1 /*******************************************************************************
2 * This file contains the login functions used by the iSCSI Target driver.
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 ******************************************************************************/
21 #include <linux/string.h>
22 #include <linux/kthread.h>
23 #include <linux/crypto.h>
24 #include <linux/idr.h>
25 #include <scsi/iscsi_proto.h>
26 #include <target/target_core_base.h>
27 #include <target/target_core_fabric.h>
29 #include "iscsi_target_core.h"
30 #include "iscsi_target_tq.h"
31 #include "iscsi_target_device.h"
32 #include "iscsi_target_nego.h"
33 #include "iscsi_target_erl0.h"
34 #include "iscsi_target_erl2.h"
35 #include "iscsi_target_login.h"
36 #include "iscsi_target_stat.h"
37 #include "iscsi_target_tpg.h"
38 #include "iscsi_target_util.h"
39 #include "iscsi_target.h"
40 #include "iscsi_target_parameters.h"
42 extern struct idr sess_idr
;
43 extern struct mutex auth_id_lock
;
44 extern spinlock_t sess_idr_lock
;
46 static int iscsi_login_init_conn(struct iscsi_conn
*conn
)
48 INIT_LIST_HEAD(&conn
->conn_list
);
49 INIT_LIST_HEAD(&conn
->conn_cmd_list
);
50 INIT_LIST_HEAD(&conn
->immed_queue_list
);
51 INIT_LIST_HEAD(&conn
->response_queue_list
);
52 init_completion(&conn
->conn_post_wait_comp
);
53 init_completion(&conn
->conn_wait_comp
);
54 init_completion(&conn
->conn_wait_rcfr_comp
);
55 init_completion(&conn
->conn_waiting_on_uc_comp
);
56 init_completion(&conn
->conn_logout_comp
);
57 init_completion(&conn
->rx_half_close_comp
);
58 init_completion(&conn
->tx_half_close_comp
);
59 spin_lock_init(&conn
->cmd_lock
);
60 spin_lock_init(&conn
->conn_usage_lock
);
61 spin_lock_init(&conn
->immed_queue_lock
);
62 spin_lock_init(&conn
->nopin_timer_lock
);
63 spin_lock_init(&conn
->response_queue_lock
);
64 spin_lock_init(&conn
->state_lock
);
66 if (!zalloc_cpumask_var(&conn
->conn_cpumask
, GFP_KERNEL
)) {
67 pr_err("Unable to allocate conn->conn_cpumask\n");
75 * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
76 * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
78 int iscsi_login_setup_crypto(struct iscsi_conn
*conn
)
81 * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
82 * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
83 * to software 1x8 byte slicing from crc32c.ko
85 conn
->conn_rx_hash
.flags
= 0;
86 conn
->conn_rx_hash
.tfm
= crypto_alloc_hash("crc32c", 0,
88 if (IS_ERR(conn
->conn_rx_hash
.tfm
)) {
89 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
93 conn
->conn_tx_hash
.flags
= 0;
94 conn
->conn_tx_hash
.tfm
= crypto_alloc_hash("crc32c", 0,
96 if (IS_ERR(conn
->conn_tx_hash
.tfm
)) {
97 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
98 crypto_free_hash(conn
->conn_rx_hash
.tfm
);
105 static int iscsi_login_check_initiator_version(
106 struct iscsi_conn
*conn
,
110 if ((version_max
!= 0x00) || (version_min
!= 0x00)) {
111 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
112 " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
113 version_min
, version_max
);
114 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
115 ISCSI_LOGIN_STATUS_NO_VERSION
);
122 int iscsi_check_for_session_reinstatement(struct iscsi_conn
*conn
)
125 struct iscsi_param
*initiatorname_param
= NULL
, *sessiontype_param
= NULL
;
126 struct iscsi_portal_group
*tpg
= conn
->tpg
;
127 struct iscsi_session
*sess
= NULL
, *sess_p
= NULL
;
128 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
129 struct se_session
*se_sess
, *se_sess_tmp
;
131 initiatorname_param
= iscsi_find_param_from_key(
132 INITIATORNAME
, conn
->param_list
);
133 if (!initiatorname_param
)
136 sessiontype_param
= iscsi_find_param_from_key(
137 SESSIONTYPE
, conn
->param_list
);
138 if (!sessiontype_param
)
141 sessiontype
= (strncmp(sessiontype_param
->value
, NORMAL
, 6)) ? 1 : 0;
143 spin_lock_bh(&se_tpg
->session_lock
);
144 list_for_each_entry_safe(se_sess
, se_sess_tmp
, &se_tpg
->tpg_sess_list
,
147 sess_p
= se_sess
->fabric_sess_ptr
;
148 spin_lock(&sess_p
->conn_lock
);
149 if (atomic_read(&sess_p
->session_fall_back_to_erl0
) ||
150 atomic_read(&sess_p
->session_logout
) ||
151 (sess_p
->time2retain_timer_flags
& ISCSI_TF_EXPIRED
)) {
152 spin_unlock(&sess_p
->conn_lock
);
155 if (!memcmp(sess_p
->isid
, conn
->sess
->isid
, 6) &&
156 (!strcmp(sess_p
->sess_ops
->InitiatorName
,
157 initiatorname_param
->value
) &&
158 (sess_p
->sess_ops
->SessionType
== sessiontype
))) {
159 atomic_set(&sess_p
->session_reinstatement
, 1);
160 spin_unlock(&sess_p
->conn_lock
);
161 iscsit_inc_session_usage_count(sess_p
);
162 iscsit_stop_time2retain_timer(sess_p
);
166 spin_unlock(&sess_p
->conn_lock
);
168 spin_unlock_bh(&se_tpg
->session_lock
);
170 * If the Time2Retain handler has expired, the session is already gone.
175 pr_debug("%s iSCSI Session SID %u is still active for %s,"
176 " preforming session reinstatement.\n", (sessiontype
) ?
177 "Discovery" : "Normal", sess
->sid
,
178 sess
->sess_ops
->InitiatorName
);
180 spin_lock_bh(&sess
->conn_lock
);
181 if (sess
->session_state
== TARG_SESS_STATE_FAILED
) {
182 spin_unlock_bh(&sess
->conn_lock
);
183 iscsit_dec_session_usage_count(sess
);
184 target_put_session(sess
->se_sess
);
187 spin_unlock_bh(&sess
->conn_lock
);
189 iscsit_stop_session(sess
, 1, 1);
190 iscsit_dec_session_usage_count(sess
);
192 target_put_session(sess
->se_sess
);
196 static void iscsi_login_set_conn_values(
197 struct iscsi_session
*sess
,
198 struct iscsi_conn
*conn
,
204 * Generate a random Status sequence number (statsn) for the new
207 get_random_bytes(&conn
->stat_sn
, sizeof(u32
));
209 mutex_lock(&auth_id_lock
);
210 conn
->auth_id
= iscsit_global
->auth_id
++;
211 mutex_unlock(&auth_id_lock
);
215 * This is the leading connection of a new session,
216 * or session reinstatement.
218 static int iscsi_login_zero_tsih_s1(
219 struct iscsi_conn
*conn
,
222 struct iscsi_session
*sess
= NULL
;
223 struct iscsi_login_req
*pdu
= (struct iscsi_login_req
*)buf
;
226 sess
= kzalloc(sizeof(struct iscsi_session
), GFP_KERNEL
);
228 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
229 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
230 pr_err("Could not allocate memory for session\n");
234 iscsi_login_set_conn_values(sess
, conn
, pdu
->cid
);
235 sess
->init_task_tag
= pdu
->itt
;
236 memcpy(&sess
->isid
, pdu
->isid
, 6);
237 sess
->exp_cmd_sn
= pdu
->cmdsn
;
238 INIT_LIST_HEAD(&sess
->sess_conn_list
);
239 INIT_LIST_HEAD(&sess
->sess_ooo_cmdsn_list
);
240 INIT_LIST_HEAD(&sess
->cr_active_list
);
241 INIT_LIST_HEAD(&sess
->cr_inactive_list
);
242 init_completion(&sess
->async_msg_comp
);
243 init_completion(&sess
->reinstatement_comp
);
244 init_completion(&sess
->session_wait_comp
);
245 init_completion(&sess
->session_waiting_on_uc_comp
);
246 mutex_init(&sess
->cmdsn_mutex
);
247 spin_lock_init(&sess
->conn_lock
);
248 spin_lock_init(&sess
->cr_a_lock
);
249 spin_lock_init(&sess
->cr_i_lock
);
250 spin_lock_init(&sess
->session_usage_lock
);
251 spin_lock_init(&sess
->ttt_lock
);
253 if (!idr_pre_get(&sess_idr
, GFP_KERNEL
)) {
254 pr_err("idr_pre_get() for sess_idr failed\n");
255 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
256 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
260 spin_lock(&sess_idr_lock
);
261 ret
= idr_get_new(&sess_idr
, NULL
, &sess
->session_index
);
262 spin_unlock(&sess_idr_lock
);
265 pr_err("idr_get_new() for sess_idr failed\n");
266 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
267 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
272 sess
->creation_time
= get_jiffies_64();
273 spin_lock_init(&sess
->session_stats_lock
);
275 * The FFP CmdSN window values will be allocated from the TPG's
276 * Initiator Node's ACL once the login has been successfully completed.
278 sess
->max_cmd_sn
= pdu
->cmdsn
;
280 sess
->sess_ops
= kzalloc(sizeof(struct iscsi_sess_ops
), GFP_KERNEL
);
281 if (!sess
->sess_ops
) {
282 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
283 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
284 pr_err("Unable to allocate memory for"
285 " struct iscsi_sess_ops.\n");
290 sess
->se_sess
= transport_init_session();
291 if (IS_ERR(sess
->se_sess
)) {
292 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
293 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
301 static int iscsi_login_zero_tsih_s2(
302 struct iscsi_conn
*conn
)
304 struct iscsi_node_attrib
*na
;
305 struct iscsi_session
*sess
= conn
->sess
;
306 unsigned char buf
[32];
308 sess
->tpg
= conn
->tpg
;
311 * Assign a new TPG Session Handle. Note this is protected with
312 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
314 sess
->tsih
= ++ISCSI_TPG_S(sess
)->ntsih
;
316 sess
->tsih
= ++ISCSI_TPG_S(sess
)->ntsih
;
319 * Create the default params from user defined values..
321 if (iscsi_copy_param_list(&conn
->param_list
,
322 ISCSI_TPG_C(conn
)->param_list
, 1) < 0) {
323 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
324 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
328 iscsi_set_keys_to_negotiate(0, conn
->param_list
);
330 if (sess
->sess_ops
->SessionType
)
331 return iscsi_set_keys_irrelevant_for_discovery(
334 na
= iscsit_tpg_get_node_attrib(sess
);
337 * Need to send TargetPortalGroupTag back in first login response
338 * on any iSCSI connection where the Initiator provides TargetName.
339 * See 5.3.1. Login Phase Start
341 * In our case, we have already located the struct iscsi_tiqn at this point.
344 sprintf(buf
, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess
)->tpgt
);
345 if (iscsi_change_param_value(buf
, conn
->param_list
, 0) < 0) {
346 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
347 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
352 * Workaround for Initiators that have broken connection recovery logic.
354 * "We would really like to get rid of this." Linux-iSCSI.org team
357 sprintf(buf
, "ErrorRecoveryLevel=%d", na
->default_erl
);
358 if (iscsi_change_param_value(buf
, conn
->param_list
, 0) < 0) {
359 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
360 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
364 if (iscsi_login_disable_FIM_keys(conn
->param_list
, conn
) < 0)
371 * Remove PSTATE_NEGOTIATE for the four FIM related keys.
372 * The Initiator node will be able to enable FIM by proposing them itself.
374 int iscsi_login_disable_FIM_keys(
375 struct iscsi_param_list
*param_list
,
376 struct iscsi_conn
*conn
)
378 struct iscsi_param
*param
;
380 param
= iscsi_find_param_from_key("OFMarker", param_list
);
382 pr_err("iscsi_find_param_from_key() for"
383 " OFMarker failed\n");
384 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
385 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
388 param
->state
&= ~PSTATE_NEGOTIATE
;
390 param
= iscsi_find_param_from_key("OFMarkInt", param_list
);
392 pr_err("iscsi_find_param_from_key() for"
393 " IFMarker failed\n");
394 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
395 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
398 param
->state
&= ~PSTATE_NEGOTIATE
;
400 param
= iscsi_find_param_from_key("IFMarker", param_list
);
402 pr_err("iscsi_find_param_from_key() for"
403 " IFMarker failed\n");
404 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
405 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
408 param
->state
&= ~PSTATE_NEGOTIATE
;
410 param
= iscsi_find_param_from_key("IFMarkInt", param_list
);
412 pr_err("iscsi_find_param_from_key() for"
413 " IFMarker failed\n");
414 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
415 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
418 param
->state
&= ~PSTATE_NEGOTIATE
;
423 static int iscsi_login_non_zero_tsih_s1(
424 struct iscsi_conn
*conn
,
427 struct iscsi_login_req
*pdu
= (struct iscsi_login_req
*)buf
;
429 iscsi_login_set_conn_values(NULL
, conn
, pdu
->cid
);
434 * Add a new connection to an existing session.
436 static int iscsi_login_non_zero_tsih_s2(
437 struct iscsi_conn
*conn
,
440 struct iscsi_portal_group
*tpg
= conn
->tpg
;
441 struct iscsi_session
*sess
= NULL
, *sess_p
= NULL
;
442 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
443 struct se_session
*se_sess
, *se_sess_tmp
;
444 struct iscsi_login_req
*pdu
= (struct iscsi_login_req
*)buf
;
446 spin_lock_bh(&se_tpg
->session_lock
);
447 list_for_each_entry_safe(se_sess
, se_sess_tmp
, &se_tpg
->tpg_sess_list
,
450 sess_p
= (struct iscsi_session
*)se_sess
->fabric_sess_ptr
;
451 if (atomic_read(&sess_p
->session_fall_back_to_erl0
) ||
452 atomic_read(&sess_p
->session_logout
) ||
453 (sess_p
->time2retain_timer_flags
& ISCSI_TF_EXPIRED
))
455 if (!memcmp(sess_p
->isid
, pdu
->isid
, 6) &&
456 (sess_p
->tsih
== pdu
->tsih
)) {
457 iscsit_inc_session_usage_count(sess_p
);
458 iscsit_stop_time2retain_timer(sess_p
);
463 spin_unlock_bh(&se_tpg
->session_lock
);
466 * If the Time2Retain handler has expired, the session is already gone.
469 pr_err("Initiator attempting to add a connection to"
470 " a non-existent session, rejecting iSCSI Login.\n");
471 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
472 ISCSI_LOGIN_STATUS_NO_SESSION
);
477 * Stop the Time2Retain timer if this is a failed session, we restart
478 * the timer if the login is not successful.
480 spin_lock_bh(&sess
->conn_lock
);
481 if (sess
->session_state
== TARG_SESS_STATE_FAILED
)
482 atomic_set(&sess
->session_continuation
, 1);
483 spin_unlock_bh(&sess
->conn_lock
);
485 iscsi_login_set_conn_values(sess
, conn
, pdu
->cid
);
487 if (iscsi_copy_param_list(&conn
->param_list
,
488 ISCSI_TPG_C(conn
)->param_list
, 0) < 0) {
489 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
490 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
494 iscsi_set_keys_to_negotiate(0, conn
->param_list
);
496 * Need to send TargetPortalGroupTag back in first login response
497 * on any iSCSI connection where the Initiator provides TargetName.
498 * See 5.3.1. Login Phase Start
500 * In our case, we have already located the struct iscsi_tiqn at this point.
503 sprintf(buf
, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess
)->tpgt
);
504 if (iscsi_change_param_value(buf
, conn
->param_list
, 0) < 0) {
505 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
506 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
510 return iscsi_login_disable_FIM_keys(conn
->param_list
, conn
);
513 int iscsi_login_post_auth_non_zero_tsih(
514 struct iscsi_conn
*conn
,
518 struct iscsi_conn
*conn_ptr
= NULL
;
519 struct iscsi_conn_recovery
*cr
= NULL
;
520 struct iscsi_session
*sess
= conn
->sess
;
523 * By following item 5 in the login table, if we have found
524 * an existing ISID and a valid/existing TSIH and an existing
525 * CID we do connection reinstatement. Currently we dont not
526 * support it so we send back an non-zero status class to the
527 * initiator and release the new connection.
529 conn_ptr
= iscsit_get_conn_from_cid_rcfr(sess
, cid
);
531 pr_err("Connection exists with CID %hu for %s,"
532 " performing connection reinstatement.\n",
533 conn_ptr
->cid
, sess
->sess_ops
->InitiatorName
);
535 iscsit_connection_reinstatement_rcfr(conn_ptr
);
536 iscsit_dec_conn_usage_count(conn_ptr
);
540 * Check for any connection recovery entires containing CID.
541 * We use the original ExpStatSN sent in the first login request
542 * to acknowledge commands for the failed connection.
544 * Also note that an explict logout may have already been sent,
545 * but the response may not be sent due to additional connection
548 if (sess
->sess_ops
->ErrorRecoveryLevel
== 2) {
549 cr
= iscsit_get_inactive_connection_recovery_entry(
552 pr_debug("Performing implicit logout"
553 " for connection recovery on CID: %hu\n",
555 iscsit_discard_cr_cmds_by_expstatsn(cr
, exp_statsn
);
560 * Else we follow item 4 from the login table in that we have
561 * found an existing ISID and a valid/existing TSIH and a new
562 * CID we go ahead and continue to add a new connection to the
565 pr_debug("Adding CID %hu to existing session for %s.\n",
566 cid
, sess
->sess_ops
->InitiatorName
);
568 if ((atomic_read(&sess
->nconn
) + 1) > sess
->sess_ops
->MaxConnections
) {
569 pr_err("Adding additional connection to this session"
570 " would exceed MaxConnections %d, login failed.\n",
571 sess
->sess_ops
->MaxConnections
);
572 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
573 ISCSI_LOGIN_STATUS_ISID_ERROR
);
580 static void iscsi_post_login_start_timers(struct iscsi_conn
*conn
)
582 struct iscsi_session
*sess
= conn
->sess
;
584 if (!sess
->sess_ops
->SessionType
)
585 iscsit_start_nopin_timer(conn
);
588 static int iscsi_post_login_handler(
590 struct iscsi_conn
*conn
,
594 struct iscsi_session
*sess
= conn
->sess
;
595 struct se_session
*se_sess
= sess
->se_sess
;
596 struct iscsi_portal_group
*tpg
= ISCSI_TPG_S(sess
);
597 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
598 struct iscsi_thread_set
*ts
;
600 iscsit_inc_conn_usage_count(conn
);
602 iscsit_collect_login_stats(conn
, ISCSI_STATUS_CLS_SUCCESS
,
603 ISCSI_LOGIN_STATUS_ACCEPT
);
605 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
606 conn
->conn_state
= TARG_CONN_STATE_LOGGED_IN
;
608 iscsi_set_connection_parameters(conn
->conn_ops
, conn
->param_list
);
609 iscsit_set_sync_and_steering_values(conn
);
611 * SCSI Initiator -> SCSI Target Port Mapping
613 ts
= iscsi_get_thread_set();
615 iscsi_set_session_parameters(sess
->sess_ops
,
616 conn
->param_list
, 0);
617 iscsi_release_param_list(conn
->param_list
);
618 conn
->param_list
= NULL
;
620 spin_lock_bh(&sess
->conn_lock
);
621 atomic_set(&sess
->session_continuation
, 0);
622 if (sess
->session_state
== TARG_SESS_STATE_FAILED
) {
624 " TARG_SESS_STATE_LOGGED_IN.\n");
625 sess
->session_state
= TARG_SESS_STATE_LOGGED_IN
;
629 pr_debug("iSCSI Login successful on CID: %hu from %s to"
630 " %s:%hu,%hu\n", conn
->cid
, conn
->login_ip
,
631 conn
->local_ip
, conn
->local_port
, tpg
->tpgt
);
633 list_add_tail(&conn
->conn_list
, &sess
->sess_conn_list
);
634 atomic_inc(&sess
->nconn
);
635 pr_debug("Incremented iSCSI Connection count to %hu"
636 " from node: %s\n", atomic_read(&sess
->nconn
),
637 sess
->sess_ops
->InitiatorName
);
638 spin_unlock_bh(&sess
->conn_lock
);
640 iscsi_post_login_start_timers(conn
);
641 iscsi_activate_thread_set(conn
, ts
);
643 * Determine CPU mask to ensure connection's RX and TX kthreads
644 * are scheduled on the same CPU.
646 iscsit_thread_get_cpumask(conn
);
647 conn
->conn_rx_reset_cpumask
= 1;
648 conn
->conn_tx_reset_cpumask
= 1;
650 iscsit_dec_conn_usage_count(conn
);
652 spin_lock_bh(&se_tpg
->session_lock
);
653 iscsit_stop_time2retain_timer(sess
);
654 spin_unlock_bh(&se_tpg
->session_lock
);
656 iscsit_dec_session_usage_count(sess
);
660 iscsi_set_session_parameters(sess
->sess_ops
, conn
->param_list
, 1);
661 iscsi_release_param_list(conn
->param_list
);
662 conn
->param_list
= NULL
;
664 iscsit_determine_maxcmdsn(sess
);
666 spin_lock_bh(&se_tpg
->session_lock
);
667 __transport_register_session(&sess
->tpg
->tpg_se_tpg
,
668 se_sess
->se_node_acl
, se_sess
, sess
);
669 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
670 sess
->session_state
= TARG_SESS_STATE_LOGGED_IN
;
672 pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
673 conn
->cid
, conn
->login_ip
, conn
->local_ip
, conn
->local_port
,
676 spin_lock_bh(&sess
->conn_lock
);
677 list_add_tail(&conn
->conn_list
, &sess
->sess_conn_list
);
678 atomic_inc(&sess
->nconn
);
679 pr_debug("Incremented iSCSI Connection count to %hu from node:"
680 " %s\n", atomic_read(&sess
->nconn
),
681 sess
->sess_ops
->InitiatorName
);
682 spin_unlock_bh(&sess
->conn_lock
);
684 sess
->sid
= tpg
->sid
++;
686 sess
->sid
= tpg
->sid
++;
687 pr_debug("Established iSCSI session from node: %s\n",
688 sess
->sess_ops
->InitiatorName
);
692 tpg
->tpg_tiqn
->tiqn_nsessions
++;
694 pr_debug("Incremented number of active iSCSI sessions to %u on"
695 " iSCSI Target Portal Group: %hu\n", tpg
->nsessions
, tpg
->tpgt
);
696 spin_unlock_bh(&se_tpg
->session_lock
);
698 iscsi_post_login_start_timers(conn
);
699 iscsi_activate_thread_set(conn
, ts
);
701 * Determine CPU mask to ensure connection's RX and TX kthreads
702 * are scheduled on the same CPU.
704 iscsit_thread_get_cpumask(conn
);
705 conn
->conn_rx_reset_cpumask
= 1;
706 conn
->conn_tx_reset_cpumask
= 1;
708 iscsit_dec_conn_usage_count(conn
);
713 static void iscsi_handle_login_thread_timeout(unsigned long data
)
715 struct iscsi_np
*np
= (struct iscsi_np
*) data
;
717 spin_lock_bh(&np
->np_thread_lock
);
718 pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
719 np
->np_ip
, np
->np_port
);
721 if (np
->np_login_timer_flags
& ISCSI_TF_STOP
) {
722 spin_unlock_bh(&np
->np_thread_lock
);
727 send_sig(SIGINT
, np
->np_thread
, 1);
729 np
->np_login_timer_flags
&= ~ISCSI_TF_RUNNING
;
730 spin_unlock_bh(&np
->np_thread_lock
);
733 static void iscsi_start_login_thread_timer(struct iscsi_np
*np
)
736 * This used the TA_LOGIN_TIMEOUT constant because at this
737 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
739 spin_lock_bh(&np
->np_thread_lock
);
740 init_timer(&np
->np_login_timer
);
741 np
->np_login_timer
.expires
= (get_jiffies_64() + TA_LOGIN_TIMEOUT
* HZ
);
742 np
->np_login_timer
.data
= (unsigned long)np
;
743 np
->np_login_timer
.function
= iscsi_handle_login_thread_timeout
;
744 np
->np_login_timer_flags
&= ~ISCSI_TF_STOP
;
745 np
->np_login_timer_flags
|= ISCSI_TF_RUNNING
;
746 add_timer(&np
->np_login_timer
);
748 pr_debug("Added timeout timer to iSCSI login request for"
749 " %u seconds.\n", TA_LOGIN_TIMEOUT
);
750 spin_unlock_bh(&np
->np_thread_lock
);
753 static void iscsi_stop_login_thread_timer(struct iscsi_np
*np
)
755 spin_lock_bh(&np
->np_thread_lock
);
756 if (!(np
->np_login_timer_flags
& ISCSI_TF_RUNNING
)) {
757 spin_unlock_bh(&np
->np_thread_lock
);
760 np
->np_login_timer_flags
|= ISCSI_TF_STOP
;
761 spin_unlock_bh(&np
->np_thread_lock
);
763 del_timer_sync(&np
->np_login_timer
);
765 spin_lock_bh(&np
->np_thread_lock
);
766 np
->np_login_timer_flags
&= ~ISCSI_TF_RUNNING
;
767 spin_unlock_bh(&np
->np_thread_lock
);
770 int iscsi_target_setup_login_socket(
772 struct __kernel_sockaddr_storage
*sockaddr
)
775 int backlog
= 5, ret
, opt
= 0, len
;
777 switch (np
->np_network_transport
) {
779 np
->np_ip_proto
= IPPROTO_TCP
;
780 np
->np_sock_type
= SOCK_STREAM
;
783 np
->np_ip_proto
= IPPROTO_SCTP
;
784 np
->np_sock_type
= SOCK_STREAM
;
787 np
->np_ip_proto
= IPPROTO_SCTP
;
788 np
->np_sock_type
= SOCK_SEQPACKET
;
790 case ISCSI_IWARP_TCP
:
791 case ISCSI_IWARP_SCTP
:
792 case ISCSI_INFINIBAND
:
794 pr_err("Unsupported network_transport: %d\n",
795 np
->np_network_transport
);
799 ret
= sock_create(sockaddr
->ss_family
, np
->np_sock_type
,
800 np
->np_ip_proto
, &sock
);
802 pr_err("sock_create() failed.\n");
805 np
->np_socket
= sock
;
807 * Setup the np->np_sockaddr from the passed sockaddr setup
808 * in iscsi_target_configfs.c code..
810 memcpy(&np
->np_sockaddr
, sockaddr
,
811 sizeof(struct __kernel_sockaddr_storage
));
813 if (sockaddr
->ss_family
== AF_INET6
)
814 len
= sizeof(struct sockaddr_in6
);
816 len
= sizeof(struct sockaddr_in
);
818 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
820 /* FIXME: Someone please explain why this is endian-safe */
822 if (np
->np_network_transport
== ISCSI_TCP
) {
823 ret
= kernel_setsockopt(sock
, IPPROTO_TCP
, TCP_NODELAY
,
824 (char *)&opt
, sizeof(opt
));
826 pr_err("kernel_setsockopt() for TCP_NODELAY"
827 " failed: %d\n", ret
);
832 /* FIXME: Someone please explain why this is endian-safe */
833 ret
= kernel_setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
,
834 (char *)&opt
, sizeof(opt
));
836 pr_err("kernel_setsockopt() for SO_REUSEADDR"
841 ret
= kernel_setsockopt(sock
, IPPROTO_IP
, IP_FREEBIND
,
842 (char *)&opt
, sizeof(opt
));
844 pr_err("kernel_setsockopt() for IP_FREEBIND"
849 ret
= kernel_bind(sock
, (struct sockaddr
*)&np
->np_sockaddr
, len
);
851 pr_err("kernel_bind() failed: %d\n", ret
);
855 ret
= kernel_listen(sock
, backlog
);
857 pr_err("kernel_listen() failed: %d\n", ret
);
864 np
->np_socket
= NULL
;
870 static int __iscsi_target_login_thread(struct iscsi_np
*np
)
872 u8 buffer
[ISCSI_HDR_LEN
], iscsi_opcode
, zero_tsih
= 0;
873 int err
, ret
= 0, stop
;
874 struct iscsi_conn
*conn
= NULL
;
875 struct iscsi_login
*login
;
876 struct iscsi_portal_group
*tpg
= NULL
;
877 struct socket
*new_sock
, *sock
;
879 struct iscsi_login_req
*pdu
;
880 struct sockaddr_in sock_in
;
881 struct sockaddr_in6 sock_in6
;
883 flush_signals(current
);
884 sock
= np
->np_socket
;
886 spin_lock_bh(&np
->np_thread_lock
);
887 if (np
->np_thread_state
== ISCSI_NP_THREAD_RESET
) {
888 np
->np_thread_state
= ISCSI_NP_THREAD_ACTIVE
;
889 complete(&np
->np_restart_comp
);
891 np
->np_thread_state
= ISCSI_NP_THREAD_ACTIVE
;
893 spin_unlock_bh(&np
->np_thread_lock
);
895 if (kernel_accept(sock
, &new_sock
, 0) < 0) {
896 spin_lock_bh(&np
->np_thread_lock
);
897 if (np
->np_thread_state
== ISCSI_NP_THREAD_RESET
) {
898 spin_unlock_bh(&np
->np_thread_lock
);
899 complete(&np
->np_restart_comp
);
900 /* Get another socket */
903 spin_unlock_bh(&np
->np_thread_lock
);
906 iscsi_start_login_thread_timer(np
);
908 conn
= kzalloc(sizeof(struct iscsi_conn
), GFP_KERNEL
);
910 pr_err("Could not allocate memory for"
911 " new connection\n");
912 sock_release(new_sock
);
913 /* Get another socket */
917 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
918 conn
->conn_state
= TARG_CONN_STATE_FREE
;
919 conn
->sock
= new_sock
;
921 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
922 conn
->conn_state
= TARG_CONN_STATE_XPT_UP
;
925 * Allocate conn->conn_ops early as a failure calling
926 * iscsit_tx_login_rsp() below will call tx_data().
928 conn
->conn_ops
= kzalloc(sizeof(struct iscsi_conn_ops
), GFP_KERNEL
);
929 if (!conn
->conn_ops
) {
930 pr_err("Unable to allocate memory for"
931 " struct iscsi_conn_ops.\n");
935 * Perform the remaining iSCSI connection initialization items..
937 if (iscsi_login_init_conn(conn
) < 0)
940 memset(buffer
, 0, ISCSI_HDR_LEN
);
941 memset(&iov
, 0, sizeof(struct kvec
));
942 iov
.iov_base
= buffer
;
943 iov
.iov_len
= ISCSI_HDR_LEN
;
945 if (rx_data(conn
, &iov
, 1, ISCSI_HDR_LEN
) <= 0) {
946 pr_err("rx_data() returned an error.\n");
950 iscsi_opcode
= (buffer
[0] & ISCSI_OPCODE_MASK
);
951 if (!(iscsi_opcode
& ISCSI_OP_LOGIN
)) {
952 pr_err("First opcode is not login request,"
953 " failing login request.\n");
957 pdu
= (struct iscsi_login_req
*) buffer
;
958 pdu
->cid
= be16_to_cpu(pdu
->cid
);
959 pdu
->tsih
= be16_to_cpu(pdu
->tsih
);
960 pdu
->itt
= be32_to_cpu(pdu
->itt
);
961 pdu
->cmdsn
= be32_to_cpu(pdu
->cmdsn
);
962 pdu
->exp_statsn
= be32_to_cpu(pdu
->exp_statsn
);
964 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
965 * when Status-Class != 0.
967 conn
->login_itt
= pdu
->itt
;
969 spin_lock_bh(&np
->np_thread_lock
);
970 if (np
->np_thread_state
!= ISCSI_NP_THREAD_ACTIVE
) {
971 spin_unlock_bh(&np
->np_thread_lock
);
972 pr_err("iSCSI Network Portal on %s:%hu currently not"
973 " active.\n", np
->np_ip
, np
->np_port
);
974 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
975 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE
);
978 spin_unlock_bh(&np
->np_thread_lock
);
980 if (np
->np_sockaddr
.ss_family
== AF_INET6
) {
981 memset(&sock_in6
, 0, sizeof(struct sockaddr_in6
));
983 if (conn
->sock
->ops
->getname(conn
->sock
,
984 (struct sockaddr
*)&sock_in6
, &err
, 1) < 0) {
985 pr_err("sock_ops->getname() failed.\n");
986 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
987 ISCSI_LOGIN_STATUS_TARGET_ERROR
);
990 snprintf(conn
->login_ip
, sizeof(conn
->login_ip
), "%pI6c",
991 &sock_in6
.sin6_addr
.in6_u
);
992 conn
->login_port
= ntohs(sock_in6
.sin6_port
);
994 if (conn
->sock
->ops
->getname(conn
->sock
,
995 (struct sockaddr
*)&sock_in6
, &err
, 0) < 0) {
996 pr_err("sock_ops->getname() failed.\n");
997 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
998 ISCSI_LOGIN_STATUS_TARGET_ERROR
);
1001 snprintf(conn
->local_ip
, sizeof(conn
->local_ip
), "%pI6c",
1002 &sock_in6
.sin6_addr
.in6_u
);
1003 conn
->local_port
= ntohs(sock_in6
.sin6_port
);
1006 memset(&sock_in
, 0, sizeof(struct sockaddr_in
));
1008 if (conn
->sock
->ops
->getname(conn
->sock
,
1009 (struct sockaddr
*)&sock_in
, &err
, 1) < 0) {
1010 pr_err("sock_ops->getname() failed.\n");
1011 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
1012 ISCSI_LOGIN_STATUS_TARGET_ERROR
);
1015 sprintf(conn
->login_ip
, "%pI4", &sock_in
.sin_addr
.s_addr
);
1016 conn
->login_port
= ntohs(sock_in
.sin_port
);
1018 if (conn
->sock
->ops
->getname(conn
->sock
,
1019 (struct sockaddr
*)&sock_in
, &err
, 0) < 0) {
1020 pr_err("sock_ops->getname() failed.\n");
1021 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
1022 ISCSI_LOGIN_STATUS_TARGET_ERROR
);
1025 sprintf(conn
->local_ip
, "%pI4", &sock_in
.sin_addr
.s_addr
);
1026 conn
->local_port
= ntohs(sock_in
.sin_port
);
1029 conn
->network_transport
= np
->np_network_transport
;
1031 pr_debug("Received iSCSI login request from %s on %s Network"
1032 " Portal %s:%hu\n", conn
->login_ip
,
1033 (conn
->network_transport
== ISCSI_TCP
) ? "TCP" : "SCTP",
1034 conn
->local_ip
, conn
->local_port
);
1036 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1037 conn
->conn_state
= TARG_CONN_STATE_IN_LOGIN
;
1039 if (iscsi_login_check_initiator_version(conn
, pdu
->max_version
,
1040 pdu
->min_version
) < 0)
1043 zero_tsih
= (pdu
->tsih
== 0x0000);
1046 * This is the leading connection of a new session.
1047 * We wait until after authentication to check for
1048 * session reinstatement.
1050 if (iscsi_login_zero_tsih_s1(conn
, buffer
) < 0)
1054 * Add a new connection to an existing session.
1055 * We check for a non-existant session in
1056 * iscsi_login_non_zero_tsih_s2() below based
1057 * on ISID/TSIH, but wait until after authentication
1058 * to check for connection reinstatement, etc.
1060 if (iscsi_login_non_zero_tsih_s1(conn
, buffer
) < 0)
1065 * This will process the first login request, and call
1066 * iscsi_target_locate_portal(), and return a valid struct iscsi_login.
1068 login
= iscsi_target_init_negotiation(np
, conn
, buffer
);
1076 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1081 if (iscsi_login_zero_tsih_s2(conn
) < 0) {
1082 iscsi_target_nego_release(login
, conn
);
1086 if (iscsi_login_non_zero_tsih_s2(conn
, buffer
) < 0) {
1087 iscsi_target_nego_release(login
, conn
);
1092 if (iscsi_target_start_negotiation(login
, conn
) < 0)
1096 pr_err("struct iscsi_conn session pointer is NULL!\n");
1100 iscsi_stop_login_thread_timer(np
);
1102 if (signal_pending(current
))
1105 ret
= iscsi_post_login_handler(np
, conn
, zero_tsih
);
1110 iscsit_deaccess_np(np
, tpg
);
1112 /* Get another socket */
1116 pr_err("iSCSI Login negotiation failed.\n");
1117 iscsit_collect_login_stats(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
1118 ISCSI_LOGIN_STATUS_INIT_ERR
);
1119 if (!zero_tsih
|| !conn
->sess
)
1121 if (conn
->sess
->se_sess
)
1122 transport_free_session(conn
->sess
->se_sess
);
1123 if (conn
->sess
->session_index
!= 0) {
1124 spin_lock_bh(&sess_idr_lock
);
1125 idr_remove(&sess_idr
, conn
->sess
->session_index
);
1126 spin_unlock_bh(&sess_idr_lock
);
1128 if (conn
->sess
->sess_ops
)
1129 kfree(conn
->sess
->sess_ops
);
1133 iscsi_stop_login_thread_timer(np
);
1135 * If login negotiation fails check if the Time2Retain timer
1136 * needs to be restarted.
1138 if (!zero_tsih
&& conn
->sess
) {
1139 spin_lock_bh(&conn
->sess
->conn_lock
);
1140 if (conn
->sess
->session_state
== TARG_SESS_STATE_FAILED
) {
1141 struct se_portal_group
*se_tpg
=
1142 &ISCSI_TPG_C(conn
)->tpg_se_tpg
;
1144 atomic_set(&conn
->sess
->session_continuation
, 0);
1145 spin_unlock_bh(&conn
->sess
->conn_lock
);
1146 spin_lock_bh(&se_tpg
->session_lock
);
1147 iscsit_start_time2retain_handler(conn
->sess
);
1148 spin_unlock_bh(&se_tpg
->session_lock
);
1150 spin_unlock_bh(&conn
->sess
->conn_lock
);
1151 iscsit_dec_session_usage_count(conn
->sess
);
1154 if (!IS_ERR(conn
->conn_rx_hash
.tfm
))
1155 crypto_free_hash(conn
->conn_rx_hash
.tfm
);
1156 if (!IS_ERR(conn
->conn_tx_hash
.tfm
))
1157 crypto_free_hash(conn
->conn_tx_hash
.tfm
);
1159 if (conn
->conn_cpumask
)
1160 free_cpumask_var(conn
->conn_cpumask
);
1162 kfree(conn
->conn_ops
);
1164 if (conn
->param_list
) {
1165 iscsi_release_param_list(conn
->param_list
);
1166 conn
->param_list
= NULL
;
1169 sock_release(conn
->sock
);
1173 iscsit_deaccess_np(np
, tpg
);
1178 stop
= kthread_should_stop();
1179 if (!stop
&& signal_pending(current
)) {
1180 spin_lock_bh(&np
->np_thread_lock
);
1181 stop
= (np
->np_thread_state
== ISCSI_NP_THREAD_SHUTDOWN
);
1182 spin_unlock_bh(&np
->np_thread_lock
);
1184 /* Wait for another socket.. */
1188 iscsi_stop_login_thread_timer(np
);
1189 spin_lock_bh(&np
->np_thread_lock
);
1190 np
->np_thread_state
= ISCSI_NP_THREAD_EXIT
;
1191 spin_unlock_bh(&np
->np_thread_lock
);
1195 int iscsi_target_login_thread(void *arg
)
1197 struct iscsi_np
*np
= arg
;
1200 allow_signal(SIGINT
);
1202 while (!kthread_should_stop()) {
1203 ret
= __iscsi_target_login_thread(np
);
1205 * We break and exit here unless another sock_accept() call