess_idr, conn->sess->session_index);
1160 spin_unlock_bh(&sess_idr_lock);
1162 kfree(conn->sess->sess_ops);
1166 iscsi_stop_login_thread_timer(np);
1168 * If login negotiation fails check if the Time2Retain timer
1169 * needs to be restarted.
1171 if (!zero_tsih && conn->sess) {
1172 spin_lock_bh(&conn->sess->conn_lock);
1173 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1174 struct se_portal_group *se_tpg =
1175 &conn->tpg->tpg_se_tpg;
1177 atomic_set(&conn->sess->session_continuation, 0);
1178 spin_unlock_bh(&conn->sess->conn_lock);
1179 spin_lock_bh(&se_tpg->session_lock);
1180 iscsit_start_time2retain_handler(conn->sess);
1181 spin_unlock_bh(&se_tpg->session_lock);
1183 spin_unlock_bh(&conn->sess->conn_lock);
1184 iscsit_dec_session_usage_count(conn->sess);
1187 if (!IS_ERR(conn->conn_rx_hash.tfm))
1188 crypto_free_hash(conn->conn_rx_hash.tfm);
1189 if (!IS_ERR(conn->conn_tx_hash.tfm))
1190 crypto_free_hash(conn->conn_tx_hash.tfm);
1192 free_cpumask_var(conn->conn_cpumask);
1194 kfree(conn->conn_ops);
1196 if (conn->param_list) {
1197 iscsi_release_param_list(conn->param_list);
1198 conn->param_list = NULL;
1200 iscsi_target_nego_release(conn);
1203 sock_release(conn->sock);
1207 if (conn->conn_transport->iscsit_free_conn)
1208 conn->conn_transport->iscsit_free_conn(conn);
1210 iscsit_put_transport(conn->conn_transport);
1214 static int __iscsi_target_login_thread(struct iscsi_np *np)
1216 u8 *buffer, zero_tsih = 0;
1218 struct iscsi_conn *conn = NULL;
1219 struct iscsi_login *login;
1220 struct iscsi_portal_group *tpg = NULL;
1221 struct iscsi_login_req *pdu;
1222 struct iscsi_tpg_np *tpg_np;
1223 bool new_sess = false;
1225 flush_signals(current);
1227 spin_lock_bh(&np->np_thread_lock);
1228 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1229 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1230 complete(&np->np_restart_comp);
1231 } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1232 spin_unlock_bh(&np->np_thread_lock);
1235 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1237 spin_unlock_bh(&np->np_thread_lock);
1239 conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1241 pr_err("Could not allocate memory for"
1242 " new connection\n");
1243 /* Get another socket */
1246 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1247 conn->conn_state = TARG_CONN_STATE_FREE;
1249 if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1254 rc = np->np_transport->iscsit_accept_np(np, conn);
1255 if (rc == -ENOSYS) {
1256 complete(&np->np_restart_comp);
1257 iscsit_put_transport(conn->conn_transport);
1261 } else if (rc < 0) {
1262 spin_lock_bh(&np->np_thread_lock);
1263 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1264 spin_unlock_bh(&np->np_thread_lock);
1265 complete(&np->np_restart_comp);
1266 iscsit_put_transport(conn->conn_transport);
1269 /* Get another socket */
1272 spin_unlock_bh(&np->np_thread_lock);
1273 iscsit_put_transport(conn->conn_transport);
1279 * Perform the remaining iSCSI connection initialization items..
1281 login = iscsi_login_init_conn(conn);
1286 iscsi_start_login_thread_timer(np);
1288 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1289 conn->conn_state = TARG_CONN_STATE_XPT_UP;
1291 * This will process the first login request + payload..
1293 rc = np->np_transport->iscsit_get_login_rx(conn, login);
1299 buffer = &login->req[0];
1300 pdu = (struct iscsi_login_req *)buffer;
1302 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1303 * when Status-Class != 0.
1305 conn->login_itt = pdu->itt;
1307 spin_lock_bh(&np->np_thread_lock);
1308 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1309 spin_unlock_bh(&np->np_thread_lock);
1310 pr_err("iSCSI Network Portal on %s:%hu currently not"
1311 " active.\n", np->np_ip, np->np_port);
1312 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1313 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1316 spin_unlock_bh(&np->np_thread_lock);
1318 conn->network_transport = np->np_network_transport;
1320 pr_debug("Received iSCSI login request from %s on %s Network"
1321 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
1322 conn->local_ip, conn->local_port);
1324 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1325 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;
1327 if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1328 pdu->min_version) < 0)
1331 zero_tsih = (pdu->tsih == 0x0000);
1334 * This is the leading connection of a new session.
1335 * We wait until after authentication to check for
1336 * session reinstatement.
1338 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1342 * Add a new connection to an existing session.
1343 * We check for a non-existant session in
1344 * iscsi_login_non_zero_tsih_s2() below based
1345 * on ISID/TSIH, but wait until after authentication
1346 * to check for connection reinstatement, etc.
1348 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1352 * SessionType: Discovery
1354 * Locates Default Portal
1356 * SessionType: Normal
1358 * Locates Target Portal from NP -> Target IQN
1360 rc = iscsi_target_locate_portal(np, conn, login);
1365 login->zero_tsih = zero_tsih;
1369 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1374 if (iscsi_login_zero_tsih_s2(conn) < 0)
1377 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1381 ret = iscsi_target_start_negotiation(login, conn);
1386 pr_err("struct iscsi_conn session pointer is NULL!\n");
1390 iscsi_stop_login_thread_timer(np);
1392 if (signal_pending(current))
1396 tpg_np = conn->tpg_np;
1398 ret = iscsi_post_login_handler(np, conn, zero_tsih);
1402 iscsit_deaccess_np(np, tpg, tpg_np);
1407 /* Get another socket */
1413 tpg_np = conn->tpg_np;
1414 iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1418 iscsit_deaccess_np(np, tpg, tpg_np);
1427 iscsi_stop_login_thread_timer(np);
1428 spin_lock_bh(&np->np_thread_lock);
1429 np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1430 spin_unlock_bh(&np->np_thread_lock);
1435 int iscsi_target_login_thread(void *arg)
1437 struct iscsi_np *np = arg;
1440 allow_signal(SIGINT);
1443 ret = __iscsi_target_login_thread(np);
1445 * We break and exit here unless another sock_accept() call