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target: header reshuffle, part2
[mirror_ubuntu-zesty-kernel.git] / drivers / target / iscsi / iscsi_target_login.c
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e48354ce
NB		 1/*******************************************************************************
2 * This file contains the login functions used by the iSCSI Target driver.
3 *
4 * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
5 *
6 * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
7 *
8 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
9 *
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.
14 *
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 ******************************************************************************/
20
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>
c4795fb2 26#include <target/target_core_fabric.h>
e48354ce
NB		 27
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"
40
41extern struct idr sess_idr;
42extern struct mutex auth_id_lock;
43extern spinlock_t sess_idr_lock;
44
45static int iscsi_login_init_conn(struct iscsi_conn *conn)
46{
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);
64
65 if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
66 pr_err("Unable to allocate conn->conn_cpumask\n");
67 return -ENOMEM;
68 }
69
70 return 0;
71}
72
73/*
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
76 */
77int iscsi_login_setup_crypto(struct iscsi_conn *conn)
78{
79 /*
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
83 */
84 conn->conn_rx_hash.flags = 0;
85 conn->conn_rx_hash.tfm = crypto_alloc_hash("crc32c", 0,
86 CRYPTO_ALG_ASYNC);
87 if (IS_ERR(conn->conn_rx_hash.tfm)) {
88 pr_err("crypto_alloc_hash() failed for conn_rx_tfm\n");
89 return -ENOMEM;
90 }
91
92 conn->conn_tx_hash.flags = 0;
93 conn->conn_tx_hash.tfm = crypto_alloc_hash("crc32c", 0,
94 CRYPTO_ALG_ASYNC);
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);
98 return -ENOMEM;
99 }
100
101 return 0;
102}
103
104static int iscsi_login_check_initiator_version(
105 struct iscsi_conn *conn,
106 u8 version_max,
107 u8 version_min)
108{
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);
115 return -1;
116 }
117
118 return 0;
119}
120
121int iscsi_check_for_session_reinstatement(struct iscsi_conn *conn)
122{
123 int sessiontype;
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;
129
130 initiatorname_param = iscsi_find_param_from_key(
131 INITIATORNAME, conn->param_list);
132 if (!initiatorname_param)
133 return -1;
134
135 sessiontype_param = iscsi_find_param_from_key(
136 SESSIONTYPE, conn->param_list);
137 if (!sessiontype_param)
138 return -1;
139
140 sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
141
142 spin_lock_bh(&se_tpg->session_lock);
143 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
144 sess_list) {
145
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);
152 continue;
153 }
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);
162 sess = sess_p;
163 break;
164 }
165 spin_unlock(&sess_p->conn_lock);
166 }
167 spin_unlock_bh(&se_tpg->session_lock);
168 /*
169 * If the Time2Retain handler has expired, the session is already gone.
170 */
171 if (!sess)
172 return 0;
173
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);
178
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);
184 }
185 spin_unlock_bh(&sess->conn_lock);
186
187 iscsit_stop_session(sess, 1, 1);
188 iscsit_dec_session_usage_count(sess);
189
190 return iscsit_close_session(sess);
191}
192
193static void iscsi_login_set_conn_values(
194 struct iscsi_session *sess,
195 struct iscsi_conn *conn,
196 u16 cid)
197{
198 conn->sess = sess;
199 conn->cid = cid;
200 /*
201 * Generate a random Status sequence number (statsn) for the new
202 * iSCSI connection.
203 */
204 get_random_bytes(&conn->stat_sn, sizeof(u32));
205
206 mutex_lock(&auth_id_lock);
207 conn->auth_id = iscsit_global->auth_id++;
208 mutex_unlock(&auth_id_lock);
209}
210
211/*
212 * This is the leading connection of a new session,
213 * or session reinstatement.
214 */
215static int iscsi_login_zero_tsih_s1(
216 struct iscsi_conn *conn,
217 unsigned char *buf)
218{
219 struct iscsi_session *sess = NULL;
220 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
221
222 sess = kzalloc(sizeof(struct iscsi_session), GFP_KERNEL);
223 if (!sess) {
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");
0957627a 227 return -ENOMEM;
e48354ce
NB		 228 }
229
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);
248
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);
0957627a
NB		 253 kfree(sess);
254 return -ENOMEM;
e48354ce
NB		 255 }
256 spin_lock(&sess_idr_lock);
257 idr_get_new(&sess_idr, NULL, &sess->session_index);
258 spin_unlock(&sess_idr_lock);
259
260 sess->creation_time = get_jiffies_64();
261 spin_lock_init(&sess->session_stats_lock);
262 /*
263 * The FFP CmdSN window values will be allocated from the TPG's
264 * Initiator Node's ACL once the login has been successfully completed.
265 */
266 sess->max_cmd_sn = pdu->cmdsn;
267
268 sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
269 if (!sess->sess_ops) {
270 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
271 ISCSI_LOGIN_STATUS_NO_RESOURCES);
272 pr_err("Unable to allocate memory for"
273 " struct iscsi_sess_ops.\n");
0957627a
NB		 274 kfree(sess);
275 return -ENOMEM;
e48354ce
NB		 276 }
277
278 sess->se_sess = transport_init_session();
0957627a 279 if (IS_ERR(sess->se_sess)) {
e48354ce
NB		 280 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
281 ISCSI_LOGIN_STATUS_NO_RESOURCES);
0957627a
NB		 282 kfree(sess);
283 return -ENOMEM;
e48354ce
NB		 284 }
285
286 return 0;
287}
288
289static int iscsi_login_zero_tsih_s2(
290 struct iscsi_conn *conn)
291{
292 struct iscsi_node_attrib *na;
293 struct iscsi_session *sess = conn->sess;
294 unsigned char buf[32];
295
296 sess->tpg = conn->tpg;
297
298 /*
299 * Assign a new TPG Session Handle. Note this is protected with
300 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
301 */
302 sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
303 if (!sess->tsih)
304 sess->tsih = ++ISCSI_TPG_S(sess)->ntsih;
305
306 /*
307 * Create the default params from user defined values..
308 */
309 if (iscsi_copy_param_list(&conn->param_list,
310 ISCSI_TPG_C(conn)->param_list, 1) < 0) {
311 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
312 ISCSI_LOGIN_STATUS_NO_RESOURCES);
313 return -1;
314 }
315
316 iscsi_set_keys_to_negotiate(0, conn->param_list);
317
318 if (sess->sess_ops->SessionType)
319 return iscsi_set_keys_irrelevant_for_discovery(
320 conn->param_list);
321
322 na = iscsit_tpg_get_node_attrib(sess);
323
324 /*
325 * Need to send TargetPortalGroupTag back in first login response
326 * on any iSCSI connection where the Initiator provides TargetName.
327 * See 5.3.1. Login Phase Start
328 *
329 * In our case, we have already located the struct iscsi_tiqn at this point.
330 */
331 memset(buf, 0, 32);
332 sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
333 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
334 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
335 ISCSI_LOGIN_STATUS_NO_RESOURCES);
336 return -1;
337 }
338
339 /*
340 * Workaround for Initiators that have broken connection recovery logic.
341 *
342 * "We would really like to get rid of this." Linux-iSCSI.org team
343 */
344 memset(buf, 0, 32);
345 sprintf(buf, "ErrorRecoveryLevel=%d", na->default_erl);
346 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
347 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
348 ISCSI_LOGIN_STATUS_NO_RESOURCES);
349 return -1;
350 }
351
352 if (iscsi_login_disable_FIM_keys(conn->param_list, conn) < 0)
353 return -1;
354
355 return 0;
356}
357
358/*
359 * Remove PSTATE_NEGOTIATE for the four FIM related keys.
360 * The Initiator node will be able to enable FIM by proposing them itself.
361 */
362int iscsi_login_disable_FIM_keys(
363 struct iscsi_param_list *param_list,
364 struct iscsi_conn *conn)
365{
366 struct iscsi_param *param;
367
368 param = iscsi_find_param_from_key("OFMarker", param_list);
369 if (!param) {
370 pr_err("iscsi_find_param_from_key() for"
371 " OFMarker failed\n");
372 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
373 ISCSI_LOGIN_STATUS_NO_RESOURCES);
374 return -1;
375 }
376 param->state &= ~PSTATE_NEGOTIATE;
377
378 param = iscsi_find_param_from_key("OFMarkInt", param_list);
379 if (!param) {
380 pr_err("iscsi_find_param_from_key() for"
381 " IFMarker failed\n");
382 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
383 ISCSI_LOGIN_STATUS_NO_RESOURCES);
384 return -1;
385 }
386 param->state &= ~PSTATE_NEGOTIATE;
387
388 param = iscsi_find_param_from_key("IFMarker", param_list);
389 if (!param) {
390 pr_err("iscsi_find_param_from_key() for"
391 " IFMarker failed\n");
392 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
393 ISCSI_LOGIN_STATUS_NO_RESOURCES);
394 return -1;
395 }
396 param->state &= ~PSTATE_NEGOTIATE;
397
398 param = iscsi_find_param_from_key("IFMarkInt", param_list);
399 if (!param) {
400 pr_err("iscsi_find_param_from_key() for"
401 " IFMarker failed\n");
402 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
403 ISCSI_LOGIN_STATUS_NO_RESOURCES);
404 return -1;
405 }
406 param->state &= ~PSTATE_NEGOTIATE;
407
408 return 0;
409}
410
411static int iscsi_login_non_zero_tsih_s1(
412 struct iscsi_conn *conn,
413 unsigned char *buf)
414{
415 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
416
417 iscsi_login_set_conn_values(NULL, conn, pdu->cid);
418 return 0;
419}
420
421/*
422 * Add a new connection to an existing session.
423 */
424static int iscsi_login_non_zero_tsih_s2(
425 struct iscsi_conn *conn,
426 unsigned char *buf)
427{
428 struct iscsi_portal_group *tpg = conn->tpg;
429 struct iscsi_session *sess = NULL, *sess_p = NULL;
430 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
431 struct se_session *se_sess, *se_sess_tmp;
432 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
433
434 spin_lock_bh(&se_tpg->session_lock);
435 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
436 sess_list) {
437
438 sess_p = (struct iscsi_session *)se_sess->fabric_sess_ptr;
439 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
440 atomic_read(&sess_p->session_logout) ||
441 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
442 continue;
443 if (!memcmp((const void *)sess_p->isid,
444 (const void *)pdu->isid, 6) &&
445 (sess_p->tsih == pdu->tsih)) {
446 iscsit_inc_session_usage_count(sess_p);
447 iscsit_stop_time2retain_timer(sess_p);
448 sess = sess_p;
449 break;
450 }
451 }
452 spin_unlock_bh(&se_tpg->session_lock);
453
454 /*
455 * If the Time2Retain handler has expired, the session is already gone.
456 */
457 if (!sess) {
458 pr_err("Initiator attempting to add a connection to"
459 " a non-existent session, rejecting iSCSI Login.\n");
460 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
461 ISCSI_LOGIN_STATUS_NO_SESSION);
462 return -1;
463 }
464
465 /*
466 * Stop the Time2Retain timer if this is a failed session, we restart
467 * the timer if the login is not successful.
468 */
469 spin_lock_bh(&sess->conn_lock);
470 if (sess->session_state == TARG_SESS_STATE_FAILED)
471 atomic_set(&sess->session_continuation, 1);
472 spin_unlock_bh(&sess->conn_lock);
473
474 iscsi_login_set_conn_values(sess, conn, pdu->cid);
475
476 if (iscsi_copy_param_list(&conn->param_list,
477 ISCSI_TPG_C(conn)->param_list, 0) < 0) {
478 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
479 ISCSI_LOGIN_STATUS_NO_RESOURCES);
480 return -1;
481 }
482
483 iscsi_set_keys_to_negotiate(0, conn->param_list);
484 /*
485 * Need to send TargetPortalGroupTag back in first login response
486 * on any iSCSI connection where the Initiator provides TargetName.
487 * See 5.3.1. Login Phase Start
488 *
489 * In our case, we have already located the struct iscsi_tiqn at this point.
490 */
491 memset(buf, 0, 32);
492 sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
493 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
494 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
495 ISCSI_LOGIN_STATUS_NO_RESOURCES);
496 return -1;
497 }
498
499 return iscsi_login_disable_FIM_keys(conn->param_list, conn);
500}
501
502int iscsi_login_post_auth_non_zero_tsih(
503 struct iscsi_conn *conn,
504 u16 cid,
505 u32 exp_statsn)
506{
507 struct iscsi_conn *conn_ptr = NULL;
508 struct iscsi_conn_recovery *cr = NULL;
509 struct iscsi_session *sess = conn->sess;
510
511 /*
512 * By following item 5 in the login table, if we have found
513 * an existing ISID and a valid/existing TSIH and an existing
514 * CID we do connection reinstatement. Currently we dont not
515 * support it so we send back an non-zero status class to the
516 * initiator and release the new connection.
517 */
518 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
519 if ((conn_ptr)) {
520 pr_err("Connection exists with CID %hu for %s,"
521 " performing connection reinstatement.\n",
522 conn_ptr->cid, sess->sess_ops->InitiatorName);
523
524 iscsit_connection_reinstatement_rcfr(conn_ptr);
525 iscsit_dec_conn_usage_count(conn_ptr);
526 }
527
528 /*
529 * Check for any connection recovery entires containing CID.
530 * We use the original ExpStatSN sent in the first login request
531 * to acknowledge commands for the failed connection.
532 *
533 * Also note that an explict logout may have already been sent,
534 * but the response may not be sent due to additional connection
535 * loss.
536 */
537 if (sess->sess_ops->ErrorRecoveryLevel == 2) {
538 cr = iscsit_get_inactive_connection_recovery_entry(
539 sess, cid);
540 if ((cr)) {
541 pr_debug("Performing implicit logout"
542 " for connection recovery on CID: %hu\n",
543 conn->cid);
544 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
545 }
546 }
547
548 /*
549 * Else we follow item 4 from the login table in that we have
550 * found an existing ISID and a valid/existing TSIH and a new
551 * CID we go ahead and continue to add a new connection to the
552 * session.
553 */
554 pr_debug("Adding CID %hu to existing session for %s.\n",
555 cid, sess->sess_ops->InitiatorName);
556
557 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
558 pr_err("Adding additional connection to this session"
559 " would exceed MaxConnections %d, login failed.\n",
560 sess->sess_ops->MaxConnections);
561 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
562 ISCSI_LOGIN_STATUS_ISID_ERROR);
563 return -1;
564 }
565
566 return 0;
567}
568
569static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
570{
571 struct iscsi_session *sess = conn->sess;
572
573 if (!sess->sess_ops->SessionType)
574 iscsit_start_nopin_timer(conn);
575}
576
577static int iscsi_post_login_handler(
578 struct iscsi_np *np,
579 struct iscsi_conn *conn,
580 u8 zero_tsih)
581{
582 int stop_timer = 0;
583 struct iscsi_session *sess = conn->sess;
584 struct se_session *se_sess = sess->se_sess;
585 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
586 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
587 struct iscsi_thread_set *ts;
588
589 iscsit_inc_conn_usage_count(conn);
590
591 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
592 ISCSI_LOGIN_STATUS_ACCEPT);
593
594 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
595 conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
596
597 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
598 iscsit_set_sync_and_steering_values(conn);
599 /*
600 * SCSI Initiator -> SCSI Target Port Mapping
601 */
602 ts = iscsi_get_thread_set();
603 if (!zero_tsih) {
604 iscsi_set_session_parameters(sess->sess_ops,
605 conn->param_list, 0);
606 iscsi_release_param_list(conn->param_list);
607 conn->param_list = NULL;
608
609 spin_lock_bh(&sess->conn_lock);
610 atomic_set(&sess->session_continuation, 0);
611 if (sess->session_state == TARG_SESS_STATE_FAILED) {
612 pr_debug("Moving to"
613 " TARG_SESS_STATE_LOGGED_IN.\n");
614 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
615 stop_timer = 1;
616 }
617
618 pr_debug("iSCSI Login successful on CID: %hu from %s to"
619 " %s:%hu,%hu\n", conn->cid, conn->login_ip, np->np_ip,
620 np->np_port, tpg->tpgt);
621
622 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
623 atomic_inc(&sess->nconn);
624 pr_debug("Incremented iSCSI Connection count to %hu"
625 " from node: %s\n", atomic_read(&sess->nconn),
626 sess->sess_ops->InitiatorName);
627 spin_unlock_bh(&sess->conn_lock);
628
629 iscsi_post_login_start_timers(conn);
630 iscsi_activate_thread_set(conn, ts);
631 /*
632 * Determine CPU mask to ensure connection's RX and TX kthreads
633 * are scheduled on the same CPU.
634 */
635 iscsit_thread_get_cpumask(conn);
636 conn->conn_rx_reset_cpumask = 1;
637 conn->conn_tx_reset_cpumask = 1;
638
639 iscsit_dec_conn_usage_count(conn);
640 if (stop_timer) {
641 spin_lock_bh(&se_tpg->session_lock);
642 iscsit_stop_time2retain_timer(sess);
643 spin_unlock_bh(&se_tpg->session_lock);
644 }
645 iscsit_dec_session_usage_count(sess);
646 return 0;
647 }
648
649 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
650 iscsi_release_param_list(conn->param_list);
651 conn->param_list = NULL;
652
653 iscsit_determine_maxcmdsn(sess);
654
655 spin_lock_bh(&se_tpg->session_lock);
656 __transport_register_session(&sess->tpg->tpg_se_tpg,
657 se_sess->se_node_acl, se_sess, (void *)sess);
658 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
659 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
660
661 pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
662 conn->cid, conn->login_ip, np->np_ip, np->np_port, tpg->tpgt);
663
664 spin_lock_bh(&sess->conn_lock);
665 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
666 atomic_inc(&sess->nconn);
667 pr_debug("Incremented iSCSI Connection count to %hu from node:"
668 " %s\n", atomic_read(&sess->nconn),
669 sess->sess_ops->InitiatorName);
670 spin_unlock_bh(&sess->conn_lock);
671
672 sess->sid = tpg->sid++;
673 if (!sess->sid)
674 sess->sid = tpg->sid++;
675 pr_debug("Established iSCSI session from node: %s\n",
676 sess->sess_ops->InitiatorName);
677
678 tpg->nsessions++;
679 if (tpg->tpg_tiqn)
680 tpg->tpg_tiqn->tiqn_nsessions++;
681
682 pr_debug("Incremented number of active iSCSI sessions to %u on"
683 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
684 spin_unlock_bh(&se_tpg->session_lock);
685
686 iscsi_post_login_start_timers(conn);
687 iscsi_activate_thread_set(conn, ts);
688 /*
689 * Determine CPU mask to ensure connection's RX and TX kthreads
690 * are scheduled on the same CPU.
691 */
692 iscsit_thread_get_cpumask(conn);
693 conn->conn_rx_reset_cpumask = 1;
694 conn->conn_tx_reset_cpumask = 1;
695
696 iscsit_dec_conn_usage_count(conn);
697
698 return 0;
699}
700
701static void iscsi_handle_login_thread_timeout(unsigned long data)
702{
703 struct iscsi_np *np = (struct iscsi_np *) data;
704
705 spin_lock_bh(&np->np_thread_lock);
706 pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
707 np->np_ip, np->np_port);
708
709 if (np->np_login_timer_flags & ISCSI_TF_STOP) {
710 spin_unlock_bh(&np->np_thread_lock);
711 return;
712 }
713
714 if (np->np_thread)
715 send_sig(SIGINT, np->np_thread, 1);
716
717 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
718 spin_unlock_bh(&np->np_thread_lock);
719}
720
721static void iscsi_start_login_thread_timer(struct iscsi_np *np)
722{
723 /*
724 * This used the TA_LOGIN_TIMEOUT constant because at this
725 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
726 */
727 spin_lock_bh(&np->np_thread_lock);
728 init_timer(&np->np_login_timer);
729 np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
730 np->np_login_timer.data = (unsigned long)np;
731 np->np_login_timer.function = iscsi_handle_login_thread_timeout;
732 np->np_login_timer_flags &= ~ISCSI_TF_STOP;
733 np->np_login_timer_flags |= ISCSI_TF_RUNNING;
734 add_timer(&np->np_login_timer);
735
736 pr_debug("Added timeout timer to iSCSI login request for"
737 " %u seconds.\n", TA_LOGIN_TIMEOUT);
738 spin_unlock_bh(&np->np_thread_lock);
739}
740
741static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
742{
743 spin_lock_bh(&np->np_thread_lock);
744 if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
745 spin_unlock_bh(&np->np_thread_lock);
746 return;
747 }
748 np->np_login_timer_flags |= ISCSI_TF_STOP;
749 spin_unlock_bh(&np->np_thread_lock);
750
751 del_timer_sync(&np->np_login_timer);
752
753 spin_lock_bh(&np->np_thread_lock);
754 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
755 spin_unlock_bh(&np->np_thread_lock);
756}
757
758int iscsi_target_setup_login_socket(
759 struct iscsi_np *np,
760 struct __kernel_sockaddr_storage *sockaddr)
761{
762 struct socket *sock;
763 int backlog = 5, ret, opt = 0, len;
764
765 switch (np->np_network_transport) {
766 case ISCSI_TCP:
767 np->np_ip_proto = IPPROTO_TCP;
768 np->np_sock_type = SOCK_STREAM;
769 break;
770 case ISCSI_SCTP_TCP:
771 np->np_ip_proto = IPPROTO_SCTP;
772 np->np_sock_type = SOCK_STREAM;
773 break;
774 case ISCSI_SCTP_UDP:
775 np->np_ip_proto = IPPROTO_SCTP;
776 np->np_sock_type = SOCK_SEQPACKET;
777 break;
778 case ISCSI_IWARP_TCP:
779 case ISCSI_IWARP_SCTP:
780 case ISCSI_INFINIBAND:
781 default:
782 pr_err("Unsupported network_transport: %d\n",
783 np->np_network_transport);
784 return -EINVAL;
785 }
786
787 ret = sock_create(sockaddr->ss_family, np->np_sock_type,
788 np->np_ip_proto, &sock);
789 if (ret < 0) {
790 pr_err("sock_create() failed.\n");
791 return ret;
792 }
793 np->np_socket = sock;
794 /*
795 * The SCTP stack needs struct socket->file.
796 */
797 if ((np->np_network_transport == ISCSI_SCTP_TCP) ||
798 (np->np_network_transport == ISCSI_SCTP_UDP)) {
799 if (!sock->file) {
800 sock->file = kzalloc(sizeof(struct file), GFP_KERNEL);
801 if (!sock->file) {
802 pr_err("Unable to allocate struct"
803 " file for SCTP\n");
804 ret = -ENOMEM;
805 goto fail;
806 }
807 np->np_flags |= NPF_SCTP_STRUCT_FILE;
808 }
809 }
810 /*
811 * Setup the np->np_sockaddr from the passed sockaddr setup
812 * in iscsi_target_configfs.c code..
813 */
814 memcpy((void *)&np->np_sockaddr, (void *)sockaddr,
815 sizeof(struct __kernel_sockaddr_storage));
816
817 if (sockaddr->ss_family == AF_INET6)
818 len = sizeof(struct sockaddr_in6);
819 else
820 len = sizeof(struct sockaddr_in);
821 /*
822 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
823 */
824 opt = 1;
825 if (np->np_network_transport == ISCSI_TCP) {
826 ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
827 (char *)&opt, sizeof(opt));
828 if (ret < 0) {
829 pr_err("kernel_setsockopt() for TCP_NODELAY"
830 " failed: %d\n", ret);
831 goto fail;
832 }
833 }
834
835 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
836 (char *)&opt, sizeof(opt));
837 if (ret < 0) {
838 pr_err("kernel_setsockopt() for SO_REUSEADDR"
839 " failed\n");
840 goto fail;
841 }
842
843 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
844 if (ret < 0) {
845 pr_err("kernel_bind() failed: %d\n", ret);
846 goto fail;
847 }
848
849 ret = kernel_listen(sock, backlog);
850 if (ret != 0) {
851 pr_err("kernel_listen() failed: %d\n", ret);
852 goto fail;
853 }
854
855 return 0;
856
857fail:
858 np->np_socket = NULL;
859 if (sock) {
860 if (np->np_flags & NPF_SCTP_STRUCT_FILE) {
861 kfree(sock->file);
862 sock->file = NULL;
863 }
864
865 sock_release(sock);
866 }
867 return ret;
868}
869
870static int __iscsi_target_login_thread(struct iscsi_np *np)
871{
872 u8 buffer[ISCSI_HDR_LEN], iscsi_opcode, zero_tsih = 0;
873 int err, ret = 0, ip_proto, sock_type, set_sctp_conn_flag, 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;
878 struct kvec iov;
879 struct iscsi_login_req *pdu;
880 struct sockaddr_in sock_in;
881 struct sockaddr_in6 sock_in6;
882
883 flush_signals(current);
884 set_sctp_conn_flag = 0;
885 sock = np->np_socket;
886 ip_proto = np->np_ip_proto;
887 sock_type = np->np_sock_type;
888
889 spin_lock_bh(&np->np_thread_lock);
890 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
891 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
892 complete(&np->np_restart_comp);
893 } else {
894 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
895 }
896 spin_unlock_bh(&np->np_thread_lock);
897
898 if (kernel_accept(sock, &new_sock, 0) < 0) {
899 spin_lock_bh(&np->np_thread_lock);
900 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
901 spin_unlock_bh(&np->np_thread_lock);
902 complete(&np->np_restart_comp);
903 /* Get another socket */
904 return 1;
905 }
906 spin_unlock_bh(&np->np_thread_lock);
907 goto out;
908 }
909 /*
910 * The SCTP stack needs struct socket->file.
911 */
912 if ((np->np_network_transport == ISCSI_SCTP_TCP) ||
913 (np->np_network_transport == ISCSI_SCTP_UDP)) {
914 if (!new_sock->file) {
915 new_sock->file = kzalloc(
916 sizeof(struct file), GFP_KERNEL);
917 if (!new_sock->file) {
918 pr_err("Unable to allocate struct"
919 " file for SCTP\n");
920 sock_release(new_sock);
921 /* Get another socket */
922 return 1;
923 }
924 set_sctp_conn_flag = 1;
925 }
926 }
927
928 iscsi_start_login_thread_timer(np);
929
930 conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
931 if (!conn) {
932 pr_err("Could not allocate memory for"
933 " new connection\n");
934 if (set_sctp_conn_flag) {
935 kfree(new_sock->file);
936 new_sock->file = NULL;
937 }
938 sock_release(new_sock);
939 /* Get another socket */
940 return 1;
941 }
942
943 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
944 conn->conn_state = TARG_CONN_STATE_FREE;
945 conn->sock = new_sock;
946
947 if (set_sctp_conn_flag)
948 conn->conn_flags |= CONNFLAG_SCTP_STRUCT_FILE;
949
950 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
951 conn->conn_state = TARG_CONN_STATE_XPT_UP;
952
953 /*
954 * Allocate conn->conn_ops early as a failure calling
955 * iscsit_tx_login_rsp() below will call tx_data().
956 */
957 conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
958 if (!conn->conn_ops) {
959 pr_err("Unable to allocate memory for"
960 " struct iscsi_conn_ops.\n");
961 goto new_sess_out;
962 }
963 /*
964 * Perform the remaining iSCSI connection initialization items..
965 */
966 if (iscsi_login_init_conn(conn) < 0)
967 goto new_sess_out;
968
969 memset(buffer, 0, ISCSI_HDR_LEN);
970 memset(&iov, 0, sizeof(struct kvec));
971 iov.iov_base = buffer;
972 iov.iov_len = ISCSI_HDR_LEN;
973
974 if (rx_data(conn, &iov, 1, ISCSI_HDR_LEN) <= 0) {
975 pr_err("rx_data() returned an error.\n");
976 goto new_sess_out;
977 }
978
979 iscsi_opcode = (buffer[0] & ISCSI_OPCODE_MASK);
980 if (!(iscsi_opcode & ISCSI_OP_LOGIN)) {
981 pr_err("First opcode is not login request,"
982 " failing login request.\n");
983 goto new_sess_out;
984 }
985
986 pdu = (struct iscsi_login_req *) buffer;
987 pdu->cid = be16_to_cpu(pdu->cid);
988 pdu->tsih = be16_to_cpu(pdu->tsih);
989 pdu->itt = be32_to_cpu(pdu->itt);
990 pdu->cmdsn = be32_to_cpu(pdu->cmdsn);
991 pdu->exp_statsn = be32_to_cpu(pdu->exp_statsn);
992 /*
993 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
994 * when Status-Class != 0.
995 */
996 conn->login_itt = pdu->itt;
997
998 spin_lock_bh(&np->np_thread_lock);
999 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1000 spin_unlock_bh(&np->np_thread_lock);
1001 pr_err("iSCSI Network Portal on %s:%hu currently not"
1002 " active.\n", np->np_ip, np->np_port);
1003 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1004 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1005 goto new_sess_out;
1006 }
1007 spin_unlock_bh(&np->np_thread_lock);
1008
1009 if (np->np_sockaddr.ss_family == AF_INET6) {
1010 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1011
1012 if (conn->sock->ops->getname(conn->sock,
1013 (struct sockaddr *)&sock_in6, &err, 1) < 0) {
1014 pr_err("sock_ops->getname() failed.\n");
1015 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1016 ISCSI_LOGIN_STATUS_TARGET_ERROR);
1017 goto new_sess_out;
1018 }
6626a057
CB		 1019 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
1020 &sock_in6.sin6_addr.in6_u);
1021 conn->login_port = ntohs(sock_in6.sin6_port);
e48354ce
NB		 1022 } else {
1023 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1024
1025 if (conn->sock->ops->getname(conn->sock,
1026 (struct sockaddr *)&sock_in, &err, 1) < 0) {
1027 pr_err("sock_ops->getname() failed.\n");
1028 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1029 ISCSI_LOGIN_STATUS_TARGET_ERROR);
1030 goto new_sess_out;
1031 }
1032 sprintf(conn->login_ip, "%pI4", &sock_in.sin_addr.s_addr);
1033 conn->login_port = ntohs(sock_in.sin_port);
1034 }
1035
1036 conn->network_transport = np->np_network_transport;
1037
1038 pr_debug("Received iSCSI login request from %s on %s Network"
1039 " Portal %s:%hu\n", conn->login_ip,
1040 (conn->network_transport == ISCSI_TCP) ? "TCP" : "SCTP",
1041 np->np_ip, np->np_port);
1042
1043 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1044 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;
1045
1046 if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1047 pdu->min_version) < 0)
1048 goto new_sess_out;
1049
1050 zero_tsih = (pdu->tsih == 0x0000);
1051 if ((zero_tsih)) {
1052 /*
1053 * This is the leading connection of a new session.
1054 * We wait until after authentication to check for
1055 * session reinstatement.
1056 */
1057 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1058 goto new_sess_out;
1059 } else {
1060 /*
1061 * Add a new connection to an existing session.
1062 * We check for a non-existant session in
1063 * iscsi_login_non_zero_tsih_s2() below based
1064 * on ISID/TSIH, but wait until after authentication
1065 * to check for connection reinstatement, etc.
1066 */
1067 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1068 goto new_sess_out;
1069 }
1070
1071 /*
1072 * This will process the first login request, and call
1073 * iscsi_target_locate_portal(), and return a valid struct iscsi_login.
1074 */
1075 login = iscsi_target_init_negotiation(np, conn, buffer);
1076 if (!login) {
1077 tpg = conn->tpg;
1078 goto new_sess_out;
1079 }
1080
1081 tpg = conn->tpg;
1082 if (!tpg) {
1083 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1084 goto new_sess_out;
1085 }
1086
1087 if (zero_tsih) {
1088 if (iscsi_login_zero_tsih_s2(conn) < 0) {
1089 iscsi_target_nego_release(login, conn);
1090 goto new_sess_out;
1091 }
1092 } else {
1093 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0) {
1094 iscsi_target_nego_release(login, conn);
1095 goto old_sess_out;
1096 }
1097 }
1098
1099 if (iscsi_target_start_negotiation(login, conn) < 0)
1100 goto new_sess_out;
1101
1102 if (!conn->sess) {
1103 pr_err("struct iscsi_conn session pointer is NULL!\n");
1104 goto new_sess_out;
1105 }
1106
1107 iscsi_stop_login_thread_timer(np);
1108
1109 if (signal_pending(current))
1110 goto new_sess_out;
1111
1112 ret = iscsi_post_login_handler(np, conn, zero_tsih);
1113
1114 if (ret < 0)
1115 goto new_sess_out;
1116
1117 iscsit_deaccess_np(np, tpg);
1118 tpg = NULL;
1119 /* Get another socket */
1120 return 1;
1121
1122new_sess_out:
1123 pr_err("iSCSI Login negotiation failed.\n");
1124 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1125 ISCSI_LOGIN_STATUS_INIT_ERR);
1126 if (!zero_tsih || !conn->sess)
1127 goto old_sess_out;
1128 if (conn->sess->se_sess)
1129 transport_free_session(conn->sess->se_sess);
1130 if (conn->sess->session_index != 0) {
1131 spin_lock_bh(&sess_idr_lock);
1132 idr_remove(&sess_idr, conn->sess->session_index);
1133 spin_unlock_bh(&sess_idr_lock);
1134 }
1135 if (conn->sess->sess_ops)
1136 kfree(conn->sess->sess_ops);
1137 if (conn->sess)
1138 kfree(conn->sess);
1139old_sess_out:
1140 iscsi_stop_login_thread_timer(np);
1141 /*
1142 * If login negotiation fails check if the Time2Retain timer
1143 * needs to be restarted.
1144 */
1145 if (!zero_tsih && conn->sess) {
1146 spin_lock_bh(&conn->sess->conn_lock);
1147 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1148 struct se_portal_group *se_tpg =
1149 &ISCSI_TPG_C(conn)->tpg_se_tpg;
1150
1151 atomic_set(&conn->sess->session_continuation, 0);
1152 spin_unlock_bh(&conn->sess->conn_lock);
1153 spin_lock_bh(&se_tpg->session_lock);
1154 iscsit_start_time2retain_handler(conn->sess);
1155 spin_unlock_bh(&se_tpg->session_lock);
1156 } else
1157 spin_unlock_bh(&conn->sess->conn_lock);
1158 iscsit_dec_session_usage_count(conn->sess);
1159 }
1160
1161 if (!IS_ERR(conn->conn_rx_hash.tfm))
1162 crypto_free_hash(conn->conn_rx_hash.tfm);
1163 if (!IS_ERR(conn->conn_tx_hash.tfm))
1164 crypto_free_hash(conn->conn_tx_hash.tfm);
1165
1166 if (conn->conn_cpumask)
1167 free_cpumask_var(conn->conn_cpumask);
1168
1169 kfree(conn->conn_ops);
1170
1171 if (conn->param_list) {
1172 iscsi_release_param_list(conn->param_list);
1173 conn->param_list = NULL;
1174 }
1175 if (conn->sock) {
1176 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
1177 kfree(conn->sock->file);
1178 conn->sock->file = NULL;
1179 }
1180 sock_release(conn->sock);
1181 }
1182 kfree(conn);
1183
1184 if (tpg) {
1185 iscsit_deaccess_np(np, tpg);
1186 tpg = NULL;
1187 }
1188
1189out:
1190 stop = kthread_should_stop();
1191 if (!stop && signal_pending(current)) {
1192 spin_lock_bh(&np->np_thread_lock);
1193 stop = (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN);
1194 spin_unlock_bh(&np->np_thread_lock);
1195 }
1196 /* Wait for another socket.. */
1197 if (!stop)
1198 return 1;
1199
1200 iscsi_stop_login_thread_timer(np);
1201 spin_lock_bh(&np->np_thread_lock);
1202 np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1203 spin_unlock_bh(&np->np_thread_lock);
1204 return 0;
1205}
1206
1207int iscsi_target_login_thread(void *arg)
1208{
1209 struct iscsi_np *np = (struct iscsi_np *)arg;
1210 int ret;
1211
1212 allow_signal(SIGINT);
1213
1214 while (!kthread_should_stop()) {
1215 ret = __iscsi_target_login_thread(np);
1216 /*
1217 * We break and exit here unless another sock_accept() call
1218 * is expected.
1219 */
1220 if (ret != 1)
1221 break;
1222 }
1223
1224 return 0;
1225}
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