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 <crypto/hash.h>
20 #include <linux/string.h>
21 #include <linux/kthread.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 init_completion(&conn->rx_login_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)
118 struct crypto_ahash *tfm;
121 * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
122 * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
123 * to software 1x8 byte slicing from crc32c.ko
125 tfm = crypto_alloc_ahash("crc32c", 0, CRYPTO_ALG_ASYNC);
127 pr_err("crypto_alloc_ahash() failed\n");
131 conn->conn_rx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
132 if (!conn->conn_rx_hash) {
133 pr_err("ahash_request_alloc() failed for conn_rx_hash\n");
134 crypto_free_ahash(tfm);
137 ahash_request_set_callback(conn->conn_rx_hash, 0, NULL, NULL);
139 conn->conn_tx_hash = ahash_request_alloc(tfm, GFP_KERNEL);
140 if (!conn->conn_tx_hash) {
141 pr_err("ahash_request_alloc() failed for conn_tx_hash\n");
142 ahash_request_free(conn->conn_rx_hash);
143 conn->conn_rx_hash = NULL;
144 crypto_free_ahash(tfm);
147 ahash_request_set_callback(conn->conn_tx_hash, 0, NULL, NULL);
152 static int iscsi_login_check_initiator_version(
153 struct iscsi_conn *conn,
157 if ((version_max != 0x00) || (version_min != 0x00)) {
158 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
159 " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
160 version_min, version_max);
161 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
162 ISCSI_LOGIN_STATUS_NO_VERSION);
169 int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
172 struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
173 struct iscsi_portal_group *tpg = conn->tpg;
174 struct iscsi_session *sess = NULL, *sess_p = NULL;
175 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
176 struct se_session *se_sess, *se_sess_tmp;
178 initiatorname_param = iscsi_find_param_from_key(
179 INITIATORNAME, conn->param_list);
180 sessiontype_param = iscsi_find_param_from_key(
181 SESSIONTYPE, conn->param_list);
182 if (!initiatorname_param || !sessiontype_param) {
183 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
184 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
188 sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
190 spin_lock_bh(&se_tpg->session_lock);
191 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
194 sess_p = se_sess->fabric_sess_ptr;
195 spin_lock(&sess_p->conn_lock);
196 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
197 atomic_read(&sess_p->session_logout) ||
198 atomic_read(&sess_p->session_close) ||
199 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
200 spin_unlock(&sess_p->conn_lock);
203 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
204 (!strcmp(sess_p->sess_ops->InitiatorName,
205 initiatorname_param->value) &&
206 (sess_p->sess_ops->SessionType == sessiontype))) {
207 atomic_set(&sess_p->session_reinstatement, 1);
208 atomic_set(&sess_p->session_fall_back_to_erl0, 1);
209 atomic_set(&sess_p->session_close, 1);
210 spin_unlock(&sess_p->conn_lock);
211 iscsit_inc_session_usage_count(sess_p);
212 iscsit_stop_time2retain_timer(sess_p);
216 spin_unlock(&sess_p->conn_lock);
218 spin_unlock_bh(&se_tpg->session_lock);
220 * If the Time2Retain handler has expired, the session is already gone.
225 pr_debug("%s iSCSI Session SID %u is still active for %s,"
226 " preforming session reinstatement.\n", (sessiontype) ?
227 "Discovery" : "Normal", sess->sid,
228 sess->sess_ops->InitiatorName);
230 spin_lock_bh(&sess->conn_lock);
231 if (sess->session_state == TARG_SESS_STATE_FAILED) {
232 spin_unlock_bh(&sess->conn_lock);
233 iscsit_dec_session_usage_count(sess);
236 spin_unlock_bh(&sess->conn_lock);
238 iscsit_stop_session(sess, 1, 1);
239 iscsit_dec_session_usage_count(sess);
244 static void iscsi_login_set_conn_values(
245 struct iscsi_session *sess,
246 struct iscsi_conn *conn,
250 conn->cid = be16_to_cpu(cid);
252 * Generate a random Status sequence number (statsn) for the new
255 get_random_bytes(&conn->stat_sn, sizeof(u32));
257 mutex_lock(&auth_id_lock);
258 conn->auth_id = iscsit_global->auth_id++;
259 mutex_unlock(&auth_id_lock);
262 __printf(2, 3) int iscsi_change_param_sprintf(
263 struct iscsi_conn *conn,
264 const char *fmt, ...)
267 unsigned char buf[64];
269 memset(buf, 0, sizeof buf);
272 vsnprintf(buf, sizeof buf, fmt, args);
275 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
276 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
277 ISCSI_LOGIN_STATUS_NO_RESOURCES);
283 EXPORT_SYMBOL(iscsi_change_param_sprintf);
286 * This is the leading connection of a new session,
287 * or session reinstatement.
289 static int iscsi_login_zero_tsih_s1(
290 struct iscsi_conn *conn,
293 struct iscsi_session *sess = NULL;
294 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
297 sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
299 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
300 ISCSI_LOGIN_STATUS_NO_RESOURCES);
301 pr_err("Could not allocate memory for session\n");
305 iscsi_login_set_conn_values(sess, conn, pdu->cid);
306 sess->init_task_tag = pdu->itt;
307 memcpy(&sess->isid, pdu->isid, 6);
308 sess->exp_cmd_sn = be32_to_cpu(pdu->cmdsn);
309 INIT_LIST_HEAD(&sess->sess_conn_list);
310 INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
311 INIT_LIST_HEAD(&sess->cr_active_list);
312 INIT_LIST_HEAD(&sess->cr_inactive_list);
313 init_completion(&sess->async_msg_comp);
314 init_completion(&sess->reinstatement_comp);
315 init_completion(&sess->session_wait_comp);
316 init_completion(&sess->session_waiting_on_uc_comp);
317 mutex_init(&sess->cmdsn_mutex);
318 spin_lock_init(&sess->conn_lock);
319 spin_lock_init(&sess->cr_a_lock);
320 spin_lock_init(&sess->cr_i_lock);
321 spin_lock_init(&sess->session_usage_lock);
322 spin_lock_init(&sess->ttt_lock);
324 idr_preload(GFP_KERNEL);
325 spin_lock_bh(&sess_idr_lock);
326 ret = idr_alloc(&sess_idr, NULL, 0, 0, GFP_NOWAIT);
328 sess->session_index = ret;
329 spin_unlock_bh(&sess_idr_lock);
333 pr_err("idr_alloc() for sess_idr failed\n");
334 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
335 ISCSI_LOGIN_STATUS_NO_RESOURCES);
339 sess->creation_time = get_jiffies_64();
341 * The FFP CmdSN window values will be allocated from the TPG's
342 * Initiator Node's ACL once the login has been successfully completed.
344 atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
346 sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
347 if (!sess->sess_ops) {
348 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
349 ISCSI_LOGIN_STATUS_NO_RESOURCES);
350 pr_err("Unable to allocate memory for"
351 " struct iscsi_sess_ops.\n");
355 sess->se_sess = transport_init_session(TARGET_PROT_NORMAL);
356 if (IS_ERR(sess->se_sess)) {
357 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
358 ISCSI_LOGIN_STATUS_NO_RESOURCES);
365 kfree(sess->sess_ops);
367 spin_lock_bh(&sess_idr_lock);
368 idr_remove(&sess_idr, sess->session_index);
369 spin_unlock_bh(&sess_idr_lock);
376 static int iscsi_login_zero_tsih_s2(
377 struct iscsi_conn *conn)
379 struct iscsi_node_attrib *na;
380 struct iscsi_session *sess = conn->sess;
383 sess->tpg = conn->tpg;
386 * Assign a new TPG Session Handle. Note this is protected with
387 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
389 sess->tsih = ++sess->tpg->ntsih;
391 sess->tsih = ++sess->tpg->ntsih;
394 * Create the default params from user defined values..
396 if (iscsi_copy_param_list(&conn->param_list,
397 conn->tpg->param_list, 1) < 0) {
398 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
399 ISCSI_LOGIN_STATUS_NO_RESOURCES);
403 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
406 iscsi_set_keys_to_negotiate(conn->param_list, iser);
408 if (sess->sess_ops->SessionType)
409 return iscsi_set_keys_irrelevant_for_discovery(
412 na = iscsit_tpg_get_node_attrib(sess);
415 * Need to send TargetPortalGroupTag back in first login response
416 * on any iSCSI connection where the Initiator provides TargetName.
417 * See 5.3.1. Login Phase Start
419 * In our case, we have already located the struct iscsi_tiqn at this point.
421 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
425 * Workaround for Initiators that have broken connection recovery logic.
427 * "We would really like to get rid of this." Linux-iSCSI.org team
429 if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
433 * Set RDMAExtensions=Yes by default for iSER enabled network portals
436 struct iscsi_param *param;
437 unsigned long mrdsl, off;
440 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
444 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
445 * Immediate Data + Unsolicited Data-OUT if necessary..
447 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
450 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
451 ISCSI_LOGIN_STATUS_NO_RESOURCES);
454 rc = kstrtoul(param->value, 0, &mrdsl);
456 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
457 ISCSI_LOGIN_STATUS_NO_RESOURCES);
460 off = mrdsl % PAGE_SIZE;
464 if (mrdsl < PAGE_SIZE)
469 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
470 " to PAGE_SIZE\n", mrdsl);
472 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
475 * ISER currently requires that ImmediateData + Unsolicited
476 * Data be disabled when protection / signature MRs are enabled.
479 if (sess->se_sess->sup_prot_ops &
480 (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
481 TARGET_PROT_DOUT_INSERT)) {
483 if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
486 if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
489 pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
490 " T10-PI enabled ISER session\n");
497 static int iscsi_login_non_zero_tsih_s1(
498 struct iscsi_conn *conn,
501 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
503 iscsi_login_set_conn_values(NULL, conn, pdu->cid);
508 * Add a new connection to an existing session.
510 static int iscsi_login_non_zero_tsih_s2(
511 struct iscsi_conn *conn,
514 struct iscsi_portal_group *tpg = conn->tpg;
515 struct iscsi_session *sess = NULL, *sess_p = NULL;
516 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
517 struct se_session *se_sess, *se_sess_tmp;
518 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
521 spin_lock_bh(&se_tpg->session_lock);
522 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
525 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
526 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
527 atomic_read(&sess_p->session_logout) ||
528 atomic_read(&sess_p->session_close) ||
529 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
531 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
532 (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
533 iscsit_inc_session_usage_count(sess_p);
534 iscsit_stop_time2retain_timer(sess_p);
539 spin_unlock_bh(&se_tpg->session_lock);
542 * If the Time2Retain handler has expired, the session is already gone.
545 pr_err("Initiator attempting to add a connection to"
546 " a non-existent session, rejecting iSCSI Login.\n");
547 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
548 ISCSI_LOGIN_STATUS_NO_SESSION);
553 * Stop the Time2Retain timer if this is a failed session, we restart
554 * the timer if the login is not successful.
556 spin_lock_bh(&sess->conn_lock);
557 if (sess->session_state == TARG_SESS_STATE_FAILED)
558 atomic_set(&sess->session_continuation, 1);
559 spin_unlock_bh(&sess->conn_lock);
561 iscsi_login_set_conn_values(sess, conn, pdu->cid);
563 if (iscsi_copy_param_list(&conn->param_list,
564 conn->tpg->param_list, 0) < 0) {
565 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
566 ISCSI_LOGIN_STATUS_NO_RESOURCES);
570 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
573 iscsi_set_keys_to_negotiate(conn->param_list, iser);
575 * Need to send TargetPortalGroupTag back in first login response
576 * on any iSCSI connection where the Initiator provides TargetName.
577 * See 5.3.1. Login Phase Start
579 * In our case, we have already located the struct iscsi_tiqn at this point.
581 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
587 int iscsi_login_post_auth_non_zero_tsih(
588 struct iscsi_conn *conn,
592 struct iscsi_conn *conn_ptr = NULL;
593 struct iscsi_conn_recovery *cr = NULL;
594 struct iscsi_session *sess = conn->sess;
597 * By following item 5 in the login table, if we have found
598 * an existing ISID and a valid/existing TSIH and an existing
599 * CID we do connection reinstatement. Currently we dont not
600 * support it so we send back an non-zero status class to the
601 * initiator and release the new connection.
603 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
605 pr_err("Connection exists with CID %hu for %s,"
606 " performing connection reinstatement.\n",
607 conn_ptr->cid, sess->sess_ops->InitiatorName);
609 iscsit_connection_reinstatement_rcfr(conn_ptr);
610 iscsit_dec_conn_usage_count(conn_ptr);
614 * Check for any connection recovery entires containing CID.
615 * We use the original ExpStatSN sent in the first login request
616 * to acknowledge commands for the failed connection.
618 * Also note that an explict logout may have already been sent,
619 * but the response may not be sent due to additional connection
622 if (sess->sess_ops->ErrorRecoveryLevel == 2) {
623 cr = iscsit_get_inactive_connection_recovery_entry(
626 pr_debug("Performing implicit logout"
627 " for connection recovery on CID: %hu\n",
629 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
634 * Else we follow item 4 from the login table in that we have
635 * found an existing ISID and a valid/existing TSIH and a new
636 * CID we go ahead and continue to add a new connection to the
639 pr_debug("Adding CID %hu to existing session for %s.\n",
640 cid, sess->sess_ops->InitiatorName);
642 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
643 pr_err("Adding additional connection to this session"
644 " would exceed MaxConnections %d, login failed.\n",
645 sess->sess_ops->MaxConnections);
646 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
647 ISCSI_LOGIN_STATUS_ISID_ERROR);
654 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
656 struct iscsi_session *sess = conn->sess;
658 * FIXME: Unsolicited NopIN support for ISER
660 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
663 if (!sess->sess_ops->SessionType)
664 iscsit_start_nopin_timer(conn);
667 int iscsit_start_kthreads(struct iscsi_conn *conn)
671 spin_lock(&iscsit_global->ts_bitmap_lock);
672 conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
673 ISCSIT_BITMAP_BITS, get_order(1));
674 spin_unlock(&iscsit_global->ts_bitmap_lock);
676 if (conn->bitmap_id < 0) {
677 pr_err("bitmap_find_free_region() failed for"
678 " iscsit_start_kthreads()\n");
682 conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
683 "%s", ISCSI_TX_THREAD_NAME);
684 if (IS_ERR(conn->tx_thread)) {
685 pr_err("Unable to start iscsi_target_tx_thread\n");
686 ret = PTR_ERR(conn->tx_thread);
689 conn->tx_thread_active = true;
691 conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
692 "%s", ISCSI_RX_THREAD_NAME);
693 if (IS_ERR(conn->rx_thread)) {
694 pr_err("Unable to start iscsi_target_rx_thread\n");
695 ret = PTR_ERR(conn->rx_thread);
698 conn->rx_thread_active = true;
702 send_sig(SIGINT, conn->tx_thread, 1);
703 kthread_stop(conn->tx_thread);
704 conn->tx_thread_active = false;
706 spin_lock(&iscsit_global->ts_bitmap_lock);
707 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
709 spin_unlock(&iscsit_global->ts_bitmap_lock);
713 void iscsi_post_login_handler(
715 struct iscsi_conn *conn,
719 struct iscsi_session *sess = conn->sess;
720 struct se_session *se_sess = sess->se_sess;
721 struct iscsi_portal_group *tpg = sess->tpg;
722 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
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);
734 * SCSI Initiator -> SCSI Target Port Mapping
737 iscsi_set_session_parameters(sess->sess_ops,
738 conn->param_list, 0);
739 iscsi_release_param_list(conn->param_list);
740 conn->param_list = NULL;
742 spin_lock_bh(&sess->conn_lock);
743 atomic_set(&sess->session_continuation, 0);
744 if (sess->session_state == TARG_SESS_STATE_FAILED) {
746 " TARG_SESS_STATE_LOGGED_IN.\n");
747 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
751 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
752 " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
753 &conn->local_sockaddr, tpg->tpgt);
755 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
756 atomic_inc(&sess->nconn);
757 pr_debug("Incremented iSCSI Connection count to %hu"
758 " from node: %s\n", atomic_read(&sess->nconn),
759 sess->sess_ops->InitiatorName);
760 spin_unlock_bh(&sess->conn_lock);
762 iscsi_post_login_start_timers(conn);
764 * Determine CPU mask to ensure connection's RX and TX kthreads
765 * are scheduled on the same CPU.
767 iscsit_thread_get_cpumask(conn);
768 conn->conn_rx_reset_cpumask = 1;
769 conn->conn_tx_reset_cpumask = 1;
771 * Wakeup the sleeping iscsi_target_rx_thread() now that
772 * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
774 complete(&conn->rx_login_comp);
775 iscsit_dec_conn_usage_count(conn);
778 spin_lock_bh(&se_tpg->session_lock);
779 iscsit_stop_time2retain_timer(sess);
780 spin_unlock_bh(&se_tpg->session_lock);
782 iscsit_dec_session_usage_count(sess);
786 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
787 iscsi_release_param_list(conn->param_list);
788 conn->param_list = NULL;
790 iscsit_determine_maxcmdsn(sess);
792 spin_lock_bh(&se_tpg->session_lock);
793 __transport_register_session(&sess->tpg->tpg_se_tpg,
794 se_sess->se_node_acl, se_sess, sess);
795 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
796 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
798 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
799 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
802 spin_lock_bh(&sess->conn_lock);
803 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
804 atomic_inc(&sess->nconn);
805 pr_debug("Incremented iSCSI Connection count to %hu from node:"
806 " %s\n", atomic_read(&sess->nconn),
807 sess->sess_ops->InitiatorName);
808 spin_unlock_bh(&sess->conn_lock);
810 sess->sid = tpg->sid++;
812 sess->sid = tpg->sid++;
813 pr_debug("Established iSCSI session from node: %s\n",
814 sess->sess_ops->InitiatorName);
818 tpg->tpg_tiqn->tiqn_nsessions++;
820 pr_debug("Incremented number of active iSCSI sessions to %u on"
821 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
822 spin_unlock_bh(&se_tpg->session_lock);
824 iscsi_post_login_start_timers(conn);
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 * Wakeup the sleeping iscsi_target_rx_thread() now that
834 * iscsi_conn is in TARG_CONN_STATE_LOGGED_IN state.
836 complete(&conn->rx_login_comp);
837 iscsit_dec_conn_usage_count(conn);
840 static void iscsi_handle_login_thread_timeout(unsigned long data)
842 struct iscsi_np *np = (struct iscsi_np *) data;
844 spin_lock_bh(&np->np_thread_lock);
845 pr_err("iSCSI Login timeout on Network Portal %pISpc\n",
848 if (np->np_login_timer_flags & ISCSI_TF_STOP) {
849 spin_unlock_bh(&np->np_thread_lock);
854 send_sig(SIGINT, np->np_thread, 1);
856 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
857 spin_unlock_bh(&np->np_thread_lock);
860 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
863 * This used the TA_LOGIN_TIMEOUT constant because at this
864 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
866 spin_lock_bh(&np->np_thread_lock);
867 init_timer(&np->np_login_timer);
868 np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
869 np->np_login_timer.data = (unsigned long)np;
870 np->np_login_timer.function = iscsi_handle_login_thread_timeout;
871 np->np_login_timer_flags &= ~ISCSI_TF_STOP;
872 np->np_login_timer_flags |= ISCSI_TF_RUNNING;
873 add_timer(&np->np_login_timer);
875 pr_debug("Added timeout timer to iSCSI login request for"
876 " %u seconds.\n", TA_LOGIN_TIMEOUT);
877 spin_unlock_bh(&np->np_thread_lock);
880 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
882 spin_lock_bh(&np->np_thread_lock);
883 if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
884 spin_unlock_bh(&np->np_thread_lock);
887 np->np_login_timer_flags |= ISCSI_TF_STOP;
888 spin_unlock_bh(&np->np_thread_lock);
890 del_timer_sync(&np->np_login_timer);
892 spin_lock_bh(&np->np_thread_lock);
893 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
894 spin_unlock_bh(&np->np_thread_lock);
899 struct sockaddr_storage *sockaddr)
901 struct socket *sock = NULL;
902 int backlog = ISCSIT_TCP_BACKLOG, ret, opt = 0, len;
904 switch (np->np_network_transport) {
906 np->np_ip_proto = IPPROTO_TCP;
907 np->np_sock_type = SOCK_STREAM;
910 np->np_ip_proto = IPPROTO_SCTP;
911 np->np_sock_type = SOCK_STREAM;
914 np->np_ip_proto = IPPROTO_SCTP;
915 np->np_sock_type = SOCK_SEQPACKET;
918 pr_err("Unsupported network_transport: %d\n",
919 np->np_network_transport);
923 np->np_ip_proto = IPPROTO_TCP;
924 np->np_sock_type = SOCK_STREAM;
926 ret = sock_create(sockaddr->ss_family, np->np_sock_type,
927 np->np_ip_proto, &sock);
929 pr_err("sock_create() failed.\n");
932 np->np_socket = sock;
934 * Setup the np->np_sockaddr from the passed sockaddr setup
935 * in iscsi_target_configfs.c code..
937 memcpy(&np->np_sockaddr, sockaddr,
938 sizeof(struct sockaddr_storage));
940 if (sockaddr->ss_family == AF_INET6)
941 len = sizeof(struct sockaddr_in6);
943 len = sizeof(struct sockaddr_in);
945 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
947 /* FIXME: Someone please explain why this is endian-safe */
949 if (np->np_network_transport == ISCSI_TCP) {
950 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
951 (char *)&opt, sizeof(opt));
953 pr_err("kernel_setsockopt() for TCP_NODELAY"
954 " failed: %d\n", ret);
959 /* FIXME: Someone please explain why this is endian-safe */
960 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
961 (char *)&opt, sizeof(opt));
963 pr_err("kernel_setsockopt() for SO_REUSEADDR"
968 ret = kernel_setsockopt(sock, IPPROTO_IP, IP_FREEBIND,
969 (char *)&opt, sizeof(opt));
971 pr_err("kernel_setsockopt() for IP_FREEBIND"
976 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
978 pr_err("kernel_bind() failed: %d\n", ret);
982 ret = kernel_listen(sock, backlog);
984 pr_err("kernel_listen() failed: %d\n", ret);
990 np->np_socket = NULL;
995 int iscsi_target_setup_login_socket(
997 struct sockaddr_storage *sockaddr)
999 struct iscsit_transport *t;
1002 t = iscsit_get_transport(np->np_network_transport);
1006 rc = t->iscsit_setup_np(np, sockaddr);
1008 iscsit_put_transport(t);
1012 np->np_transport = t;
1017 int iscsit_accept_np(struct iscsi_np *np, struct iscsi_conn *conn)
1019 struct socket *new_sock, *sock = np->np_socket;
1020 struct sockaddr_in sock_in;
1021 struct sockaddr_in6 sock_in6;
1024 rc = kernel_accept(sock, &new_sock, 0);
1028 conn->sock = new_sock;
1029 conn->login_family = np->np_sockaddr.ss_family;
1031 if (np->np_sockaddr.ss_family == AF_INET6) {
1032 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1034 rc = conn->sock->ops->getname(conn->sock,
1035 (struct sockaddr *)&sock_in6, &err, 1);
1037 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1038 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
1040 /* Pretend to be an ipv4 socket */
1041 sock_in.sin_family = AF_INET;
1042 sock_in.sin_port = sock_in6.sin6_port;
1043 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1044 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1048 rc = conn->sock->ops->getname(conn->sock,
1049 (struct sockaddr *)&sock_in6, &err, 0);
1051 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
1052 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
1054 /* Pretend to be an ipv4 socket */
1055 sock_in.sin_family = AF_INET;
1056 sock_in.sin_port = sock_in6.sin6_port;
1057 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
1058 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1062 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1064 rc = conn->sock->ops->getname(conn->sock,
1065 (struct sockaddr *)&sock_in, &err, 1);
1067 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
1069 rc = conn->sock->ops->getname(conn->sock,
1070 (struct sockaddr *)&sock_in, &err, 0);
1072 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
1078 int iscsit_get_login_rx(struct iscsi_conn *conn, struct iscsi_login *login)
1080 struct iscsi_login_req *login_req;
1081 u32 padding = 0, payload_length;
1083 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
1086 login_req = (struct iscsi_login_req *)login->req;
1087 payload_length = ntoh24(login_req->dlength);
1088 padding = ((-payload_length) & 3);
1090 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
1091 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
1092 login_req->flags, login_req->itt, login_req->cmdsn,
1093 login_req->exp_statsn, login_req->cid, payload_length);
1095 * Setup the initial iscsi_login values from the leading
1096 * login request PDU.
1098 if (login->first_request) {
1099 login_req = (struct iscsi_login_req *)login->req;
1100 login->leading_connection = (!login_req->tsih) ? 1 : 0;
1101 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
1102 login->version_min = login_req->min_version;
1103 login->version_max = login_req->max_version;
1104 memcpy(login->isid, login_req->isid, 6);
1105 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
1106 login->init_task_tag = login_req->itt;
1107 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
1108 login->cid = be16_to_cpu(login_req->cid);
1109 login->tsih = be16_to_cpu(login_req->tsih);
1112 if (iscsi_target_check_login_request(conn, login) < 0)
1115 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
1116 if (iscsi_login_rx_data(conn, login->req_buf,
1117 payload_length + padding) < 0)
1123 int iscsit_put_login_tx(struct iscsi_conn *conn, struct iscsi_login *login,
1126 if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
1133 iscsit_conn_set_transport(struct iscsi_conn *conn, struct iscsit_transport *t)
1138 conn->conn_transport = t;
1142 rc = try_module_get(t->owner);
1144 pr_err("try_module_get() failed for %s\n", t->name);
1148 conn->conn_transport = t;
1152 void iscsi_target_login_sess_out(struct iscsi_conn *conn,
1153 bool zero_tsih, bool new_sess)
1158 pr_err("iSCSI Login negotiation failed.\n");
1159 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1160 ISCSI_LOGIN_STATUS_INIT_ERR);
1161 if (!zero_tsih || !conn->sess)
1164 transport_free_session(conn->sess->se_sess);
1166 spin_lock_bh(&sess_idr_lock);
1167 idr_remove(&sess_idr, conn->sess->session_index);
1168 spin_unlock_bh(&sess_idr_lock);
1170 kfree(conn->sess->sess_ops);
1176 * If login negotiation fails check if the Time2Retain timer
1177 * needs to be restarted.
1179 if (!zero_tsih && conn->sess) {
1180 spin_lock_bh(&conn->sess->conn_lock);
1181 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1182 struct se_portal_group *se_tpg =
1183 &conn->tpg->tpg_se_tpg;
1185 atomic_set(&conn->sess->session_continuation, 0);
1186 spin_unlock_bh(&conn->sess->conn_lock);
1187 spin_lock_bh(&se_tpg->session_lock);
1188 iscsit_start_time2retain_handler(conn->sess);
1189 spin_unlock_bh(&se_tpg->session_lock);
1191 spin_unlock_bh(&conn->sess->conn_lock);
1192 iscsit_dec_session_usage_count(conn->sess);
1195 ahash_request_free(conn->conn_tx_hash);
1196 if (conn->conn_rx_hash) {
1197 struct crypto_ahash *tfm;
1199 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
1200 ahash_request_free(conn->conn_rx_hash);
1201 crypto_free_ahash(tfm);
1204 free_cpumask_var(conn->conn_cpumask);
1206 kfree(conn->conn_ops);
1208 if (conn->param_list) {
1209 iscsi_release_param_list(conn->param_list);
1210 conn->param_list = NULL;
1212 iscsi_target_nego_release(conn);
1215 sock_release(conn->sock);
1219 if (conn->conn_transport->iscsit_wait_conn)
1220 conn->conn_transport->iscsit_wait_conn(conn);
1222 if (conn->conn_transport->iscsit_free_conn)
1223 conn->conn_transport->iscsit_free_conn(conn);
1225 iscsit_put_transport(conn->conn_transport);
1229 static int __iscsi_target_login_thread(struct iscsi_np *np)
1231 u8 *buffer, zero_tsih = 0;
1233 struct iscsi_conn *conn = NULL;
1234 struct iscsi_login *login;
1235 struct iscsi_portal_group *tpg = NULL;
1236 struct iscsi_login_req *pdu;
1237 struct iscsi_tpg_np *tpg_np;
1238 bool new_sess = false;
1240 flush_signals(current);
1242 spin_lock_bh(&np->np_thread_lock);
1243 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1244 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1245 spin_unlock_bh(&np->np_thread_lock);
1246 complete(&np->np_restart_comp);
1248 } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1249 spin_unlock_bh(&np->np_thread_lock);
1252 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1254 spin_unlock_bh(&np->np_thread_lock);
1256 conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
1258 pr_err("Could not allocate memory for"
1259 " new connection\n");
1260 /* Get another socket */
1263 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1264 conn->conn_state = TARG_CONN_STATE_FREE;
1266 if (iscsit_conn_set_transport(conn, np->np_transport) < 0) {
1271 rc = np->np_transport->iscsit_accept_np(np, conn);
1272 if (rc == -ENOSYS) {
1273 complete(&np->np_restart_comp);
1274 iscsit_put_transport(conn->conn_transport);
1278 } else if (rc < 0) {
1279 spin_lock_bh(&np->np_thread_lock);
1280 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1281 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1282 spin_unlock_bh(&np->np_thread_lock);
1283 complete(&np->np_restart_comp);
1284 iscsit_put_transport(conn->conn_transport);
1287 /* Get another socket */
1290 spin_unlock_bh(&np->np_thread_lock);
1291 iscsit_put_transport(conn->conn_transport);
1297 * Perform the remaining iSCSI connection initialization items..
1299 login = iscsi_login_init_conn(conn);
1304 iscsi_start_login_thread_timer(np);
1306 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1307 conn->conn_state = TARG_CONN_STATE_XPT_UP;
1309 * This will process the first login request + payload..
1311 rc = np->np_transport->iscsit_get_login_rx(conn, login);
1317 buffer = &login->req[0];
1318 pdu = (struct iscsi_login_req *)buffer;
1320 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1321 * when Status-Class != 0.
1323 conn->login_itt = pdu->itt;
1325 spin_lock_bh(&np->np_thread_lock);
1326 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1327 spin_unlock_bh(&np->np_thread_lock);
1328 pr_err("iSCSI Network Portal on %pISpc currently not"
1329 " active.\n", &np->np_sockaddr);
1330 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1331 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1334 spin_unlock_bh(&np->np_thread_lock);
1336 conn->network_transport = np->np_network_transport;
1338 pr_debug("Received iSCSI login request from %pISpc on %s Network"
1339 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
1340 &conn->local_sockaddr);
1342 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1343 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;
1345 if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1346 pdu->min_version) < 0)
1349 zero_tsih = (pdu->tsih == 0x0000);
1352 * This is the leading connection of a new session.
1353 * We wait until after authentication to check for
1354 * session reinstatement.
1356 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1360 * Add a new connection to an existing session.
1361 * We check for a non-existant session in
1362 * iscsi_login_non_zero_tsih_s2() below based
1363 * on ISID/TSIH, but wait until after authentication
1364 * to check for connection reinstatement, etc.
1366 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1370 * SessionType: Discovery
1372 * Locates Default Portal
1374 * SessionType: Normal
1376 * Locates Target Portal from NP -> Target IQN
1378 rc = iscsi_target_locate_portal(np, conn, login);
1383 login->zero_tsih = zero_tsih;
1386 conn->sess->se_sess->sup_prot_ops =
1387 conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1391 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1396 if (iscsi_login_zero_tsih_s2(conn) < 0)
1399 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1403 if (conn->conn_transport->iscsit_validate_params) {
1404 ret = conn->conn_transport->iscsit_validate_params(conn);
1413 ret = iscsi_target_start_negotiation(login, conn);
1417 iscsi_stop_login_thread_timer(np);
1420 tpg_np = conn->tpg_np;
1422 iscsi_post_login_handler(np, conn, zero_tsih);
1423 iscsit_deaccess_np(np, tpg, tpg_np);
1428 /* Get another socket */
1434 iscsi_stop_login_thread_timer(np);
1435 tpg_np = conn->tpg_np;
1436 iscsi_target_login_sess_out(conn, zero_tsih, new_sess);
1440 iscsit_deaccess_np(np, tpg, tpg_np);
1449 iscsi_stop_login_thread_timer(np);
1450 spin_lock_bh(&np->np_thread_lock);
1451 np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1452 spin_unlock_bh(&np->np_thread_lock);
1457 int iscsi_target_login_thread(void *arg)
1459 struct iscsi_np *np = arg;
1462 allow_signal(SIGINT);
1465 ret = __iscsi_target_login_thread(np);
1467 * We break and exit here unless another sock_accept() call
1474 while (!kthread_should_stop()) {