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 <scsi/iscsi_proto.h>
25 #include <target/target_core_base.h>
26 #include <target/target_core_transport.h>
28 #include "iscsi_target_core.h"
29 #include "iscsi_target_tq.h"
30 #include "iscsi_target_device.h"
31 #include "iscsi_target_nego.h"
32 #include "iscsi_target_erl0.h"
33 #include "iscsi_target_erl2.h"
34 #include "iscsi_target_login.h"
35 #include "iscsi_target_stat.h"
36 #include "iscsi_target_tpg.h"
37 #include "iscsi_target_util.h"
38 #include "iscsi_target.h"
39 #include "iscsi_target_parameters.h"
41 extern struct idr sess_idr
;
42 extern struct mutex auth_id_lock
;
43 extern spinlock_t sess_idr_lock
;
45 static int iscsi_login_init_conn(struct iscsi_conn
*conn
)
47 INIT_LIST_HEAD(&conn
->conn_list
);
48 INIT_LIST_HEAD(&conn
->conn_cmd_list
);
49 INIT_LIST_HEAD(&conn
->immed_queue_list
);
50 INIT_LIST_HEAD(&conn
->response_queue_list
);
51 init_completion(&conn
->conn_post_wait_comp
);
52 init_completion(&conn
->conn_wait_comp
);
53 init_completion(&conn
->conn_wait_rcfr_comp
);
54 init_completion(&conn
->conn_waiting_on_uc_comp
);
55 init_completion(&conn
->conn_logout_comp
);
56 init_completion(&conn
->rx_half_close_comp
);
57 init_completion(&conn
->tx_half_close_comp
);
58 spin_lock_init(&conn
->cmd_lock
);
59 spin_lock_init(&conn
->conn_usage_lock
);
60 spin_lock_init(&conn
->immed_queue_lock
);
61 spin_lock_init(&conn
->nopin_timer_lock
);
62 spin_lock_init(&conn
->response_queue_lock
);
63 spin_lock_init(&conn
->state_lock
);
65 if (!zalloc_cpumask_var(&conn
->conn_cpumask
, GFP_KERNEL
)) {
66 pr_err("Unable to allocate conn->conn_cpumask\n");
74 * Used by iscsi_target_nego.c:iscsi_target_locate_portal() to setup
75 * per struct iscsi_conn libcrypto contexts for crc32c and crc32-intel
77 int iscsi_login_setup_crypto(struct iscsi_conn
*conn
)
80 * Setup slicing by CRC32C algorithm for RX and TX libcrypto contexts
81 * which will default to crc32c_intel.ko for cpu_has_xmm4_2, or fallback
82 * to software 1x8 byte slicing from crc32c.ko
84 conn
->conn_rx_hash
.flags
= 0;
85 conn
->conn_rx_hash
.tfm
= crypto_alloc_hash("crc32c", 0,
87 if (IS_ERR(conn
->conn_rx_hash
.tfm
)) {
88 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
92 conn
->conn_tx_hash
.flags
= 0;
93 conn
->conn_tx_hash
.tfm
= crypto_alloc_hash("crc32c", 0,
95 if (IS_ERR(conn
->conn_tx_hash
.tfm
)) {
96 pr_err("crypto_alloc_hash() failed for conn_tx_tfm\n");
97 crypto_free_hash(conn
->conn_rx_hash
.tfm
);
104 static int iscsi_login_check_initiator_version(
105 struct iscsi_conn
*conn
,
109 if ((version_max
!= 0x00) || (version_min
!= 0x00)) {
110 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
111 " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
112 version_min
, version_max
);
113 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
114 ISCSI_LOGIN_STATUS_NO_VERSION
);
121 int iscsi_check_for_session_reinstatement(struct iscsi_conn
*conn
)
124 struct iscsi_param
*initiatorname_param
= NULL
, *sessiontype_param
= NULL
;
125 struct iscsi_portal_group
*tpg
= conn
->tpg
;
126 struct iscsi_session
*sess
= NULL
, *sess_p
= NULL
;
127 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
128 struct se_session
*se_sess
, *se_sess_tmp
;
130 initiatorname_param
= iscsi_find_param_from_key(
131 INITIATORNAME
, conn
->param_list
);
132 if (!initiatorname_param
)
135 sessiontype_param
= iscsi_find_param_from_key(
136 SESSIONTYPE
, conn
->param_list
);
137 if (!sessiontype_param
)
140 sessiontype
= (strncmp(sessiontype_param
->value
, NORMAL
, 6)) ? 1 : 0;
142 spin_lock_bh(&se_tpg
->session_lock
);
143 list_for_each_entry_safe(se_sess
, se_sess_tmp
, &se_tpg
->tpg_sess_list
,
146 sess_p
= (struct iscsi_session
*)se_sess
->fabric_sess_ptr
;
147 spin_lock(&sess_p
->conn_lock
);
148 if (atomic_read(&sess_p
->session_fall_back_to_erl0
) ||
149 atomic_read(&sess_p
->session_logout
) ||
150 (sess_p
->time2retain_timer_flags
& ISCSI_TF_EXPIRED
)) {
151 spin_unlock(&sess_p
->conn_lock
);
154 if (!memcmp((void *)sess_p
->isid
, (void *)conn
->sess
->isid
, 6) &&
155 (!strcmp((void *)sess_p
->sess_ops
->InitiatorName
,
156 (void *)initiatorname_param
->value
) &&
157 (sess_p
->sess_ops
->SessionType
== sessiontype
))) {
158 atomic_set(&sess_p
->session_reinstatement
, 1);
159 spin_unlock(&sess_p
->conn_lock
);
160 iscsit_inc_session_usage_count(sess_p
);
161 iscsit_stop_time2retain_timer(sess_p
);
165 spin_unlock(&sess_p
->conn_lock
);
167 spin_unlock_bh(&se_tpg
->session_lock
);
169 * If the Time2Retain handler has expired, the session is already gone.
174 pr_debug("%s iSCSI Session SID %u is still active for %s,"
175 " preforming session reinstatement.\n", (sessiontype
) ?
176 "Discovery" : "Normal", sess
->sid
,
177 sess
->sess_ops
->InitiatorName
);
179 spin_lock_bh(&sess
->conn_lock
);
180 if (sess
->session_state
== TARG_SESS_STATE_FAILED
) {
181 spin_unlock_bh(&sess
->conn_lock
);
182 iscsit_dec_session_usage_count(sess
);
183 return iscsit_close_session(sess
);
185 spin_unlock_bh(&sess
->conn_lock
);
187 iscsit_stop_session(sess
, 1, 1);
188 iscsit_dec_session_usage_count(sess
);
190 return iscsit_close_session(sess
);
193 static void iscsi_login_set_conn_values(
194 struct iscsi_session
*sess
,
195 struct iscsi_conn
*conn
,
201 * Generate a random Status sequence number (statsn) for the new
204 get_random_bytes(&conn
->stat_sn
, sizeof(u32
));
206 mutex_lock(&auth_id_lock
);
207 conn
->auth_id
= iscsit_global
->auth_id
++;
208 mutex_unlock(&auth_id_lock
);
212 * This is the leading connection of a new session,
213 * or session reinstatement.
215 static int iscsi_login_zero_tsih_s1(
216 struct iscsi_conn
*conn
,
219 struct iscsi_session
*sess
= NULL
;
220 struct iscsi_login_req
*pdu
= (struct iscsi_login_req
*)buf
;
222 sess
= kzalloc(sizeof(struct iscsi_session
), GFP_KERNEL
);
224 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
225 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
226 pr_err("Could not allocate memory for session\n");
230 iscsi_login_set_conn_values(sess
, conn
, pdu
->cid
);
231 sess
->init_task_tag
= pdu
->itt
;
232 memcpy((void *)&sess
->isid
, (void *)pdu
->isid
, 6);
233 sess
->exp_cmd_sn
= pdu
->cmdsn
;
234 INIT_LIST_HEAD(&sess
->sess_conn_list
);
235 INIT_LIST_HEAD(&sess
->sess_ooo_cmdsn_list
);
236 INIT_LIST_HEAD(&sess
->cr_active_list
);
237 INIT_LIST_HEAD(&sess
->cr_inactive_list
);
238 init_completion(&sess
->async_msg_comp
);
239 init_completion(&sess
->reinstatement_comp
);
240 init_completion(&sess
->session_wait_comp
);
241 init_completion(&sess
->session_waiting_on_uc_comp
);
242 mutex_init(&sess
->cmdsn_mutex
);
243 spin_lock_init(&sess
->conn_lock
);
244 spin_lock_init(&sess
->cr_a_lock
);
245 spin_lock_init(&sess
->cr_i_lock
);
246 spin_lock_init(&sess
->session_usage_lock
);
247 spin_lock_init(&sess
->ttt_lock
);
249 if (!idr_pre_get(&sess_idr
, GFP_KERNEL
)) {
250 pr_err("idr_pre_get() for sess_idr failed\n");
251 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
252 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
255 spin_lock(&sess_idr_lock
);
256 idr_get_new(&sess_idr
, NULL
, &sess
->session_index
);
257 spin_unlock(&sess_idr_lock
);
259 sess
->creation_time
= get_jiffies_64();
260 spin_lock_init(&sess
->session_stats_lock
);
262 * The FFP CmdSN window values will be allocated from the TPG's
263 * Initiator Node's ACL once the login has been successfully completed.
265 sess
->max_cmd_sn
= pdu
->cmdsn
;
267 sess
->sess_ops
= kzalloc(sizeof(struct iscsi_sess_ops
), GFP_KERNEL
);
268 if (!sess
->sess_ops
) {
269 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
270 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
271 pr_err("Unable to allocate memory for"
272 " struct iscsi_sess_ops.\n");
276 sess
->se_sess
= transport_init_session();
277 if (!sess
->se_sess
) {
278 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
279 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
286 static int iscsi_login_zero_tsih_s2(
287 struct iscsi_conn
*conn
)
289 struct iscsi_node_attrib
*na
;
290 struct iscsi_session
*sess
= conn
->sess
;
291 unsigned char buf
[32];
293 sess
->tpg
= conn
->tpg
;
296 * Assign a new TPG Session Handle. Note this is protected with
297 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
299 sess
->tsih
= ++ISCSI_TPG_S(sess
)->ntsih
;
301 sess
->tsih
= ++ISCSI_TPG_S(sess
)->ntsih
;
304 * Create the default params from user defined values..
306 if (iscsi_copy_param_list(&conn
->param_list
,
307 ISCSI_TPG_C(conn
)->param_list
, 1) < 0) {
308 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
309 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
313 iscsi_set_keys_to_negotiate(0, conn
->param_list
);
315 if (sess
->sess_ops
->SessionType
)
316 return iscsi_set_keys_irrelevant_for_discovery(
319 na
= iscsit_tpg_get_node_attrib(sess
);
322 * Need to send TargetPortalGroupTag back in first login response
323 * on any iSCSI connection where the Initiator provides TargetName.
324 * See 5.3.1. Login Phase Start
326 * In our case, we have already located the struct iscsi_tiqn at this point.
329 sprintf(buf
, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess
)->tpgt
);
330 if (iscsi_change_param_value(buf
, conn
->param_list
, 0) < 0) {
331 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
332 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
337 * Workaround for Initiators that have broken connection recovery logic.
339 * "We would really like to get rid of this." Linux-iSCSI.org team
342 sprintf(buf
, "ErrorRecoveryLevel=%d", na
->default_erl
);
343 if (iscsi_change_param_value(buf
, conn
->param_list
, 0) < 0) {
344 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
345 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
349 if (iscsi_login_disable_FIM_keys(conn
->param_list
, conn
) < 0)
356 * Remove PSTATE_NEGOTIATE for the four FIM related keys.
357 * The Initiator node will be able to enable FIM by proposing them itself.
359 int iscsi_login_disable_FIM_keys(
360 struct iscsi_param_list
*param_list
,
361 struct iscsi_conn
*conn
)
363 struct iscsi_param
*param
;
365 param
= iscsi_find_param_from_key("OFMarker", param_list
);
367 pr_err("iscsi_find_param_from_key() for"
368 " OFMarker failed\n");
369 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
370 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
373 param
->state
&= ~PSTATE_NEGOTIATE
;
375 param
= iscsi_find_param_from_key("OFMarkInt", param_list
);
377 pr_err("iscsi_find_param_from_key() for"
378 " IFMarker failed\n");
379 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
380 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
383 param
->state
&= ~PSTATE_NEGOTIATE
;
385 param
= iscsi_find_param_from_key("IFMarker", param_list
);
387 pr_err("iscsi_find_param_from_key() for"
388 " IFMarker failed\n");
389 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
390 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
393 param
->state
&= ~PSTATE_NEGOTIATE
;
395 param
= iscsi_find_param_from_key("IFMarkInt", param_list
);
397 pr_err("iscsi_find_param_from_key() for"
398 " IFMarker failed\n");
399 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
400 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
403 param
->state
&= ~PSTATE_NEGOTIATE
;
408 static int iscsi_login_non_zero_tsih_s1(
409 struct iscsi_conn
*conn
,
412 struct iscsi_login_req
*pdu
= (struct iscsi_login_req
*)buf
;
414 iscsi_login_set_conn_values(NULL
, conn
, pdu
->cid
);
419 * Add a new connection to an existing session.
421 static int iscsi_login_non_zero_tsih_s2(
422 struct iscsi_conn
*conn
,
425 struct iscsi_portal_group
*tpg
= conn
->tpg
;
426 struct iscsi_session
*sess
= NULL
, *sess_p
= NULL
;
427 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
428 struct se_session
*se_sess
, *se_sess_tmp
;
429 struct iscsi_login_req
*pdu
= (struct iscsi_login_req
*)buf
;
431 spin_lock_bh(&se_tpg
->session_lock
);
432 list_for_each_entry_safe(se_sess
, se_sess_tmp
, &se_tpg
->tpg_sess_list
,
435 sess_p
= (struct iscsi_session
*)se_sess
->fabric_sess_ptr
;
436 if (atomic_read(&sess_p
->session_fall_back_to_erl0
) ||
437 atomic_read(&sess_p
->session_logout
) ||
438 (sess_p
->time2retain_timer_flags
& ISCSI_TF_EXPIRED
))
440 if (!memcmp((const void *)sess_p
->isid
,
441 (const void *)pdu
->isid
, 6) &&
442 (sess_p
->tsih
== pdu
->tsih
)) {
443 iscsit_inc_session_usage_count(sess_p
);
444 iscsit_stop_time2retain_timer(sess_p
);
449 spin_unlock_bh(&se_tpg
->session_lock
);
452 * If the Time2Retain handler has expired, the session is already gone.
455 pr_err("Initiator attempting to add a connection to"
456 " a non-existent session, rejecting iSCSI Login.\n");
457 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
458 ISCSI_LOGIN_STATUS_NO_SESSION
);
463 * Stop the Time2Retain timer if this is a failed session, we restart
464 * the timer if the login is not successful.
466 spin_lock_bh(&sess
->conn_lock
);
467 if (sess
->session_state
== TARG_SESS_STATE_FAILED
)
468 atomic_set(&sess
->session_continuation
, 1);
469 spin_unlock_bh(&sess
->conn_lock
);
471 iscsi_login_set_conn_values(sess
, conn
, pdu
->cid
);
473 if (iscsi_copy_param_list(&conn
->param_list
,
474 ISCSI_TPG_C(conn
)->param_list
, 0) < 0) {
475 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
476 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
480 iscsi_set_keys_to_negotiate(0, conn
->param_list
);
482 * Need to send TargetPortalGroupTag back in first login response
483 * on any iSCSI connection where the Initiator provides TargetName.
484 * See 5.3.1. Login Phase Start
486 * In our case, we have already located the struct iscsi_tiqn at this point.
489 sprintf(buf
, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess
)->tpgt
);
490 if (iscsi_change_param_value(buf
, conn
->param_list
, 0) < 0) {
491 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
492 ISCSI_LOGIN_STATUS_NO_RESOURCES
);
496 return iscsi_login_disable_FIM_keys(conn
->param_list
, conn
);
499 int iscsi_login_post_auth_non_zero_tsih(
500 struct iscsi_conn
*conn
,
504 struct iscsi_conn
*conn_ptr
= NULL
;
505 struct iscsi_conn_recovery
*cr
= NULL
;
506 struct iscsi_session
*sess
= conn
->sess
;
509 * By following item 5 in the login table, if we have found
510 * an existing ISID and a valid/existing TSIH and an existing
511 * CID we do connection reinstatement. Currently we dont not
512 * support it so we send back an non-zero status class to the
513 * initiator and release the new connection.
515 conn_ptr
= iscsit_get_conn_from_cid_rcfr(sess
, cid
);
517 pr_err("Connection exists with CID %hu for %s,"
518 " performing connection reinstatement.\n",
519 conn_ptr
->cid
, sess
->sess_ops
->InitiatorName
);
521 iscsit_connection_reinstatement_rcfr(conn_ptr
);
522 iscsit_dec_conn_usage_count(conn_ptr
);
526 * Check for any connection recovery entires containing CID.
527 * We use the original ExpStatSN sent in the first login request
528 * to acknowledge commands for the failed connection.
530 * Also note that an explict logout may have already been sent,
531 * but the response may not be sent due to additional connection
534 if (sess
->sess_ops
->ErrorRecoveryLevel
== 2) {
535 cr
= iscsit_get_inactive_connection_recovery_entry(
538 pr_debug("Performing implicit logout"
539 " for connection recovery on CID: %hu\n",
541 iscsit_discard_cr_cmds_by_expstatsn(cr
, exp_statsn
);
546 * Else we follow item 4 from the login table in that we have
547 * found an existing ISID and a valid/existing TSIH and a new
548 * CID we go ahead and continue to add a new connection to the
551 pr_debug("Adding CID %hu to existing session for %s.\n",
552 cid
, sess
->sess_ops
->InitiatorName
);
554 if ((atomic_read(&sess
->nconn
) + 1) > sess
->sess_ops
->MaxConnections
) {
555 pr_err("Adding additional connection to this session"
556 " would exceed MaxConnections %d, login failed.\n",
557 sess
->sess_ops
->MaxConnections
);
558 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
559 ISCSI_LOGIN_STATUS_ISID_ERROR
);
566 static void iscsi_post_login_start_timers(struct iscsi_conn
*conn
)
568 struct iscsi_session
*sess
= conn
->sess
;
570 if (!sess
->sess_ops
->SessionType
)
571 iscsit_start_nopin_timer(conn
);
574 static int iscsi_post_login_handler(
576 struct iscsi_conn
*conn
,
580 struct iscsi_session
*sess
= conn
->sess
;
581 struct se_session
*se_sess
= sess
->se_sess
;
582 struct iscsi_portal_group
*tpg
= ISCSI_TPG_S(sess
);
583 struct se_portal_group
*se_tpg
= &tpg
->tpg_se_tpg
;
584 struct iscsi_thread_set
*ts
;
586 iscsit_inc_conn_usage_count(conn
);
588 iscsit_collect_login_stats(conn
, ISCSI_STATUS_CLS_SUCCESS
,
589 ISCSI_LOGIN_STATUS_ACCEPT
);
591 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
592 conn
->conn_state
= TARG_CONN_STATE_LOGGED_IN
;
594 iscsi_set_connection_parameters(conn
->conn_ops
, conn
->param_list
);
595 iscsit_set_sync_and_steering_values(conn
);
597 * SCSI Initiator -> SCSI Target Port Mapping
599 ts
= iscsi_get_thread_set();
601 iscsi_set_session_parameters(sess
->sess_ops
,
602 conn
->param_list
, 0);
603 iscsi_release_param_list(conn
->param_list
);
604 conn
->param_list
= NULL
;
606 spin_lock_bh(&sess
->conn_lock
);
607 atomic_set(&sess
->session_continuation
, 0);
608 if (sess
->session_state
== TARG_SESS_STATE_FAILED
) {
610 " TARG_SESS_STATE_LOGGED_IN.\n");
611 sess
->session_state
= TARG_SESS_STATE_LOGGED_IN
;
615 pr_debug("iSCSI Login successful on CID: %hu from %s to"
616 " %s:%hu,%hu\n", conn
->cid
, conn
->login_ip
, np
->np_ip
,
617 np
->np_port
, tpg
->tpgt
);
619 list_add_tail(&conn
->conn_list
, &sess
->sess_conn_list
);
620 atomic_inc(&sess
->nconn
);
621 pr_debug("Incremented iSCSI Connection count to %hu"
622 " from node: %s\n", atomic_read(&sess
->nconn
),
623 sess
->sess_ops
->InitiatorName
);
624 spin_unlock_bh(&sess
->conn_lock
);
626 iscsi_post_login_start_timers(conn
);
627 iscsi_activate_thread_set(conn
, ts
);
629 * Determine CPU mask to ensure connection's RX and TX kthreads
630 * are scheduled on the same CPU.
632 iscsit_thread_get_cpumask(conn
);
633 conn
->conn_rx_reset_cpumask
= 1;
634 conn
->conn_tx_reset_cpumask
= 1;
636 iscsit_dec_conn_usage_count(conn
);
638 spin_lock_bh(&se_tpg
->session_lock
);
639 iscsit_stop_time2retain_timer(sess
);
640 spin_unlock_bh(&se_tpg
->session_lock
);
642 iscsit_dec_session_usage_count(sess
);
646 iscsi_set_session_parameters(sess
->sess_ops
, conn
->param_list
, 1);
647 iscsi_release_param_list(conn
->param_list
);
648 conn
->param_list
= NULL
;
650 iscsit_determine_maxcmdsn(sess
);
652 spin_lock_bh(&se_tpg
->session_lock
);
653 __transport_register_session(&sess
->tpg
->tpg_se_tpg
,
654 se_sess
->se_node_acl
, se_sess
, (void *)sess
);
655 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
656 sess
->session_state
= TARG_SESS_STATE_LOGGED_IN
;
658 pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
659 conn
->cid
, conn
->login_ip
, np
->np_ip
, np
->np_port
, tpg
->tpgt
);
661 spin_lock_bh(&sess
->conn_lock
);
662 list_add_tail(&conn
->conn_list
, &sess
->sess_conn_list
);
663 atomic_inc(&sess
->nconn
);
664 pr_debug("Incremented iSCSI Connection count to %hu from node:"
665 " %s\n", atomic_read(&sess
->nconn
),
666 sess
->sess_ops
->InitiatorName
);
667 spin_unlock_bh(&sess
->conn_lock
);
669 sess
->sid
= tpg
->sid
++;
671 sess
->sid
= tpg
->sid
++;
672 pr_debug("Established iSCSI session from node: %s\n",
673 sess
->sess_ops
->InitiatorName
);
677 tpg
->tpg_tiqn
->tiqn_nsessions
++;
679 pr_debug("Incremented number of active iSCSI sessions to %u on"
680 " iSCSI Target Portal Group: %hu\n", tpg
->nsessions
, tpg
->tpgt
);
681 spin_unlock_bh(&se_tpg
->session_lock
);
683 iscsi_post_login_start_timers(conn
);
684 iscsi_activate_thread_set(conn
, ts
);
686 * Determine CPU mask to ensure connection's RX and TX kthreads
687 * are scheduled on the same CPU.
689 iscsit_thread_get_cpumask(conn
);
690 conn
->conn_rx_reset_cpumask
= 1;
691 conn
->conn_tx_reset_cpumask
= 1;
693 iscsit_dec_conn_usage_count(conn
);
698 static void iscsi_handle_login_thread_timeout(unsigned long data
)
700 struct iscsi_np
*np
= (struct iscsi_np
*) data
;
702 spin_lock_bh(&np
->np_thread_lock
);
703 pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
704 np
->np_ip
, np
->np_port
);
706 if (np
->np_login_timer_flags
& ISCSI_TF_STOP
) {
707 spin_unlock_bh(&np
->np_thread_lock
);
712 send_sig(SIGINT
, np
->np_thread
, 1);
714 np
->np_login_timer_flags
&= ~ISCSI_TF_RUNNING
;
715 spin_unlock_bh(&np
->np_thread_lock
);
718 static void iscsi_start_login_thread_timer(struct iscsi_np
*np
)
721 * This used the TA_LOGIN_TIMEOUT constant because at this
722 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
724 spin_lock_bh(&np
->np_thread_lock
);
725 init_timer(&np
->np_login_timer
);
726 np
->np_login_timer
.expires
= (get_jiffies_64() + TA_LOGIN_TIMEOUT
* HZ
);
727 np
->np_login_timer
.data
= (unsigned long)np
;
728 np
->np_login_timer
.function
= iscsi_handle_login_thread_timeout
;
729 np
->np_login_timer_flags
&= ~ISCSI_TF_STOP
;
730 np
->np_login_timer_flags
|= ISCSI_TF_RUNNING
;
731 add_timer(&np
->np_login_timer
);
733 pr_debug("Added timeout timer to iSCSI login request for"
734 " %u seconds.\n", TA_LOGIN_TIMEOUT
);
735 spin_unlock_bh(&np
->np_thread_lock
);
738 static void iscsi_stop_login_thread_timer(struct iscsi_np
*np
)
740 spin_lock_bh(&np
->np_thread_lock
);
741 if (!(np
->np_login_timer_flags
& ISCSI_TF_RUNNING
)) {
742 spin_unlock_bh(&np
->np_thread_lock
);
745 np
->np_login_timer_flags
|= ISCSI_TF_STOP
;
746 spin_unlock_bh(&np
->np_thread_lock
);
748 del_timer_sync(&np
->np_login_timer
);
750 spin_lock_bh(&np
->np_thread_lock
);
751 np
->np_login_timer_flags
&= ~ISCSI_TF_RUNNING
;
752 spin_unlock_bh(&np
->np_thread_lock
);
755 int iscsi_target_setup_login_socket(
757 struct __kernel_sockaddr_storage
*sockaddr
)
760 int backlog
= 5, ret
, opt
= 0, len
;
762 switch (np
->np_network_transport
) {
764 np
->np_ip_proto
= IPPROTO_TCP
;
765 np
->np_sock_type
= SOCK_STREAM
;
768 np
->np_ip_proto
= IPPROTO_SCTP
;
769 np
->np_sock_type
= SOCK_STREAM
;
772 np
->np_ip_proto
= IPPROTO_SCTP
;
773 np
->np_sock_type
= SOCK_SEQPACKET
;
775 case ISCSI_IWARP_TCP
:
776 case ISCSI_IWARP_SCTP
:
777 case ISCSI_INFINIBAND
:
779 pr_err("Unsupported network_transport: %d\n",
780 np
->np_network_transport
);
784 ret
= sock_create(sockaddr
->ss_family
, np
->np_sock_type
,
785 np
->np_ip_proto
, &sock
);
787 pr_err("sock_create() failed.\n");
790 np
->np_socket
= sock
;
792 * The SCTP stack needs struct socket->file.
794 if ((np
->np_network_transport
== ISCSI_SCTP_TCP
) ||
795 (np
->np_network_transport
== ISCSI_SCTP_UDP
)) {
797 sock
->file
= kzalloc(sizeof(struct file
), GFP_KERNEL
);
799 pr_err("Unable to allocate struct"
804 np
->np_flags
|= NPF_SCTP_STRUCT_FILE
;
808 * Setup the np->np_sockaddr from the passed sockaddr setup
809 * in iscsi_target_configfs.c code..
811 memcpy((void *)&np
->np_sockaddr
, (void *)sockaddr
,
812 sizeof(struct __kernel_sockaddr_storage
));
814 if (sockaddr
->ss_family
== AF_INET6
)
815 len
= sizeof(struct sockaddr_in6
);
817 len
= sizeof(struct sockaddr_in
);
819 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
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 ret
= kernel_setsockopt(sock
, SOL_SOCKET
, SO_REUSEADDR
,
833 (char *)&opt
, sizeof(opt
));
835 pr_err("kernel_setsockopt() for SO_REUSEADDR"
840 ret
= kernel_bind(sock
, (struct sockaddr
*)&np
->np_sockaddr
, len
);
842 pr_err("kernel_bind() failed: %d\n", ret
);
846 ret
= kernel_listen(sock
, backlog
);
848 pr_err("kernel_listen() failed: %d\n", ret
);
855 np
->np_socket
= NULL
;
857 if (np
->np_flags
& NPF_SCTP_STRUCT_FILE
) {
867 static int __iscsi_target_login_thread(struct iscsi_np
*np
)
869 u8 buffer
[ISCSI_HDR_LEN
], iscsi_opcode
, zero_tsih
= 0;
870 int err
, ret
= 0, ip_proto
, sock_type
, set_sctp_conn_flag
, stop
;
871 struct iscsi_conn
*conn
= NULL
;
872 struct iscsi_login
*login
;
873 struct iscsi_portal_group
*tpg
= NULL
;
874 struct socket
*new_sock
, *sock
;
876 struct iscsi_login_req
*pdu
;
877 struct sockaddr_in sock_in
;
878 struct sockaddr_in6 sock_in6
;
880 flush_signals(current
);
881 set_sctp_conn_flag
= 0;
882 sock
= np
->np_socket
;
883 ip_proto
= np
->np_ip_proto
;
884 sock_type
= np
->np_sock_type
;
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
);
907 * The SCTP stack needs struct socket->file.
909 if ((np
->np_network_transport
== ISCSI_SCTP_TCP
) ||
910 (np
->np_network_transport
== ISCSI_SCTP_UDP
)) {
911 if (!new_sock
->file
) {
912 new_sock
->file
= kzalloc(
913 sizeof(struct file
), GFP_KERNEL
);
914 if (!new_sock
->file
) {
915 pr_err("Unable to allocate struct"
917 sock_release(new_sock
);
918 /* Get another socket */
921 set_sctp_conn_flag
= 1;
925 iscsi_start_login_thread_timer(np
);
927 conn
= kzalloc(sizeof(struct iscsi_conn
), GFP_KERNEL
);
929 pr_err("Could not allocate memory for"
930 " new connection\n");
931 if (set_sctp_conn_flag
) {
932 kfree(new_sock
->file
);
933 new_sock
->file
= NULL
;
935 sock_release(new_sock
);
936 /* Get another socket */
940 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
941 conn
->conn_state
= TARG_CONN_STATE_FREE
;
942 conn
->sock
= new_sock
;
944 if (set_sctp_conn_flag
)
945 conn
->conn_flags
|= CONNFLAG_SCTP_STRUCT_FILE
;
947 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
948 conn
->conn_state
= TARG_CONN_STATE_XPT_UP
;
951 * Allocate conn->conn_ops early as a failure calling
952 * iscsit_tx_login_rsp() below will call tx_data().
954 conn
->conn_ops
= kzalloc(sizeof(struct iscsi_conn_ops
), GFP_KERNEL
);
955 if (!conn
->conn_ops
) {
956 pr_err("Unable to allocate memory for"
957 " struct iscsi_conn_ops.\n");
961 * Perform the remaining iSCSI connection initialization items..
963 if (iscsi_login_init_conn(conn
) < 0)
966 memset(buffer
, 0, ISCSI_HDR_LEN
);
967 memset(&iov
, 0, sizeof(struct kvec
));
968 iov
.iov_base
= buffer
;
969 iov
.iov_len
= ISCSI_HDR_LEN
;
971 if (rx_data(conn
, &iov
, 1, ISCSI_HDR_LEN
) <= 0) {
972 pr_err("rx_data() returned an error.\n");
976 iscsi_opcode
= (buffer
[0] & ISCSI_OPCODE_MASK
);
977 if (!(iscsi_opcode
& ISCSI_OP_LOGIN
)) {
978 pr_err("First opcode is not login request,"
979 " failing login request.\n");
983 pdu
= (struct iscsi_login_req
*) buffer
;
984 pdu
->cid
= be16_to_cpu(pdu
->cid
);
985 pdu
->tsih
= be16_to_cpu(pdu
->tsih
);
986 pdu
->itt
= be32_to_cpu(pdu
->itt
);
987 pdu
->cmdsn
= be32_to_cpu(pdu
->cmdsn
);
988 pdu
->exp_statsn
= be32_to_cpu(pdu
->exp_statsn
);
990 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
991 * when Status-Class != 0.
993 conn
->login_itt
= pdu
->itt
;
995 spin_lock_bh(&np
->np_thread_lock
);
996 if (np
->np_thread_state
!= ISCSI_NP_THREAD_ACTIVE
) {
997 spin_unlock_bh(&np
->np_thread_lock
);
998 pr_err("iSCSI Network Portal on %s:%hu currently not"
999 " active.\n", np
->np_ip
, np
->np_port
);
1000 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
1001 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE
);
1004 spin_unlock_bh(&np
->np_thread_lock
);
1006 if (np
->np_sockaddr
.ss_family
== AF_INET6
) {
1007 memset(&sock_in6
, 0, sizeof(struct sockaddr_in6
));
1009 if (conn
->sock
->ops
->getname(conn
->sock
,
1010 (struct sockaddr
*)&sock_in6
, &err
, 1) < 0) {
1011 pr_err("sock_ops->getname() failed.\n");
1012 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
1013 ISCSI_LOGIN_STATUS_TARGET_ERROR
);
1016 snprintf(conn
->login_ip
, sizeof(conn
->login_ip
), "%pI6c",
1017 &sock_in6
.sin6_addr
.in6_u
);
1018 conn
->login_port
= ntohs(sock_in6
.sin6_port
);
1020 memset(&sock_in
, 0, sizeof(struct sockaddr_in
));
1022 if (conn
->sock
->ops
->getname(conn
->sock
,
1023 (struct sockaddr
*)&sock_in
, &err
, 1) < 0) {
1024 pr_err("sock_ops->getname() failed.\n");
1025 iscsit_tx_login_rsp(conn
, ISCSI_STATUS_CLS_TARGET_ERR
,
1026 ISCSI_LOGIN_STATUS_TARGET_ERROR
);
1029 sprintf(conn
->login_ip
, "%pI4", &sock_in
.sin_addr
.s_addr
);
1030 conn
->login_port
= ntohs(sock_in
.sin_port
);
1033 conn
->network_transport
= np
->np_network_transport
;
1035 pr_debug("Received iSCSI login request from %s on %s Network"
1036 " Portal %s:%hu\n", conn
->login_ip
,
1037 (conn
->network_transport
== ISCSI_TCP
) ? "TCP" : "SCTP",
1038 np
->np_ip
, np
->np_port
);
1040 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1041 conn
->conn_state
= TARG_CONN_STATE_IN_LOGIN
;
1043 if (iscsi_login_check_initiator_version(conn
, pdu
->max_version
,
1044 pdu
->min_version
) < 0)
1047 zero_tsih
= (pdu
->tsih
== 0x0000);
1050 * This is the leading connection of a new session.
1051 * We wait until after authentication to check for
1052 * session reinstatement.
1054 if (iscsi_login_zero_tsih_s1(conn
, buffer
) < 0)
1058 * Add a new connection to an existing session.
1059 * We check for a non-existant session in
1060 * iscsi_login_non_zero_tsih_s2() below based
1061 * on ISID/TSIH, but wait until after authentication
1062 * to check for connection reinstatement, etc.
1064 if (iscsi_login_non_zero_tsih_s1(conn
, buffer
) < 0)
1069 * This will process the first login request, and call
1070 * iscsi_target_locate_portal(), and return a valid struct iscsi_login.
1072 login
= iscsi_target_init_negotiation(np
, conn
, buffer
);
1080 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1085 if (iscsi_login_zero_tsih_s2(conn
) < 0) {
1086 iscsi_target_nego_release(login
, conn
);
1090 if (iscsi_login_non_zero_tsih_s2(conn
, buffer
) < 0) {
1091 iscsi_target_nego_release(login
, conn
);
1096 if (iscsi_target_start_negotiation(login
, conn
) < 0)
1100 pr_err("struct iscsi_conn session pointer is NULL!\n");
1104 iscsi_stop_login_thread_timer(np
);
1106 if (signal_pending(current
))
1109 ret
= iscsi_post_login_handler(np
, conn
, zero_tsih
);
1114 iscsit_deaccess_np(np
, tpg
);
1116 /* Get another socket */
1120 pr_err("iSCSI Login negotiation failed.\n");
1121 iscsit_collect_login_stats(conn
, ISCSI_STATUS_CLS_INITIATOR_ERR
,
1122 ISCSI_LOGIN_STATUS_INIT_ERR
);
1123 if (!zero_tsih
|| !conn
->sess
)
1125 if (conn
->sess
->se_sess
)
1126 transport_free_session(conn
->sess
->se_sess
);
1127 if (conn
->sess
->session_index
!= 0) {
1128 spin_lock_bh(&sess_idr_lock
);
1129 idr_remove(&sess_idr
, conn
->sess
->session_index
);
1130 spin_unlock_bh(&sess_idr_lock
);
1132 if (conn
->sess
->sess_ops
)
1133 kfree(conn
->sess
->sess_ops
);
1137 iscsi_stop_login_thread_timer(np
);
1139 * If login negotiation fails check if the Time2Retain timer
1140 * needs to be restarted.
1142 if (!zero_tsih
&& conn
->sess
) {
1143 spin_lock_bh(&conn
->sess
->conn_lock
);
1144 if (conn
->sess
->session_state
== TARG_SESS_STATE_FAILED
) {
1145 struct se_portal_group
*se_tpg
=
1146 &ISCSI_TPG_C(conn
)->tpg_se_tpg
;
1148 atomic_set(&conn
->sess
->session_continuation
, 0);
1149 spin_unlock_bh(&conn
->sess
->conn_lock
);
1150 spin_lock_bh(&se_tpg
->session_lock
);
1151 iscsit_start_time2retain_handler(conn
->sess
);
1152 spin_unlock_bh(&se_tpg
->session_lock
);
1154 spin_unlock_bh(&conn
->sess
->conn_lock
);
1155 iscsit_dec_session_usage_count(conn
->sess
);
1158 if (!IS_ERR(conn
->conn_rx_hash
.tfm
))
1159 crypto_free_hash(conn
->conn_rx_hash
.tfm
);
1160 if (!IS_ERR(conn
->conn_tx_hash
.tfm
))
1161 crypto_free_hash(conn
->conn_tx_hash
.tfm
);
1163 if (conn
->conn_cpumask
)
1164 free_cpumask_var(conn
->conn_cpumask
);
1166 kfree(conn
->conn_ops
);
1168 if (conn
->param_list
) {
1169 iscsi_release_param_list(conn
->param_list
);
1170 conn
->param_list
= NULL
;
1173 if (conn
->conn_flags
& CONNFLAG_SCTP_STRUCT_FILE
) {
1174 kfree(conn
->sock
->file
);
1175 conn
->sock
->file
= NULL
;
1177 sock_release(conn
->sock
);
1182 iscsit_deaccess_np(np
, tpg
);
1187 stop
= kthread_should_stop();
1188 if (!stop
&& signal_pending(current
)) {
1189 spin_lock_bh(&np
->np_thread_lock
);
1190 stop
= (np
->np_thread_state
== ISCSI_NP_THREAD_SHUTDOWN
);
1191 spin_unlock_bh(&np
->np_thread_lock
);
1193 /* Wait for another socket.. */
1197 iscsi_stop_login_thread_timer(np
);
1198 spin_lock_bh(&np
->np_thread_lock
);
1199 np
->np_thread_state
= ISCSI_NP_THREAD_EXIT
;
1200 spin_unlock_bh(&np
->np_thread_lock
);
1204 int iscsi_target_login_thread(void *arg
)
1206 struct iscsi_np
*np
= (struct iscsi_np
*)arg
;
1209 allow_signal(SIGINT
);
1211 while (!kthread_should_stop()) {
1212 ret
= __iscsi_target_login_thread(np
);
1214 * We break and exit here unless another sock_accept() call