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);
253 * This is the leading connection of a new session,
254 * or session reinstatement.
256 static int iscsi_login_zero_tsih_s1(
257 struct iscsi_conn *conn,
260 struct iscsi_session *sess = NULL;
261 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
262 enum target_prot_op sup_pro_ops;
265 sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
267 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
268 ISCSI_LOGIN_STATUS_NO_RESOURCES);
269 pr_err("Could not allocate memory for session\n");
273 iscsi_login_set_conn_values(sess, conn, pdu->cid);
274 sess->init_task_tag = pdu->itt;
275 memcpy(&sess->isid, pdu->isid, 6);
276 sess->exp_cmd_sn = be32_to_cpu(pdu->cmdsn);
277 INIT_LIST_HEAD(&sess->sess_conn_list);
278 INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
279 INIT_LIST_HEAD(&sess->cr_active_list);
280 INIT_LIST_HEAD(&sess->cr_inactive_list);
281 init_completion(&sess->async_msg_comp);
282 init_completion(&sess->reinstatement_comp);
283 init_completion(&sess->session_wait_comp);
284 init_completion(&sess->session_waiting_on_uc_comp);
285 mutex_init(&sess->cmdsn_mutex);
286 spin_lock_init(&sess->conn_lock);
287 spin_lock_init(&sess->cr_a_lock);
288 spin_lock_init(&sess->cr_i_lock);
289 spin_lock_init(&sess->session_usage_lock);
290 spin_lock_init(&sess->ttt_lock);
292 idr_preload(GFP_KERNEL);
293 spin_lock_bh(&sess_idr_lock);
294 ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
296 sess->session_index = ret;
297 spin_unlock_bh(&sess_idr_lock);
301 pr_err("idr_alloc() for sess_idr failed\n");
302 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
303 ISCSI_LOGIN_STATUS_NO_RESOURCES);
308 sess->creation_time = get_jiffies_64();
310 * The FFP CmdSN window values will be allocated from the TPG's
311 * Initiator Node's ACL once the login has been successfully completed.
313 sess->max_cmd_sn = be32_to_cpu(pdu->cmdsn);
315 sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
316 if (!sess->sess_ops) {
317 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
318 ISCSI_LOGIN_STATUS_NO_RESOURCES);
319 pr_err("Unable to allocate memory for"
320 " struct iscsi_sess_ops.\n");
324 sup_pro_ops = conn->conn_transport->iscsit_get_sup_prot_ops(conn);
326 sess->se_sess = transport_init_session(sup_pro_ops);
327 if (IS_ERR(sess->se_sess)) {
328 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
329 ISCSI_LOGIN_STATUS_NO_RESOURCES);
337 static int iscsi_login_zero_tsih_s2(
338 struct iscsi_conn *conn)
340 struct iscsi_node_attrib *na;
341 struct iscsi_session *sess = conn->sess;
342 unsigned char buf[32];
345 sess->tpg = conn->tpg;
348 * Assign a new TPG Session Handle. Note this is protected with
349 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
351 sess->tsih = ++sess->tpg->ntsih;
353 sess->tsih = ++sess->tpg->ntsih;
356 * Create the default params from user defined values..
358 if (iscsi_copy_param_list(&conn->param_list,
359 conn->tpg->param_list, 1) < 0) {
360 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
361 ISCSI_LOGIN_STATUS_NO_RESOURCES);
365 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
368 iscsi_set_keys_to_negotiate(conn->param_list, iser);
370 if (sess->sess_ops->SessionType)
371 return iscsi_set_keys_irrelevant_for_discovery(
374 na = iscsit_tpg_get_node_attrib(sess);
377 * Need to send TargetPortalGroupTag back in first login response
378 * on any iSCSI connection where the Initiator provides TargetName.
379 * See 5.3.1. Login Phase Start
381 * In our case, we have already located the struct iscsi_tiqn at this point.
384 sprintf(buf, "TargetPortalGroupTag=%hu", sess->tpg->tpgt);
385 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
386 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
387 ISCSI_LOGIN_STATUS_NO_RESOURCES);
392 * Workaround for Initiators that have broken connection recovery logic.
394 * "We would really like to get rid of this." Linux-iSCSI.org team
397 sprintf(buf, "ErrorRecoveryLevel=%d", na->default_erl);
398 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
399 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
400 ISCSI_LOGIN_STATUS_NO_RESOURCES);
404 if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
407 * Set RDMAExtensions=Yes by default for iSER enabled network portals
410 struct iscsi_param *param;
411 unsigned long mrdsl, off;
414 sprintf(buf, "RDMAExtensions=Yes");
415 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
416 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
417 ISCSI_LOGIN_STATUS_NO_RESOURCES);
421 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
422 * Immediate Data + Unsolicitied Data-OUT if necessary..
424 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
427 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
428 ISCSI_LOGIN_STATUS_NO_RESOURCES);
431 rc = kstrtoul(param->value, 0, &mrdsl);
433 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
434 ISCSI_LOGIN_STATUS_NO_RESOURCES);
437 off = mrdsl % PAGE_SIZE;
441 if (mrdsl < PAGE_SIZE)
446 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
447 " to PAGE_SIZE\n", mrdsl);
449 sprintf(buf, "MaxRecvDataSegmentLength=%lu\n", mrdsl);
450 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
451 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
452 ISCSI_LOGIN_STATUS_NO_RESOURCES);
456 * ISER currently requires that ImmediateData + Unsolicited
457 * Data be disabled when protection / signature MRs are enabled.
460 if (sess->se_sess->sup_prot_ops &
461 (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
462 TARGET_PROT_DOUT_INSERT)) {
464 sprintf(buf, "ImmediateData=No");
465 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
466 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
467 ISCSI_LOGIN_STATUS_NO_RESOURCES);
471 sprintf(buf, "InitialR2T=Yes");
472 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
473 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
474 ISCSI_LOGIN_STATUS_NO_RESOURCES);
477 pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
478 " T10-PI enabled ISER session\n");
486 * Remove PSTATE_NEGOTIATE for the four FIM related keys.
487 * The Initiator node will be able to enable FIM by proposing them itself.
489 int iscsi_login_disable_FIM_keys(
490 struct iscsi_param_list *param_list,
491 struct iscsi_conn *conn)
493 struct iscsi_param *param;
495 param = iscsi_find_param_from_key("OFMarker", param_list);
497 pr_err("iscsi_find_param_from_key() for"
498 " OFMarker failed\n");
499 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
500 ISCSI_LOGIN_STATUS_NO_RESOURCES);
503 param->state &= ~PSTATE_NEGOTIATE;
505 param = iscsi_find_param_from_key("OFMarkInt", param_list);
507 pr_err("iscsi_find_param_from_key() for"
508 " IFMarker failed\n");
509 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
510 ISCSI_LOGIN_STATUS_NO_RESOURCES);
513 param->state &= ~PSTATE_NEGOTIATE;
515 param = iscsi_find_param_from_key("IFMarker", param_list);
517 pr_err("iscsi_find_param_from_key() for"
518 " IFMarker failed\n");
519 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
520 ISCSI_LOGIN_STATUS_NO_RESOURCES);
523 param->state &= ~PSTATE_NEGOTIATE;
525 param = iscsi_find_param_from_key("IFMarkInt", param_list);
527 pr_err("iscsi_find_param_from_key() for"
528 " IFMarker failed\n");
529 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
530 ISCSI_LOGIN_STATUS_NO_RESOURCES);
533 param->state &= ~PSTATE_NEGOTIATE;
538 static int iscsi_login_non_zero_tsih_s1(
539 struct iscsi_conn *conn,
542 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
544 iscsi_login_set_conn_values(NULL, conn, pdu->cid);
549 * Add a new connection to an existing session.
551 static int iscsi_login_non_zero_tsih_s2(
552 struct iscsi_conn *conn,
555 struct iscsi_portal_group *tpg = conn->tpg;
556 struct iscsi_session *sess = NULL, *sess_p = NULL;
557 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
558 struct se_session *se_sess, *se_sess_tmp;
559 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
562 spin_lock_bh(&se_tpg->session_lock);
563 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
566 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
567 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
568 atomic_read(&sess_p->session_logout) ||
569 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
571 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
572 (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
573 iscsit_inc_session_usage_count(sess_p);
574 iscsit_stop_time2retain_timer(sess_p);
579 spin_unlock_bh(&se_tpg->session_lock);
582 * If the Time2Retain handler has expired, the session is already gone.
585 pr_err("Initiator attempting to add a connection to"
586 " a non-existent session, rejecting iSCSI Login.\n");
587 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
588 ISCSI_LOGIN_STATUS_NO_SESSION);
593 * Stop the Time2Retain timer if this is a failed session, we restart
594 * the timer if the login is not successful.
596 spin_lock_bh(&sess->conn_lock);
597 if (sess->session_state == TARG_SESS_STATE_FAILED)
598 atomic_set(&sess->session_continuation, 1);
599 spin_unlock_bh(&sess->conn_lock);
601 iscsi_login_set_conn_values(sess, conn, pdu->cid);
603 if (iscsi_copy_param_list(&conn->param_list,
604 conn->tpg->param_list, 0) < 0) {
605 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
606 ISCSI_LOGIN_STATUS_NO_RESOURCES);
610 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
613 iscsi_set_keys_to_negotiate(conn->param_list, iser);
615 * Need to send TargetPortalGroupTag back in first login response
616 * on any iSCSI connection where the Initiator provides TargetName.
617 * See 5.3.1. Login Phase Start
619 * In our case, we have already located the struct iscsi_tiqn at this point.
622 sprintf(buf, "TargetPortalGroupTag=%hu", sess->tpg->tpgt);
623 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
624 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
625 ISCSI_LOGIN_STATUS_NO_RESOURCES);
629 return iscsi_login_disable_FIM_keys(conn->param_list, conn);
632 int iscsi_login_post_auth_non_zero_tsih(
633 struct iscsi_conn *conn,
637 struct iscsi_conn *conn_ptr = NULL;
638 struct iscsi_conn_recovery *cr = NULL;
639 struct iscsi_session *sess = conn->sess;
642 * By following item 5 in the login table, if we have found
643 * an existing ISID and a valid/existing TSIH and an existing
644 * CID we do connection reinstatement. Currently we dont not
645 * support it so we send back an non-zero status class to the
646 * initiator and release the new connection.
648 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
650 pr_err("Connection exists with CID %hu for %s,"
651 " performing connection reinstatement.\n",
652 conn_ptr->cid, sess->sess_ops->InitiatorName);
654 iscsit_connection_reinstatement_rcfr(conn_ptr);
655 iscsit_dec_conn_usage_count(conn_ptr);
659 * Check for any connection recovery entires containing CID.
660 * We use the original ExpStatSN sent in the first login request
661 * to acknowledge commands for the failed connection.
663 * Also note that an explict logout may have already been sent,
664 * but the response may not be sent due to additional connection
667 if (sess->sess_ops->ErrorRecoveryLevel == 2) {
668 cr = iscsit_get_inactive_connection_recovery_entry(
671 pr_debug("Performing implicit logout"
672 " for connection recovery on CID: %hu\n",
674 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
679 * Else we follow item 4 from the login table in that we have
680 * found an existing ISID and a valid/existing TSIH and a new
681 * CID we go ahead and continue to add a new connection to the
684 pr_debug("Adding CID %hu to existing session for %s.\n",
685 cid, sess->sess_ops->InitiatorName);
687 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
688 pr_err("Adding additional connection to this session"
689 " would exceed MaxConnections %d, login failed.\n",
690 sess->sess_ops->MaxConnections);
691 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
692 ISCSI_LOGIN_STATUS_ISID_ERROR);
699 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
701 struct iscsi_session *sess = conn->sess;
703 * FIXME: Unsolicitied NopIN support for ISER
705 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
708 if (!sess->sess_ops->SessionType)
709 iscsit_start_nopin_timer(conn);
712 int iscsi_post_login_handler(
714 struct iscsi_conn *conn,
718 struct iscsi_session *sess = conn->sess;
719 struct se_session *se_sess = sess->se_sess;
720 struct iscsi_portal_group *tpg = sess->tpg;
721 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
722 struct iscsi_thread_set *ts;
724 iscsit_inc_conn_usage_count(conn);
726 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
727 ISCSI_LOGIN_STATUS_ACCEPT);
729 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
730 conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
732 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
733 iscsit_set_sync_and_steering_values(conn);
735 * SCSI Initiator -> SCSI Target Port Mapping
737 ts = iscsi_get_thread_set();
739 iscsi_set_session_parameters(sess->sess_ops,
740 conn->param_list, 0);
741 iscsi_release_param_list(conn->param_list);
742 conn->param_list = NULL;
744 spin_lock_bh(&sess->conn_lock);
745 atomic_set(&sess->session_continuation, 0);
746 if (sess->session_state == TARG_SESS_STATE_FAILED) {
748 " TARG_SESS_STATE_LOGGED_IN.\n");
749 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
753 pr_debug("iSCSI Login successful on CID: %hu from %s to"
754 " %s:%hu,%hu\n", conn->cid, conn->login_ip,
755 conn->local_ip, conn->local_port, tpg->tpgt);
757 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
758 atomic_inc(&sess->nconn);
759 pr_debug("Incremented iSCSI Connection count to %hu"
760 " from node: %s\n", atomic_read(&sess->nconn),
761 sess->sess_ops->InitiatorName);
762 spin_unlock_bh(&sess->conn_lock);
764 iscsi_post_login_start_timers(conn);
766 iscsi_activate_thread_set(conn, ts);
768 * Determine CPU mask to ensure connection's RX and TX kthreads
769 * are scheduled on the same CPU.
771 iscsit_thread_get_cpumask(conn);
772 conn->conn_rx_reset_cpumask = 1;
773 conn->conn_tx_reset_cpumask = 1;
775 iscsit_dec_conn_usage_count(conn);
777 spin_lock_bh(&se_tpg->session_lock);
778 iscsit_stop_time2retain_timer(sess);
779 spin_unlock_bh(&se_tpg->session_lock);
781 iscsit_dec_session_usage_count(sess);
785 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
786 iscsi_release_param_list(conn->param_list);
787 conn->param_list = NULL;
789 iscsit_determine_maxcmdsn(sess);
791 spin_lock_bh(&se_tpg->session_lock);
792 __transport_register_session(&sess->tpg->tpg_se_tpg,
793 se_sess->se_node_acl, se_sess, sess);
794 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
795 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
797 pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
798 conn->cid, conn->login_ip, conn->local_ip, conn->local_port,
801 spin_lock_bh(&sess->conn_lock);
802 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
803 atomic_inc(&sess->nconn);
804 pr_debug("Incremented iSCSI Connection count to %hu from node:"
805 " %s\n", atomic_read(&sess->nconn),
806 sess->sess_ops->InitiatorName);
807 spin_unlock_bh(&sess->conn_lock);
809 sess->sid = tpg->sid++;
811 sess->sid = tpg->sid++;
812 pr_debug("Established iSCSI session from node: %s\n",
813 sess->sess_ops->InitiatorName);
817 tpg->tpg_tiqn->tiqn_nsessions++;
819 pr_debug("Incremented number of active iSCSI sessions to %u on"
820 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
821 spin_unlock_bh(&se_tpg->session_lock);
823 iscsi_post_login_start_timers(conn);
824 iscsi_activate_thread_set(conn, ts);
826 * Determine CPU mask to ensure connection's RX and TX kthreads
827 * are scheduled on the same CPU.
829 iscsit_thread_get_cpumask(conn);
830 conn->conn_rx_reset_cpumask = 1;
831 conn->conn_tx_reset_cpumask = 1;
833 iscsit_dec_conn_usage_count(conn);
838 static void iscsi_handle_login_thread_timeout(unsigned long data)
840 struct iscsi_np *np = (struct iscsi_np *) data;
842 spin_lock_bh(&np->np_thread_lock);
843 pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
844 np->np_ip, np->np_port);
846 if (np->np_login_timer_flags & ISCSI_TF_STOP) {
847 spin_unlock_bh(&np->np_thread_lock);
852 send_sig(SIGINT, np->np_thread, 1);
854 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
855 spin_unlock_bh(&np->np_thread_lock);
858 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
861 * This used the TA_LOGIN_TIMEOUT constant because at this
862 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
864 spin_lock_bh(&np->np_thread_lock);
865 init_timer(&np->np_login_timer);
866 np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
867 np->np_login_timer.data = (unsigned long)np;
868 np->np_login_timer.function = iscsi_handle_login_thread_timeout;
869 np->np_login_timer_flags &= ~ISCSI_TF_STOP;
870 np->np_login_timer_flags |= ISCSI_TF_RUNNING;
871 add_timer(&np->np_login_timer);
873 pr_debug("Added timeout timer to iSCSI login request for"
874 " %u seconds.\n", TA_LOGIN_TIMEOUT);
875 spin_unlock_bh(&np->np_thread_lock);
878 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
880 spin_lock_bh(&np->np_thread_lock);
881 if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
882 spin_unlock_bh(&np->np_thread_lock);
885 np->np_login_timer_flags |= ISCSI_TF_STOP;
886 spin_unlock_bh(&np->np_thread_lock);
888 del_timer_sync(&np->np_login_timer);
890 spin_lock_bh(&np->np_thread_lock);
891 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
892 spin_unlock_bh(&np->np_thread_lock);
897 struct __kernel_sockaddr_storage *sockaddr)
899 struct socket *sock = NULL;
900 int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
902 switch (np->np_network_transport) {
904 np->np_ip_proto = IPPROTO_TCP;
905 np->np_sock_type = SOCK_STREAM;
908 np->np_ip_proto = IPPROTO_SCTP;
909 np->np_sock_type = SOCK_STREAM;
912 np->np_ip_proto = IPPROTO_SCTP;
913 np->np_sock_type = SOCK_SEQPACKET;
916 pr_err("Unsupported network_transport: %d\n",
917 np->np_network_transport);
921 np->np_ip_proto = IPPROTO_TCP;
922 np->np_sock_type = SOCK_STREAM;
924 ret = sock_create(sockaddr->ss_family, np->np_sock_type,
925 np->np_ip_proto, &sock);
927 pr_err("sock_create() failed.\n");
930 np->np_socket = sock;
932 * Setup the np->np_sockaddr from the passed sockaddr setup
933 * in iscsi_target_configfs.c code..
935 memcpy(&np->np_sockaddr, sockaddr,
936 sizeof(struct __kernel_sockaddr_storage));
938 if (sockaddr->ss_family == AF_INET6)
939 len = sizeof(struct sockaddr_in6);
941 len = sizeof(struct sockaddr_in);
943 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
945 /* FIXME: Someone please explain why this is endian-safe */
947 if (np->np_network_transport == ISCSI_TCP) {
948 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
949 (char *)&opt, sizeof(opt));
951 pr_err("kernel_setsockopt() for TCP_NODELAY"
952 " failed: %d\n", ret);
957 /* FIXME: Someone please explain why this is endian-safe */
958 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
959 (char *)&opt, sizeof(opt));
961 pr_err("kernel_setsockopt() for SO_REUSEADDR"
966 ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
967 (char *)&opt, sizeof(opt));
969 pr_err("kernel_setsockopt() for IP_FREEBIND"
974 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
976 pr_err("kernel_bind() failed: %d\n", ret);
980 ret = kernel_listen(sock, backlog);
982 pr_err("kernel_listen() failed: %d\n", ret);
988 np->np_socket = NULL;
994 int iscsi_target_setup_login_socket(
996 struct __kernel_sockaddr_storage *sockaddr)
998 struct iscsit_transport *t;
1001 t = iscsit_get_transport(np->np_network_transport);
1005 rc = t->iscsit_setup_np(np, sockaddr);
1007 iscsit_put_transport(t);
1011 np->np_transport = t;
1016 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1018 struct socket *new_sock, *sock = np->np_socket;
1019 struct sockaddr_in sock_in;
1020 struct sockaddr_in6 sock_in6;
1023 rc = kernel_accept(sock, &new_sock, 0);
1027 conn->sock = new_sock;
1028 conn->login_family = np->np_sockaddr.ss_family;
1030 if (np->np_sockaddr.ss_family == AF_INET6) {
1031 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1033 rc = conn->sock->ops->getname(conn->sock,
1034 (struct sockaddr *)&sock_in6, &err, 1);
1036 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1037 snprintf(conn->login_ip, sizeof(conn->login_ip), "[%pI6c]",
1038 &sock_in6.sin6_addr.in6_u);
1040 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI4",
1041 &sock_in6.sin6_addr.s6_addr32[3]);
1042 conn->login_port = ntohs(sock_in6.sin6_port);
1045 rc = conn->sock->ops->getname(conn->sock,
1046 (struct sockaddr *)&sock_in6, &err, 0);
1048 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr))
1049 snprintf(conn->local_ip, sizeof(conn->local_ip), "[%pI6c]",
1050 &sock_in6.sin6_addr.in6_u);
1052 snprintf(conn->local_ip, sizeof(conn->local_ip), "%pI4",
1053 &sock_in6.sin6_addr.s6_addr32[3]);
1054 conn->local_port = ntohs(sock_in6.sin6_port);
1057 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1059 rc = conn->sock->ops->getname(conn->sock,
1060 (struct sockaddr *)&sock_in, &err, 1);
1062 sprintf(conn->login_ip, "%pI4",
1063 &sock_in.sin_addr.s_addr);
1064 conn->login_port = ntohs(sock_in.sin_port);
1067 rc = conn->sock->ops->getname(conn->sock,
1068 (struct sockaddr *)&sock_in, &err, 0);
1070 sprintf(conn->local_ip, "%pI4",
1071 &sock_in.sin_addr.s_addr);
1072 conn->local_port = ntohs(sock_in.sin_port);
1079 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1081 struct iscsi_login_req *login_req;
1082 u32 padding = 0, payload_length;
1084 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1087 login_req = (struct iscsi_login_req *)login->req;
1088 payload_length = ntoh24(login_req->dlength);
1089 padding = ((-payload_length) & 3);
1091 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1092 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1093 login_req->flags, login_req->itt, login_req->cmdsn,
1094 login_req->exp_statsn, login_req->cid, payload_length);
1096 * Setup the initial iscsi_login values from the leading
1097 * login request PDU.
1099 if (login->first_request) {
1100 login_req = (struct iscsi_login_req *)login->req;
1101 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1102 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1103 login->version_min = login_req->min_version;
1104 login->version_max = login_req->max_version;
1105 memcpy(login->isid, login_req->isid, 6);
1106 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1107 login->init_task_tag = login_req->itt;
1108 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1109 login->cid = be16_to_cpu(login_req->cid);
1110 login->tsih = be16_to_cpu(login_req->tsih);
1113 if (iscsi_target_check_login_request(conn, login) < 0)
1116 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1117 if (iscsi_login_rx_data(conn, login->req_buf,
1118 payload_length + padding) < 0)
1124 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1127 if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1134 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1139 conn->conn_transport = t;
1143 rc = try_module_get(t->owner);
1145 pr_err("try_module_get() failed for %s\n", t->name);
1149 conn->conn_transport = t;
1153 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1154 struct iscsi_np *np, bool zero_tsih, bool new_sess)
1156 if (new_sess == false)
1159 pr_err("iSCSI Login negotiation failed.\n");
1160 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1161 ISCSI_LOGIN_STATUS_INIT_ERR);
1162 if (!zero_tsih || !conn->sess)
1164 if (conn->sess->se_sess)
1165 transport_free_session(conn->sess->se_sess);
1166 if (conn->sess->session_index != 0) {
1167 spin_lock_bh(&sess_idr_lock);
1168 idr_remove(&sess_idr, conn->sess->session_index);
1169 spin_unlock_bh(&sess_idr_lock);
1171 kfree(conn->sess->sess_ops);
1175 iscsi_stop_login_thread_timer(np);
1177 * If login negotiation fails check if the Time2Retain timer
1178 * needs to be restarted.
1180 if (!zero_tsih && conn->sess) {
1181 spin_lock_bh(&conn->sess->conn_lock);
1182 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1183 struct se_portal_group *se_tpg =
1184 &conn->tpg->tpg_se_tpg;
1186 atomic_set(&conn->sess->session_continuation, 0);
1187 spin_unlock_bh(&conn->sess->conn_lock);
1188 spin_lock_bh(&se_tpg->session_lock);
1189 iscsit_start_time2retain_handler(conn->sess);
1190 spin_unlock_bh(&se_tpg->session_lock);
1192 spin_unlock_bh(&conn->sess->conn_lock);
1193 iscsit_dec_session_usage_count(conn->sess);
1196 if (!IS_ERR(conn->conn_rx_hash.tfm))
1197 crypto_free_hash(conn->conn_rx_hash.tfm);
1198 if (!IS_ERR(conn->conn_tx_hash.tfm))
1199 crypto_free_hash(conn->conn_tx_hash.tfm);
1201 if (conn->conn_cpumask)
1202 free_cpumask_var(conn->conn_cpumask);
1204 kfree(conn->conn_ops);
1206 if (conn->param_list) {
1207 iscsi_release_param_list(conn->param_list);
1208 conn->param_list = NULL;
1210 iscsi_target_nego_release(conn);
1213 sock_release(conn->sock);
1217 if (conn->conn_transport->iscsit_free_conn)
1218 conn->conn_transport->iscsit_free_conn(conn);
1220 iscsit_put_transport(conn->conn_transport);
1224 static int __iscsi_target_login_thread(struct iscsi_np *np)
1226 u8 *buffer, zero_tsih = 0;
1227 int ret = 0, rc, stop;
1228 struct iscsi_conn *conn = NULL;
1229 struct iscsi_login *login;
1230 struct iscsi_portal_group *tpg = NULL;
1231 struct iscsi_login_req *pdu;
1232 struct iscsi_tpg_np *tpg_np;
1233 bool new_sess = false;
1235 flush_signals(current);
1237 spin_lock_bh(&np->np_thread_lock);
1238 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1239 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1240 complete(&np->np_restart_comp);
1242 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1244 spin_unlock_bh(&np->np_thread_lock);
1246 conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1248 pr_err("Could not allocate memory for"
1249 " new connection\n");
1250 /* Get another socket */
1253 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1254 conn->conn_state = TARG_CONN_STATE_FREE;
1256 if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1261 rc = np->np_transport->iscsit_accept_np(np, conn);
1262 if (rc == -ENOSYS) {
1263 complete(&np->np_restart_comp);
1264 iscsit_put_transport(conn->conn_transport);
1268 } else if (rc < 0) {
1269 spin_lock_bh(&np->np_thread_lock);
1270 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
1271 spin_unlock_bh(&np->np_thread_lock);
1272 complete(&np->np_restart_comp);
1273 iscsit_put_transport(conn->conn_transport);
1278 /* Get another socket */
1281 spin_unlock_bh(&np->np_thread_lock);
1282 iscsit_put_transport(conn->conn_transport);
1288 * Perform the remaining iSCSI connection initialization items..
1290 login = iscsi_login_init_conn(conn);
1295 iscsi_start_login_thread_timer(np);
1297 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1298 conn->conn_state = TARG_CONN_STATE_XPT_UP;
1300 * This will process the first login request + payload..
1302 rc = np->np_transport->iscsit_get_login_rx(conn, login);
1308 buffer = &login->req[0];
1309 pdu = (struct iscsi_login_req *)buffer;
1311 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1312 * when Status-Class != 0.
1314 conn->login_itt = pdu->itt;
1316 spin_lock_bh(&np->np_thread_lock);
1317 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1318 spin_unlock_bh(&np->np_thread_lock);
1319 pr_err("iSCSI Network Portal on %s:%hu currently not"
1320 " active.\n", np->np_ip, np->np_port);
1321 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1322 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1325 spin_unlock_bh(&np->np_thread_lock);
1327 conn->network_transport = np->np_network_transport;
1329 pr_debug("Received iSCSI login request from %s on %s Network"
1330 " Portal %s:%hu\n", conn->login_ip, np->np_transport->name,
1331 conn->local_ip, conn->local_port);
1333 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1334 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;
1336 if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1337 pdu->min_version) < 0)
1340 zero_tsih = (pdu->tsih == 0x0000);
1343 * This is the leading connection of a new session.
1344 * We wait until after authentication to check for
1345 * session reinstatement.
1347 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1351 * Add a new connection to an existing session.
1352 * We check for a non-existant session in
1353 * iscsi_login_non_zero_tsih_s2() below based
1354 * on ISID/TSIH, but wait until after authentication
1355 * to check for connection reinstatement, etc.
1357 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1361 * SessionType: Discovery
1363 * Locates Default Portal
1365 * SessionType: Normal
1367 * Locates Target Portal from NP -> Target IQN
1369 rc = iscsi_target_locate_portal(np, conn, login);
1374 login->zero_tsih = zero_tsih;
1378 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1383 if (iscsi_login_zero_tsih_s2(conn) < 0)
1386 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1390 ret = iscsi_target_start_negotiation(login, conn);
1395 pr_err("struct iscsi_conn session pointer is NULL!\n");
1399 iscsi_stop_login_thread_timer(np);
1401 if (signal_pending(current))
1405 tpg_np = conn->tpg_np;
1407 ret = iscsi_post_login_handler(np, conn, zero_tsih);
1411 iscsit_deaccess_np(np, tpg, tpg_np);
1416 /* Get another socket */
1422 tpg_np = conn->tpg_np;
1423 iscsi_target_login_sess_out(conn, np, zero_tsih, new_sess);
1427 iscsit_deaccess_np(np, tpg, tpg_np);
1433 stop = kthread_should_stop();
1434 /* Wait for another socket.. */
1438 iscsi_stop_login_thread_timer(np);
1439 spin_lock_bh(&np->np_thread_lock);
1440 np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1441 spin_unlock_bh(&np->np_thread_lock);
1446 int iscsi_target_login_thread(void *arg)
1448 struct iscsi_np *np = arg;
1451 allow_signal(SIGINT);
1453 while (!kthread_should_stop()) {
1454 ret = __iscsi_target_login_thread(np);
1456 * We break and exit here unless another sock_accept() call