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target: remove useless casts
[deliverable/linux.git] / drivers / target / iscsi / iscsi_target_login.c
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>
26 #include <target/target_core_fabric.h>
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
41 extern struct idr sess_idr;
42 extern struct mutex auth_id_lock;
43 extern spinlock_t sess_idr_lock;
44
45 static 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 */
77 int 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
104 static 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
121 int 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 = 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(sess_p->isid, conn->sess->isid, 6) &&
155 (!strcmp(sess_p->sess_ops->InitiatorName,
156 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
193 static 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 */
215 static 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");
227 return -ENOMEM;
228 }
229
230 iscsi_login_set_conn_values(sess, conn, pdu->cid);
231 sess->init_task_tag = pdu->itt;
232 memcpy(&sess->isid, 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);
253 kfree(sess);
254 return -ENOMEM;
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");
274 kfree(sess);
275 return -ENOMEM;
276 }
277
278 sess->se_sess = transport_init_session();
279 if (IS_ERR(sess->se_sess)) {
280 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
281 ISCSI_LOGIN_STATUS_NO_RESOURCES);
282 kfree(sess);
283 return -ENOMEM;
284 }
285
286 return 0;
287 }
288
289 static 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 */
362 int 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
411 static 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 */
424 static 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(sess_p->isid, pdu->isid, 6) &&
444 (sess_p->tsih == pdu->tsih)) {
445 iscsit_inc_session_usage_count(sess_p);
446 iscsit_stop_time2retain_timer(sess_p);
447 sess = sess_p;
448 break;
449 }
450 }
451 spin_unlock_bh(&se_tpg->session_lock);
452
453 /*
454 * If the Time2Retain handler has expired, the session is already gone.
455 */
456 if (!sess) {
457 pr_err("Initiator attempting to add a connection to"
458 " a non-existent session, rejecting iSCSI Login.\n");
459 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
460 ISCSI_LOGIN_STATUS_NO_SESSION);
461 return -1;
462 }
463
464 /*
465 * Stop the Time2Retain timer if this is a failed session, we restart
466 * the timer if the login is not successful.
467 */
468 spin_lock_bh(&sess->conn_lock);
469 if (sess->session_state == TARG_SESS_STATE_FAILED)
470 atomic_set(&sess->session_continuation, 1);
471 spin_unlock_bh(&sess->conn_lock);
472
473 iscsi_login_set_conn_values(sess, conn, pdu->cid);
474
475 if (iscsi_copy_param_list(&conn->param_list,
476 ISCSI_TPG_C(conn)->param_list, 0) < 0) {
477 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
478 ISCSI_LOGIN_STATUS_NO_RESOURCES);
479 return -1;
480 }
481
482 iscsi_set_keys_to_negotiate(0, conn->param_list);
483 /*
484 * Need to send TargetPortalGroupTag back in first login response
485 * on any iSCSI connection where the Initiator provides TargetName.
486 * See 5.3.1. Login Phase Start
487 *
488 * In our case, we have already located the struct iscsi_tiqn at this point.
489 */
490 memset(buf, 0, 32);
491 sprintf(buf, "TargetPortalGroupTag=%hu", ISCSI_TPG_S(sess)->tpgt);
492 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
493 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
494 ISCSI_LOGIN_STATUS_NO_RESOURCES);
495 return -1;
496 }
497
498 return iscsi_login_disable_FIM_keys(conn->param_list, conn);
499 }
500
501 int iscsi_login_post_auth_non_zero_tsih(
502 struct iscsi_conn *conn,
503 u16 cid,
504 u32 exp_statsn)
505 {
506 struct iscsi_conn *conn_ptr = NULL;
507 struct iscsi_conn_recovery *cr = NULL;
508 struct iscsi_session *sess = conn->sess;
509
510 /*
511 * By following item 5 in the login table, if we have found
512 * an existing ISID and a valid/existing TSIH and an existing
513 * CID we do connection reinstatement. Currently we dont not
514 * support it so we send back an non-zero status class to the
515 * initiator and release the new connection.
516 */
517 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
518 if ((conn_ptr)) {
519 pr_err("Connection exists with CID %hu for %s,"
520 " performing connection reinstatement.\n",
521 conn_ptr->cid, sess->sess_ops->InitiatorName);
522
523 iscsit_connection_reinstatement_rcfr(conn_ptr);
524 iscsit_dec_conn_usage_count(conn_ptr);
525 }
526
527 /*
528 * Check for any connection recovery entires containing CID.
529 * We use the original ExpStatSN sent in the first login request
530 * to acknowledge commands for the failed connection.
531 *
532 * Also note that an explict logout may have already been sent,
533 * but the response may not be sent due to additional connection
534 * loss.
535 */
536 if (sess->sess_ops->ErrorRecoveryLevel == 2) {
537 cr = iscsit_get_inactive_connection_recovery_entry(
538 sess, cid);
539 if ((cr)) {
540 pr_debug("Performing implicit logout"
541 " for connection recovery on CID: %hu\n",
542 conn->cid);
543 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
544 }
545 }
546
547 /*
548 * Else we follow item 4 from the login table in that we have
549 * found an existing ISID and a valid/existing TSIH and a new
550 * CID we go ahead and continue to add a new connection to the
551 * session.
552 */
553 pr_debug("Adding CID %hu to existing session for %s.\n",
554 cid, sess->sess_ops->InitiatorName);
555
556 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
557 pr_err("Adding additional connection to this session"
558 " would exceed MaxConnections %d, login failed.\n",
559 sess->sess_ops->MaxConnections);
560 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
561 ISCSI_LOGIN_STATUS_ISID_ERROR);
562 return -1;
563 }
564
565 return 0;
566 }
567
568 static void iscsi_post_login_start_timers(struct iscsi_conn *conn)
569 {
570 struct iscsi_session *sess = conn->sess;
571
572 if (!sess->sess_ops->SessionType)
573 iscsit_start_nopin_timer(conn);
574 }
575
576 static int iscsi_post_login_handler(
577 struct iscsi_np *np,
578 struct iscsi_conn *conn,
579 u8 zero_tsih)
580 {
581 int stop_timer = 0;
582 struct iscsi_session *sess = conn->sess;
583 struct se_session *se_sess = sess->se_sess;
584 struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
585 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
586 struct iscsi_thread_set *ts;
587
588 iscsit_inc_conn_usage_count(conn);
589
590 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
591 ISCSI_LOGIN_STATUS_ACCEPT);
592
593 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
594 conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
595
596 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
597 iscsit_set_sync_and_steering_values(conn);
598 /*
599 * SCSI Initiator -> SCSI Target Port Mapping
600 */
601 ts = iscsi_get_thread_set();
602 if (!zero_tsih) {
603 iscsi_set_session_parameters(sess->sess_ops,
604 conn->param_list, 0);
605 iscsi_release_param_list(conn->param_list);
606 conn->param_list = NULL;
607
608 spin_lock_bh(&sess->conn_lock);
609 atomic_set(&sess->session_continuation, 0);
610 if (sess->session_state == TARG_SESS_STATE_FAILED) {
611 pr_debug("Moving to"
612 " TARG_SESS_STATE_LOGGED_IN.\n");
613 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
614 stop_timer = 1;
615 }
616
617 pr_debug("iSCSI Login successful on CID: %hu from %s to"
618 " %s:%hu,%hu\n", conn->cid, conn->login_ip, np->np_ip,
619 np->np_port, tpg->tpgt);
620
621 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
622 atomic_inc(&sess->nconn);
623 pr_debug("Incremented iSCSI Connection count to %hu"
624 " from node: %s\n", atomic_read(&sess->nconn),
625 sess->sess_ops->InitiatorName);
626 spin_unlock_bh(&sess->conn_lock);
627
628 iscsi_post_login_start_timers(conn);
629 iscsi_activate_thread_set(conn, ts);
630 /*
631 * Determine CPU mask to ensure connection's RX and TX kthreads
632 * are scheduled on the same CPU.
633 */
634 iscsit_thread_get_cpumask(conn);
635 conn->conn_rx_reset_cpumask = 1;
636 conn->conn_tx_reset_cpumask = 1;
637
638 iscsit_dec_conn_usage_count(conn);
639 if (stop_timer) {
640 spin_lock_bh(&se_tpg->session_lock);
641 iscsit_stop_time2retain_timer(sess);
642 spin_unlock_bh(&se_tpg->session_lock);
643 }
644 iscsit_dec_session_usage_count(sess);
645 return 0;
646 }
647
648 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
649 iscsi_release_param_list(conn->param_list);
650 conn->param_list = NULL;
651
652 iscsit_determine_maxcmdsn(sess);
653
654 spin_lock_bh(&se_tpg->session_lock);
655 __transport_register_session(&sess->tpg->tpg_se_tpg,
656 se_sess->se_node_acl, se_sess, sess);
657 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
658 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
659
660 pr_debug("iSCSI Login successful on CID: %hu from %s to %s:%hu,%hu\n",
661 conn->cid, conn->login_ip, np->np_ip, np->np_port, tpg->tpgt);
662
663 spin_lock_bh(&sess->conn_lock);
664 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
665 atomic_inc(&sess->nconn);
666 pr_debug("Incremented iSCSI Connection count to %hu from node:"
667 " %s\n", atomic_read(&sess->nconn),
668 sess->sess_ops->InitiatorName);
669 spin_unlock_bh(&sess->conn_lock);
670
671 sess->sid = tpg->sid++;
672 if (!sess->sid)
673 sess->sid = tpg->sid++;
674 pr_debug("Established iSCSI session from node: %s\n",
675 sess->sess_ops->InitiatorName);
676
677 tpg->nsessions++;
678 if (tpg->tpg_tiqn)
679 tpg->tpg_tiqn->tiqn_nsessions++;
680
681 pr_debug("Incremented number of active iSCSI sessions to %u on"
682 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
683 spin_unlock_bh(&se_tpg->session_lock);
684
685 iscsi_post_login_start_timers(conn);
686 iscsi_activate_thread_set(conn, ts);
687 /*
688 * Determine CPU mask to ensure connection's RX and TX kthreads
689 * are scheduled on the same CPU.
690 */
691 iscsit_thread_get_cpumask(conn);
692 conn->conn_rx_reset_cpumask = 1;
693 conn->conn_tx_reset_cpumask = 1;
694
695 iscsit_dec_conn_usage_count(conn);
696
697 return 0;
698 }
699
700 static void iscsi_handle_login_thread_timeout(unsigned long data)
701 {
702 struct iscsi_np *np = (struct iscsi_np *) data;
703
704 spin_lock_bh(&np->np_thread_lock);
705 pr_err("iSCSI Login timeout on Network Portal %s:%hu\n",
706 np->np_ip, np->np_port);
707
708 if (np->np_login_timer_flags & ISCSI_TF_STOP) {
709 spin_unlock_bh(&np->np_thread_lock);
710 return;
711 }
712
713 if (np->np_thread)
714 send_sig(SIGINT, np->np_thread, 1);
715
716 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
717 spin_unlock_bh(&np->np_thread_lock);
718 }
719
720 static void iscsi_start_login_thread_timer(struct iscsi_np *np)
721 {
722 /*
723 * This used the TA_LOGIN_TIMEOUT constant because at this
724 * point we do not have access to ISCSI_TPG_ATTRIB(tpg)->login_timeout
725 */
726 spin_lock_bh(&np->np_thread_lock);
727 init_timer(&np->np_login_timer);
728 np->np_login_timer.expires = (get_jiffies_64() + TA_LOGIN_TIMEOUT * HZ);
729 np->np_login_timer.data = (unsigned long)np;
730 np->np_login_timer.function = iscsi_handle_login_thread_timeout;
731 np->np_login_timer_flags &= ~ISCSI_TF_STOP;
732 np->np_login_timer_flags |= ISCSI_TF_RUNNING;
733 add_timer(&np->np_login_timer);
734
735 pr_debug("Added timeout timer to iSCSI login request for"
736 " %u seconds.\n", TA_LOGIN_TIMEOUT);
737 spin_unlock_bh(&np->np_thread_lock);
738 }
739
740 static void iscsi_stop_login_thread_timer(struct iscsi_np *np)
741 {
742 spin_lock_bh(&np->np_thread_lock);
743 if (!(np->np_login_timer_flags & ISCSI_TF_RUNNING)) {
744 spin_unlock_bh(&np->np_thread_lock);
745 return;
746 }
747 np->np_login_timer_flags |= ISCSI_TF_STOP;
748 spin_unlock_bh(&np->np_thread_lock);
749
750 del_timer_sync(&np->np_login_timer);
751
752 spin_lock_bh(&np->np_thread_lock);
753 np->np_login_timer_flags &= ~ISCSI_TF_RUNNING;
754 spin_unlock_bh(&np->np_thread_lock);
755 }
756
757 int iscsi_target_setup_login_socket(
758 struct iscsi_np *np,
759 struct __kernel_sockaddr_storage *sockaddr)
760 {
761 struct socket *sock;
762 int backlog = 5, ret, opt = 0, len;
763
764 switch (np->np_network_transport) {
765 case ISCSI_TCP:
766 np->np_ip_proto = IPPROTO_TCP;
767 np->np_sock_type = SOCK_STREAM;
768 break;
769 case ISCSI_SCTP_TCP:
770 np->np_ip_proto = IPPROTO_SCTP;
771 np->np_sock_type = SOCK_STREAM;
772 break;
773 case ISCSI_SCTP_UDP:
774 np->np_ip_proto = IPPROTO_SCTP;
775 np->np_sock_type = SOCK_SEQPACKET;
776 break;
777 case ISCSI_IWARP_TCP:
778 case ISCSI_IWARP_SCTP:
779 case ISCSI_INFINIBAND:
780 default:
781 pr_err("Unsupported network_transport: %d\n",
782 np->np_network_transport);
783 return -EINVAL;
784 }
785
786 ret = sock_create(sockaddr->ss_family, np->np_sock_type,
787 np->np_ip_proto, &sock);
788 if (ret < 0) {
789 pr_err("sock_create() failed.\n");
790 return ret;
791 }
792 np->np_socket = sock;
793 /*
794 * The SCTP stack needs struct socket->file.
795 */
796 if ((np->np_network_transport == ISCSI_SCTP_TCP) ||
797 (np->np_network_transport == ISCSI_SCTP_UDP)) {
798 if (!sock->file) {
799 sock->file = kzalloc(sizeof(struct file), GFP_KERNEL);
800 if (!sock->file) {
801 pr_err("Unable to allocate struct"
802 " file for SCTP\n");
803 ret = -ENOMEM;
804 goto fail;
805 }
806 np->np_flags |= NPF_SCTP_STRUCT_FILE;
807 }
808 }
809 /*
810 * Setup the np->np_sockaddr from the passed sockaddr setup
811 * in iscsi_target_configfs.c code..
812 */
813 memcpy(&np->np_sockaddr, sockaddr,
814 sizeof(struct __kernel_sockaddr_storage));
815
816 if (sockaddr->ss_family == AF_INET6)
817 len = sizeof(struct sockaddr_in6);
818 else
819 len = sizeof(struct sockaddr_in);
820 /*
821 * Set SO_REUSEADDR, and disable Nagel Algorithm with TCP_NODELAY.
822 */
823 /* FIXME: Someone please explain why this is endian-safe */
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 /* FIXME: Someone please explain why this is endian-safe */
836 ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
837 (char *)&opt, sizeof(opt));
838 if (ret < 0) {
839 pr_err("kernel_setsockopt() for SO_REUSEADDR"
840 " failed\n");
841 goto fail;
842 }
843
844 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
845 if (ret < 0) {
846 pr_err("kernel_bind() failed: %d\n", ret);
847 goto fail;
848 }
849
850 ret = kernel_listen(sock, backlog);
851 if (ret != 0) {
852 pr_err("kernel_listen() failed: %d\n", ret);
853 goto fail;
854 }
855
856 return 0;
857
858 fail:
859 np->np_socket = NULL;
860 if (sock) {
861 if (np->np_flags & NPF_SCTP_STRUCT_FILE) {
862 kfree(sock->file);
863 sock->file = NULL;
864 }
865
866 sock_release(sock);
867 }
868 return ret;
869 }
870
871 static int __iscsi_target_login_thread(struct iscsi_np *np)
872 {
873 u8 buffer[ISCSI_HDR_LEN], iscsi_opcode, zero_tsih = 0;
874 int err, ret = 0, ip_proto, sock_type, set_sctp_conn_flag, stop;
875 struct iscsi_conn *conn = NULL;
876 struct iscsi_login *login;
877 struct iscsi_portal_group *tpg = NULL;
878 struct socket *new_sock, *sock;
879 struct kvec iov;
880 struct iscsi_login_req *pdu;
881 struct sockaddr_in sock_in;
882 struct sockaddr_in6 sock_in6;
883
884 flush_signals(current);
885 set_sctp_conn_flag = 0;
886 sock = np->np_socket;
887 ip_proto = np->np_ip_proto;
888 sock_type = np->np_sock_type;
889
890 spin_lock_bh(&np->np_thread_lock);
891 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
892 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
893 complete(&np->np_restart_comp);
894 } else {
895 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
896 }
897 spin_unlock_bh(&np->np_thread_lock);
898
899 if (kernel_accept(sock, &new_sock, 0) < 0) {
900 spin_lock_bh(&np->np_thread_lock);
901 if (np->np_thread_state == ISCSI_NP_THREAD_RESET) {
902 spin_unlock_bh(&np->np_thread_lock);
903 complete(&np->np_restart_comp);
904 /* Get another socket */
905 return 1;
906 }
907 spin_unlock_bh(&np->np_thread_lock);
908 goto out;
909 }
910 /*
911 * The SCTP stack needs struct socket->file.
912 */
913 if ((np->np_network_transport == ISCSI_SCTP_TCP) ||
914 (np->np_network_transport == ISCSI_SCTP_UDP)) {
915 if (!new_sock->file) {
916 new_sock->file = kzalloc(
917 sizeof(struct file), GFP_KERNEL);
918 if (!new_sock->file) {
919 pr_err("Unable to allocate struct"
920 " file for SCTP\n");
921 sock_release(new_sock);
922 /* Get another socket */
923 return 1;
924 }
925 set_sctp_conn_flag = 1;
926 }
927 }
928
929 iscsi_start_login_thread_timer(np);
930
931 conn = kzalloc(sizeof(struct iscsi_conn), GFP_KERNEL);
932 if (!conn) {
933 pr_err("Could not allocate memory for"
934 " new connection\n");
935 if (set_sctp_conn_flag) {
936 kfree(new_sock->file);
937 new_sock->file = NULL;
938 }
939 sock_release(new_sock);
940 /* Get another socket */
941 return 1;
942 }
943
944 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
945 conn->conn_state = TARG_CONN_STATE_FREE;
946 conn->sock = new_sock;
947
948 if (set_sctp_conn_flag)
949 conn->conn_flags |= CONNFLAG_SCTP_STRUCT_FILE;
950
951 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
952 conn->conn_state = TARG_CONN_STATE_XPT_UP;
953
954 /*
955 * Allocate conn->conn_ops early as a failure calling
956 * iscsit_tx_login_rsp() below will call tx_data().
957 */
958 conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
959 if (!conn->conn_ops) {
960 pr_err("Unable to allocate memory for"
961 " struct iscsi_conn_ops.\n");
962 goto new_sess_out;
963 }
964 /*
965 * Perform the remaining iSCSI connection initialization items..
966 */
967 if (iscsi_login_init_conn(conn) < 0)
968 goto new_sess_out;
969
970 memset(buffer, 0, ISCSI_HDR_LEN);
971 memset(&iov, 0, sizeof(struct kvec));
972 iov.iov_base = buffer;
973 iov.iov_len = ISCSI_HDR_LEN;
974
975 if (rx_data(conn, &iov, 1, ISCSI_HDR_LEN) <= 0) {
976 pr_err("rx_data() returned an error.\n");
977 goto new_sess_out;
978 }
979
980 iscsi_opcode = (buffer[0] & ISCSI_OPCODE_MASK);
981 if (!(iscsi_opcode & ISCSI_OP_LOGIN)) {
982 pr_err("First opcode is not login request,"
983 " failing login request.\n");
984 goto new_sess_out;
985 }
986
987 pdu = (struct iscsi_login_req *) buffer;
988 pdu->cid = be16_to_cpu(pdu->cid);
989 pdu->tsih = be16_to_cpu(pdu->tsih);
990 pdu->itt = be32_to_cpu(pdu->itt);
991 pdu->cmdsn = be32_to_cpu(pdu->cmdsn);
992 pdu->exp_statsn = be32_to_cpu(pdu->exp_statsn);
993 /*
994 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
995 * when Status-Class != 0.
996 */
997 conn->login_itt = pdu->itt;
998
999 spin_lock_bh(&np->np_thread_lock);
1000 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1001 spin_unlock_bh(&np->np_thread_lock);
1002 pr_err("iSCSI Network Portal on %s:%hu currently not"
1003 " active.\n", np->np_ip, np->np_port);
1004 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1005 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1006 goto new_sess_out;
1007 }
1008 spin_unlock_bh(&np->np_thread_lock);
1009
1010 if (np->np_sockaddr.ss_family == AF_INET6) {
1011 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
1012
1013 if (conn->sock->ops->getname(conn->sock,
1014 (struct sockaddr *)&sock_in6, &err, 1) < 0) {
1015 pr_err("sock_ops->getname() failed.\n");
1016 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1017 ISCSI_LOGIN_STATUS_TARGET_ERROR);
1018 goto new_sess_out;
1019 }
1020 snprintf(conn->login_ip, sizeof(conn->login_ip), "%pI6c",
1021 &sock_in6.sin6_addr.in6_u);
1022 conn->login_port = ntohs(sock_in6.sin6_port);
1023 } else {
1024 memset(&sock_in, 0, sizeof(struct sockaddr_in));
1025
1026 if (conn->sock->ops->getname(conn->sock,
1027 (struct sockaddr *)&sock_in, &err, 1) < 0) {
1028 pr_err("sock_ops->getname() failed.\n");
1029 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1030 ISCSI_LOGIN_STATUS_TARGET_ERROR);
1031 goto new_sess_out;
1032 }
1033 sprintf(conn->login_ip, "%pI4", &sock_in.sin_addr.s_addr);
1034 conn->login_port = ntohs(sock_in.sin_port);
1035 }
1036
1037 conn->network_transport = np->np_network_transport;
1038
1039 pr_debug("Received iSCSI login request from %s on %s Network"
1040 " Portal %s:%hu\n", conn->login_ip,
1041 (conn->network_transport == ISCSI_TCP) ? "TCP" : "SCTP",
1042 np->np_ip, np->np_port);
1043
1044 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1045 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;
1046
1047 if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1048 pdu->min_version) < 0)
1049 goto new_sess_out;
1050
1051 zero_tsih = (pdu->tsih == 0x0000);
1052 if ((zero_tsih)) {
1053 /*
1054 * This is the leading connection of a new session.
1055 * We wait until after authentication to check for
1056 * session reinstatement.
1057 */
1058 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1059 goto new_sess_out;
1060 } else {
1061 /*
1062 * Add a new connection to an existing session.
1063 * We check for a non-existant session in
1064 * iscsi_login_non_zero_tsih_s2() below based
1065 * on ISID/TSIH, but wait until after authentication
1066 * to check for connection reinstatement, etc.
1067 */
1068 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1069 goto new_sess_out;
1070 }
1071
1072 /*
1073 * This will process the first login request, and call
1074 * iscsi_target_locate_portal(), and return a valid struct iscsi_login.
1075 */
1076 login = iscsi_target_init_negotiation(np, conn, buffer);
1077 if (!login) {
1078 tpg = conn->tpg;
1079 goto new_sess_out;
1080 }
1081
1082 tpg = conn->tpg;
1083 if (!tpg) {
1084 pr_err("Unable to locate struct iscsi_conn->tpg\n");
1085 goto new_sess_out;
1086 }
1087
1088 if (zero_tsih) {
1089 if (iscsi_login_zero_tsih_s2(conn) < 0) {
1090 iscsi_target_nego_release(login, conn);
1091 goto new_sess_out;
1092 }
1093 } else {
1094 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0) {
1095 iscsi_target_nego_release(login, conn);
1096 goto old_sess_out;
1097 }
1098 }
1099
1100 if (iscsi_target_start_negotiation(login, conn) < 0)
1101 goto new_sess_out;
1102
1103 if (!conn->sess) {
1104 pr_err("struct iscsi_conn session pointer is NULL!\n");
1105 goto new_sess_out;
1106 }
1107
1108 iscsi_stop_login_thread_timer(np);
1109
1110 if (signal_pending(current))
1111 goto new_sess_out;
1112
1113 ret = iscsi_post_login_handler(np, conn, zero_tsih);
1114
1115 if (ret < 0)
1116 goto new_sess_out;
1117
1118 iscsit_deaccess_np(np, tpg);
1119 tpg = NULL;
1120 /* Get another socket */
1121 return 1;
1122
1123 new_sess_out:
1124 pr_err("iSCSI Login negotiation failed.\n");
1125 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1126 ISCSI_LOGIN_STATUS_INIT_ERR);
1127 if (!zero_tsih || !conn->sess)
1128 goto old_sess_out;
1129 if (conn->sess->se_sess)
1130 transport_free_session(conn->sess->se_sess);
1131 if (conn->sess->session_index != 0) {
1132 spin_lock_bh(&sess_idr_lock);
1133 idr_remove(&sess_idr, conn->sess->session_index);
1134 spin_unlock_bh(&sess_idr_lock);
1135 }
1136 if (conn->sess->sess_ops)
1137 kfree(conn->sess->sess_ops);
1138 if (conn->sess)
1139 kfree(conn->sess);
1140 old_sess_out:
1141 iscsi_stop_login_thread_timer(np);
1142 /*
1143 * If login negotiation fails check if the Time2Retain timer
1144 * needs to be restarted.
1145 */
1146 if (!zero_tsih && conn->sess) {
1147 spin_lock_bh(&conn->sess->conn_lock);
1148 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1149 struct se_portal_group *se_tpg =
1150 &ISCSI_TPG_C(conn)->tpg_se_tpg;
1151
1152 atomic_set(&conn->sess->session_continuation, 0);
1153 spin_unlock_bh(&conn->sess->conn_lock);
1154 spin_lock_bh(&se_tpg->session_lock);
1155 iscsit_start_time2retain_handler(conn->sess);
1156 spin_unlock_bh(&se_tpg->session_lock);
1157 } else
1158 spin_unlock_bh(&conn->sess->conn_lock);
1159 iscsit_dec_session_usage_count(conn->sess);
1160 }
1161
1162 if (!IS_ERR(conn->conn_rx_hash.tfm))
1163 crypto_free_hash(conn->conn_rx_hash.tfm);
1164 if (!IS_ERR(conn->conn_tx_hash.tfm))
1165 crypto_free_hash(conn->conn_tx_hash.tfm);
1166
1167 if (conn->conn_cpumask)
1168 free_cpumask_var(conn->conn_cpumask);
1169
1170 kfree(conn->conn_ops);
1171
1172 if (conn->param_list) {
1173 iscsi_release_param_list(conn->param_list);
1174 conn->param_list = NULL;
1175 }
1176 if (conn->sock) {
1177 if (conn->conn_flags & CONNFLAG_SCTP_STRUCT_FILE) {
1178 kfree(conn->sock->file);
1179 conn->sock->file = NULL;
1180 }
1181 sock_release(conn->sock);
1182 }
1183 kfree(conn);
1184
1185 if (tpg) {
1186 iscsit_deaccess_np(np, tpg);
1187 tpg = NULL;
1188 }
1189
1190 out:
1191 stop = kthread_should_stop();
1192 if (!stop && signal_pending(current)) {
1193 spin_lock_bh(&np->np_thread_lock);
1194 stop = (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN);
1195 spin_unlock_bh(&np->np_thread_lock);
1196 }
1197 /* Wait for another socket.. */
1198 if (!stop)
1199 return 1;
1200
1201 iscsi_stop_login_thread_timer(np);
1202 spin_lock_bh(&np->np_thread_lock);
1203 np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1204 spin_unlock_bh(&np->np_thread_lock);
1205 return 0;
1206 }
1207
1208 int iscsi_target_login_thread(void *arg)
1209 {
1210 struct iscsi_np *np = arg;
1211 int ret;
1212
1213 allow_signal(SIGINT);
1214
1215 while (!kthread_should_stop()) {
1216 ret = __iscsi_target_login_thread(np);
1217 /*
1218 * We break and exit here unless another sock_accept() call
1219 * is expected.
1220 */
1221 if (ret != 1)
1222 break;
1223 }
1224
1225 return 0;
1226 }
Linux kernel - Deliverables
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