1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*******************************************************************************
3 * This file contains the login functions used by the iSCSI Target driver.
4 *
5 * (c) Copyright 2007-2013 Datera, Inc.
6 *
7 * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
8 *
9 ******************************************************************************/
10
11 #include <linux/module.h>
12 #include <linux/string.h>
13 #include <linux/kthread.h>
14 #include <linux/sched/signal.h>
15 #include <linux/idr.h>
16 #include <linux/tcp.h> /* TCP_NODELAY */
17 #include <net/ip.h>
18 #include <net/ipv6.h> /* ipv6_addr_v4mapped() */
19 #include <scsi/iscsi_proto.h>
20 #include <target/target_core_base.h>
21 #include <target/target_core_fabric.h>
22
23 #include <target/iscsi/iscsi_target_core.h>
24 #include <target/iscsi/iscsi_target_stat.h>
25 #include "iscsi_target_device.h"
26 #include "iscsi_target_nego.h"
27 #include "iscsi_target_erl0.h"
28 #include "iscsi_target_erl2.h"
29 #include "iscsi_target_login.h"
30 #include "iscsi_target_tpg.h"
31 #include "iscsi_target_util.h"
32 #include "iscsi_target.h"
33 #include "iscsi_target_parameters.h"
34
35 #include <target/iscsi/iscsi_transport.h>
36
iscsi_login_init_conn(struct iscsit_conn * conn)37 static struct iscsi_login *iscsi_login_init_conn(struct iscsit_conn *conn)
38 {
39 struct iscsi_login *login;
40
41 login = kzalloc(sizeof(struct iscsi_login), GFP_KERNEL);
42 if (!login) {
43 pr_err("Unable to allocate memory for struct iscsi_login.\n");
44 return NULL;
45 }
46 conn->login = login;
47 login->conn = conn;
48 login->first_request = 1;
49
50 login->req_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
51 if (!login->req_buf) {
52 pr_err("Unable to allocate memory for response buffer.\n");
53 goto out_login;
54 }
55
56 login->rsp_buf = kzalloc(MAX_KEY_VALUE_PAIRS, GFP_KERNEL);
57 if (!login->rsp_buf) {
58 pr_err("Unable to allocate memory for request buffer.\n");
59 goto out_req_buf;
60 }
61
62 conn->conn_login = login;
63
64 return login;
65
66 out_req_buf:
67 kfree(login->req_buf);
68 out_login:
69 kfree(login);
70 return NULL;
71 }
72
iscsi_login_check_initiator_version(struct iscsit_conn * conn,u8 version_max,u8 version_min)73 static int iscsi_login_check_initiator_version(
74 struct iscsit_conn *conn,
75 u8 version_max,
76 u8 version_min)
77 {
78 if ((version_max != 0x00) || (version_min != 0x00)) {
79 pr_err("Unsupported iSCSI IETF Pre-RFC Revision,"
80 " version Min/Max 0x%02x/0x%02x, rejecting login.\n",
81 version_min, version_max);
82 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
83 ISCSI_LOGIN_STATUS_NO_VERSION);
84 return -1;
85 }
86
87 return 0;
88 }
89
iscsi_check_for_session_reinstatement(struct iscsit_conn * conn)90 int iscsi_check_for_session_reinstatement(struct iscsit_conn *conn)
91 {
92 int sessiontype;
93 struct iscsi_param *initiatorname_param = NULL, *sessiontype_param = NULL;
94 struct iscsi_portal_group *tpg = conn->tpg;
95 struct iscsit_session *sess = NULL, *sess_p = NULL;
96 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
97 struct se_session *se_sess, *se_sess_tmp;
98
99 initiatorname_param = iscsi_find_param_from_key(
100 INITIATORNAME, conn->param_list);
101 sessiontype_param = iscsi_find_param_from_key(
102 SESSIONTYPE, conn->param_list);
103 if (!initiatorname_param || !sessiontype_param) {
104 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
105 ISCSI_LOGIN_STATUS_MISSING_FIELDS);
106 return -1;
107 }
108
109 sessiontype = (strncmp(sessiontype_param->value, NORMAL, 6)) ? 1 : 0;
110
111 spin_lock_bh(&se_tpg->session_lock);
112 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
113 sess_list) {
114
115 sess_p = se_sess->fabric_sess_ptr;
116 spin_lock(&sess_p->conn_lock);
117 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
118 atomic_read(&sess_p->session_logout) ||
119 atomic_read(&sess_p->session_close) ||
120 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
121 spin_unlock(&sess_p->conn_lock);
122 continue;
123 }
124 if (!memcmp(sess_p->isid, conn->sess->isid, 6) &&
125 (!strcmp(sess_p->sess_ops->InitiatorName,
126 initiatorname_param->value) &&
127 (sess_p->sess_ops->SessionType == sessiontype))) {
128 atomic_set(&sess_p->session_reinstatement, 1);
129 atomic_set(&sess_p->session_fall_back_to_erl0, 1);
130 atomic_set(&sess_p->session_close, 1);
131 spin_unlock(&sess_p->conn_lock);
132 iscsit_inc_session_usage_count(sess_p);
133 iscsit_stop_time2retain_timer(sess_p);
134 sess = sess_p;
135 break;
136 }
137 spin_unlock(&sess_p->conn_lock);
138 }
139 spin_unlock_bh(&se_tpg->session_lock);
140 /*
141 * If the Time2Retain handler has expired, the session is already gone.
142 */
143 if (!sess)
144 return 0;
145
146 pr_debug("%s iSCSI Session SID %u is still active for %s,"
147 " performing session reinstatement.\n", (sessiontype) ?
148 "Discovery" : "Normal", sess->sid,
149 sess->sess_ops->InitiatorName);
150
151 spin_lock_bh(&sess->conn_lock);
152 if (sess->session_state == TARG_SESS_STATE_FAILED) {
153 spin_unlock_bh(&sess->conn_lock);
154 iscsit_dec_session_usage_count(sess);
155 return 0;
156 }
157 spin_unlock_bh(&sess->conn_lock);
158
159 iscsit_stop_session(sess, 1, 1);
160 iscsit_dec_session_usage_count(sess);
161
162 return 0;
163 }
164
iscsi_login_set_conn_values(struct iscsit_session * sess,struct iscsit_conn * conn,__be16 cid)165 static int iscsi_login_set_conn_values(
166 struct iscsit_session *sess,
167 struct iscsit_conn *conn,
168 __be16 cid)
169 {
170 int ret;
171 conn->sess = sess;
172 conn->cid = be16_to_cpu(cid);
173 /*
174 * Generate a random Status sequence number (statsn) for the new
175 * iSCSI connection.
176 */
177 ret = get_random_bytes_wait(&conn->stat_sn, sizeof(u32));
178 if (unlikely(ret))
179 return ret;
180
181 mutex_lock(&auth_id_lock);
182 conn->auth_id = iscsit_global->auth_id++;
183 mutex_unlock(&auth_id_lock);
184 return 0;
185 }
186
iscsi_change_param_sprintf(struct iscsit_conn * conn,const char * fmt,...)187 __printf(2, 3) int iscsi_change_param_sprintf(
188 struct iscsit_conn *conn,
189 const char *fmt, ...)
190 {
191 va_list args;
192 unsigned char buf[64];
193
194 memset(buf, 0, sizeof buf);
195
196 va_start(args, fmt);
197 vsnprintf(buf, sizeof buf, fmt, args);
198 va_end(args);
199
200 if (iscsi_change_param_value(buf, conn->param_list, 0) < 0) {
201 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
202 ISCSI_LOGIN_STATUS_NO_RESOURCES);
203 return -1;
204 }
205
206 return 0;
207 }
208 EXPORT_SYMBOL(iscsi_change_param_sprintf);
209
210 /*
211 * This is the leading connection of a new session,
212 * or session reinstatement.
213 */
iscsi_login_zero_tsih_s1(struct iscsit_conn * conn,unsigned char * buf)214 static int iscsi_login_zero_tsih_s1(
215 struct iscsit_conn *conn,
216 unsigned char *buf)
217 {
218 struct iscsit_session *sess = NULL;
219 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
220 int ret;
221
222 sess = kzalloc(sizeof(struct iscsit_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 if (iscsi_login_set_conn_values(sess, conn, pdu->cid))
231 goto free_sess;
232
233 sess->init_task_tag = pdu->itt;
234 memcpy(&sess->isid, pdu->isid, 6);
235 sess->exp_cmd_sn = be32_to_cpu(pdu->cmdsn);
236 INIT_LIST_HEAD(&sess->sess_conn_list);
237 INIT_LIST_HEAD(&sess->sess_ooo_cmdsn_list);
238 INIT_LIST_HEAD(&sess->cr_active_list);
239 INIT_LIST_HEAD(&sess->cr_inactive_list);
240 init_completion(&sess->async_msg_comp);
241 init_completion(&sess->reinstatement_comp);
242 init_completion(&sess->session_wait_comp);
243 init_completion(&sess->session_waiting_on_uc_comp);
244 mutex_init(&sess->cmdsn_mutex);
245 spin_lock_init(&sess->conn_lock);
246 spin_lock_init(&sess->cr_a_lock);
247 spin_lock_init(&sess->cr_i_lock);
248 spin_lock_init(&sess->session_usage_lock);
249 spin_lock_init(&sess->ttt_lock);
250
251 timer_setup(&sess->time2retain_timer,
252 iscsit_handle_time2retain_timeout, 0);
253
254 ret = ida_alloc(&sess_ida, GFP_KERNEL);
255 if (ret < 0) {
256 pr_err("Session ID allocation failed %d\n", ret);
257 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
258 ISCSI_LOGIN_STATUS_NO_RESOURCES);
259 goto free_sess;
260 }
261
262 sess->session_index = ret;
263 sess->creation_time = get_jiffies_64();
264 /*
265 * The FFP CmdSN window values will be allocated from the TPG's
266 * Initiator Node's ACL once the login has been successfully completed.
267 */
268 atomic_set(&sess->max_cmd_sn, be32_to_cpu(pdu->cmdsn));
269
270 sess->sess_ops = kzalloc(sizeof(struct iscsi_sess_ops), GFP_KERNEL);
271 if (!sess->sess_ops) {
272 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
273 ISCSI_LOGIN_STATUS_NO_RESOURCES);
274 pr_err("Unable to allocate memory for"
275 " struct iscsi_sess_ops.\n");
276 goto free_id;
277 }
278
279 sess->se_sess = transport_alloc_session(TARGET_PROT_NORMAL);
280 if (IS_ERR(sess->se_sess)) {
281 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
282 ISCSI_LOGIN_STATUS_NO_RESOURCES);
283 goto free_ops;
284 }
285
286 return 0;
287
288 free_ops:
289 kfree(sess->sess_ops);
290 free_id:
291 ida_free(&sess_ida, sess->session_index);
292 free_sess:
293 kfree(sess);
294 conn->sess = NULL;
295 return -ENOMEM;
296 }
297
iscsi_login_zero_tsih_s2(struct iscsit_conn * conn)298 static int iscsi_login_zero_tsih_s2(
299 struct iscsit_conn *conn)
300 {
301 struct iscsi_node_attrib *na;
302 struct iscsit_session *sess = conn->sess;
303 struct iscsi_param *param;
304 bool iser = false;
305
306 sess->tpg = conn->tpg;
307
308 /*
309 * Assign a new TPG Session Handle. Note this is protected with
310 * struct iscsi_portal_group->np_login_sem from iscsit_access_np().
311 */
312 sess->tsih = ++sess->tpg->ntsih;
313 if (!sess->tsih)
314 sess->tsih = ++sess->tpg->ntsih;
315
316 /*
317 * Create the default params from user defined values..
318 */
319 if (iscsi_copy_param_list(&conn->param_list,
320 conn->tpg->param_list, 1) < 0) {
321 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
322 ISCSI_LOGIN_STATUS_NO_RESOURCES);
323 return -1;
324 }
325
326 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
327 iser = true;
328
329 iscsi_set_keys_to_negotiate(conn->param_list, iser);
330
331 if (sess->sess_ops->SessionType)
332 return iscsi_set_keys_irrelevant_for_discovery(
333 conn->param_list);
334
335 na = iscsit_tpg_get_node_attrib(sess);
336
337 /*
338 * If ACL allows non-authorized access in TPG with CHAP,
339 * then set None to AuthMethod.
340 */
341 param = iscsi_find_param_from_key(AUTHMETHOD, conn->param_list);
342 if (param && !strstr(param->value, NONE)) {
343 if (!iscsi_conn_auth_required(conn))
344 if (iscsi_change_param_sprintf(conn, "AuthMethod=%s",
345 NONE))
346 return -1;
347 }
348
349 /*
350 * Need to send TargetPortalGroupTag back in first login response
351 * on any iSCSI connection where the Initiator provides TargetName.
352 * See 5.3.1. Login Phase Start
353 *
354 * In our case, we have already located the struct iscsi_tiqn at this point.
355 */
356 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
357 return -1;
358
359 /*
360 * Workaround for Initiators that have broken connection recovery logic.
361 *
362 * "We would really like to get rid of this." Linux-iSCSI.org team
363 */
364 if (iscsi_change_param_sprintf(conn, "ErrorRecoveryLevel=%d", na->default_erl))
365 return -1;
366
367 /*
368 * Set RDMAExtensions=Yes by default for iSER enabled network portals
369 */
370 if (iser) {
371 struct iscsi_param *param;
372 unsigned long mrdsl, off;
373 int rc;
374
375 if (iscsi_change_param_sprintf(conn, "RDMAExtensions=Yes"))
376 return -1;
377
378 /*
379 * Make MaxRecvDataSegmentLength PAGE_SIZE aligned for
380 * Immediate Data + Unsolicited Data-OUT if necessary..
381 */
382 param = iscsi_find_param_from_key("MaxRecvDataSegmentLength",
383 conn->param_list);
384 if (!param) {
385 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
386 ISCSI_LOGIN_STATUS_NO_RESOURCES);
387 return -1;
388 }
389 rc = kstrtoul(param->value, 0, &mrdsl);
390 if (rc < 0) {
391 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
392 ISCSI_LOGIN_STATUS_NO_RESOURCES);
393 return -1;
394 }
395 off = mrdsl % PAGE_SIZE;
396 if (!off)
397 goto check_prot;
398
399 if (mrdsl < PAGE_SIZE)
400 mrdsl = PAGE_SIZE;
401 else
402 mrdsl -= off;
403
404 pr_warn("Aligning ISER MaxRecvDataSegmentLength: %lu down"
405 " to PAGE_SIZE\n", mrdsl);
406
407 if (iscsi_change_param_sprintf(conn, "MaxRecvDataSegmentLength=%lu\n", mrdsl))
408 return -1;
409 /*
410 * ISER currently requires that ImmediateData + Unsolicited
411 * Data be disabled when protection / signature MRs are enabled.
412 */
413 check_prot:
414 if (sess->se_sess->sup_prot_ops &
415 (TARGET_PROT_DOUT_STRIP | TARGET_PROT_DOUT_PASS |
416 TARGET_PROT_DOUT_INSERT)) {
417
418 if (iscsi_change_param_sprintf(conn, "ImmediateData=No"))
419 return -1;
420
421 if (iscsi_change_param_sprintf(conn, "InitialR2T=Yes"))
422 return -1;
423
424 pr_debug("Forcing ImmediateData=No + InitialR2T=Yes for"
425 " T10-PI enabled ISER session\n");
426 }
427 }
428
429 return 0;
430 }
431
iscsi_login_non_zero_tsih_s1(struct iscsit_conn * conn,unsigned char * buf)432 static int iscsi_login_non_zero_tsih_s1(
433 struct iscsit_conn *conn,
434 unsigned char *buf)
435 {
436 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
437
438 return iscsi_login_set_conn_values(NULL, conn, pdu->cid);
439 }
440
441 /*
442 * Add a new connection to an existing session.
443 */
iscsi_login_non_zero_tsih_s2(struct iscsit_conn * conn,unsigned char * buf)444 static int iscsi_login_non_zero_tsih_s2(
445 struct iscsit_conn *conn,
446 unsigned char *buf)
447 {
448 struct iscsi_portal_group *tpg = conn->tpg;
449 struct iscsit_session *sess = NULL, *sess_p = NULL;
450 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
451 struct se_session *se_sess, *se_sess_tmp;
452 struct iscsi_login_req *pdu = (struct iscsi_login_req *)buf;
453 bool iser = false;
454
455 spin_lock_bh(&se_tpg->session_lock);
456 list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
457 sess_list) {
458
459 sess_p = (struct iscsit_session *)se_sess->fabric_sess_ptr;
460 if (atomic_read(&sess_p->session_fall_back_to_erl0) ||
461 atomic_read(&sess_p->session_logout) ||
462 atomic_read(&sess_p->session_close) ||
463 (sess_p->time2retain_timer_flags & ISCSI_TF_EXPIRED))
464 continue;
465 if (!memcmp(sess_p->isid, pdu->isid, 6) &&
466 (sess_p->tsih == be16_to_cpu(pdu->tsih))) {
467 iscsit_inc_session_usage_count(sess_p);
468 iscsit_stop_time2retain_timer(sess_p);
469 sess = sess_p;
470 break;
471 }
472 }
473 spin_unlock_bh(&se_tpg->session_lock);
474
475 /*
476 * If the Time2Retain handler has expired, the session is already gone.
477 */
478 if (!sess) {
479 pr_err("Initiator attempting to add a connection to"
480 " a non-existent session, rejecting iSCSI Login.\n");
481 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
482 ISCSI_LOGIN_STATUS_NO_SESSION);
483 return -1;
484 }
485
486 /*
487 * Stop the Time2Retain timer if this is a failed session, we restart
488 * the timer if the login is not successful.
489 */
490 spin_lock_bh(&sess->conn_lock);
491 if (sess->session_state == TARG_SESS_STATE_FAILED)
492 atomic_set(&sess->session_continuation, 1);
493 spin_unlock_bh(&sess->conn_lock);
494
495 if (iscsi_login_set_conn_values(sess, conn, pdu->cid) < 0 ||
496 iscsi_copy_param_list(&conn->param_list,
497 conn->tpg->param_list, 0) < 0) {
498 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
499 ISCSI_LOGIN_STATUS_NO_RESOURCES);
500 return -1;
501 }
502
503 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
504 iser = true;
505
506 iscsi_set_keys_to_negotiate(conn->param_list, iser);
507 /*
508 * Need to send TargetPortalGroupTag back in first login response
509 * on any iSCSI connection where the Initiator provides TargetName.
510 * See 5.3.1. Login Phase Start
511 *
512 * In our case, we have already located the struct iscsi_tiqn at this point.
513 */
514 if (iscsi_change_param_sprintf(conn, "TargetPortalGroupTag=%hu", sess->tpg->tpgt))
515 return -1;
516
517 return 0;
518 }
519
iscsi_login_post_auth_non_zero_tsih(struct iscsit_conn * conn,u16 cid,u32 exp_statsn)520 int iscsi_login_post_auth_non_zero_tsih(
521 struct iscsit_conn *conn,
522 u16 cid,
523 u32 exp_statsn)
524 {
525 struct iscsit_conn *conn_ptr = NULL;
526 struct iscsi_conn_recovery *cr = NULL;
527 struct iscsit_session *sess = conn->sess;
528
529 /*
530 * By following item 5 in the login table, if we have found
531 * an existing ISID and a valid/existing TSIH and an existing
532 * CID we do connection reinstatement. Currently we dont not
533 * support it so we send back an non-zero status class to the
534 * initiator and release the new connection.
535 */
536 conn_ptr = iscsit_get_conn_from_cid_rcfr(sess, cid);
537 if (conn_ptr) {
538 pr_err("Connection exists with CID %hu for %s,"
539 " performing connection reinstatement.\n",
540 conn_ptr->cid, sess->sess_ops->InitiatorName);
541
542 iscsit_connection_reinstatement_rcfr(conn_ptr);
543 iscsit_dec_conn_usage_count(conn_ptr);
544 }
545
546 /*
547 * Check for any connection recovery entries containing CID.
548 * We use the original ExpStatSN sent in the first login request
549 * to acknowledge commands for the failed connection.
550 *
551 * Also note that an explict logout may have already been sent,
552 * but the response may not be sent due to additional connection
553 * loss.
554 */
555 if (sess->sess_ops->ErrorRecoveryLevel == 2) {
556 cr = iscsit_get_inactive_connection_recovery_entry(
557 sess, cid);
558 if (cr) {
559 pr_debug("Performing implicit logout"
560 " for connection recovery on CID: %hu\n",
561 conn->cid);
562 iscsit_discard_cr_cmds_by_expstatsn(cr, exp_statsn);
563 }
564 }
565
566 /*
567 * Else we follow item 4 from the login table in that we have
568 * found an existing ISID and a valid/existing TSIH and a new
569 * CID we go ahead and continue to add a new connection to the
570 * session.
571 */
572 pr_debug("Adding CID %hu to existing session for %s.\n",
573 cid, sess->sess_ops->InitiatorName);
574
575 if ((atomic_read(&sess->nconn) + 1) > sess->sess_ops->MaxConnections) {
576 pr_err("Adding additional connection to this session"
577 " would exceed MaxConnections %d, login failed.\n",
578 sess->sess_ops->MaxConnections);
579 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
580 ISCSI_LOGIN_STATUS_ISID_ERROR);
581 return -1;
582 }
583
584 return 0;
585 }
586
iscsi_post_login_start_timers(struct iscsit_conn * conn)587 static void iscsi_post_login_start_timers(struct iscsit_conn *conn)
588 {
589 struct iscsit_session *sess = conn->sess;
590 /*
591 * FIXME: Unsolicited NopIN support for ISER
592 */
593 if (conn->conn_transport->transport_type == ISCSI_INFINIBAND)
594 return;
595
596 if (!sess->sess_ops->SessionType)
597 iscsit_start_nopin_timer(conn);
598 }
599
iscsit_start_kthreads(struct iscsit_conn * conn)600 int iscsit_start_kthreads(struct iscsit_conn *conn)
601 {
602 int ret = 0;
603
604 spin_lock(&iscsit_global->ts_bitmap_lock);
605 conn->bitmap_id = bitmap_find_free_region(iscsit_global->ts_bitmap,
606 ISCSIT_BITMAP_BITS, get_order(1));
607 spin_unlock(&iscsit_global->ts_bitmap_lock);
608
609 if (conn->bitmap_id < 0) {
610 pr_err("bitmap_find_free_region() failed for"
611 " iscsit_start_kthreads()\n");
612 return -ENOMEM;
613 }
614
615 conn->tx_thread = kthread_run(iscsi_target_tx_thread, conn,
616 "%s", ISCSI_TX_THREAD_NAME);
617 if (IS_ERR(conn->tx_thread)) {
618 pr_err("Unable to start iscsi_target_tx_thread\n");
619 ret = PTR_ERR(conn->tx_thread);
620 goto out_bitmap;
621 }
622 conn->tx_thread_active = true;
623
624 conn->rx_thread = kthread_run(iscsi_target_rx_thread, conn,
625 "%s", ISCSI_RX_THREAD_NAME);
626 if (IS_ERR(conn->rx_thread)) {
627 pr_err("Unable to start iscsi_target_rx_thread\n");
628 ret = PTR_ERR(conn->rx_thread);
629 goto out_tx;
630 }
631 conn->rx_thread_active = true;
632
633 return 0;
634 out_tx:
635 send_sig(SIGINT, conn->tx_thread, 1);
636 kthread_stop(conn->tx_thread);
637 conn->tx_thread_active = false;
638 out_bitmap:
639 spin_lock(&iscsit_global->ts_bitmap_lock);
640 bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
641 get_order(1));
642 spin_unlock(&iscsit_global->ts_bitmap_lock);
643 return ret;
644 }
645
iscsi_post_login_handler(struct iscsi_np * np,struct iscsit_conn * conn,u8 zero_tsih)646 void iscsi_post_login_handler(
647 struct iscsi_np *np,
648 struct iscsit_conn *conn,
649 u8 zero_tsih)
650 {
651 int stop_timer = 0;
652 struct iscsit_session *sess = conn->sess;
653 struct se_session *se_sess = sess->se_sess;
654 struct iscsi_portal_group *tpg = sess->tpg;
655 struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
656
657 iscsit_inc_conn_usage_count(conn);
658
659 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_SUCCESS,
660 ISCSI_LOGIN_STATUS_ACCEPT);
661
662 pr_debug("Moving to TARG_CONN_STATE_LOGGED_IN.\n");
663 conn->conn_state = TARG_CONN_STATE_LOGGED_IN;
664
665 iscsi_set_connection_parameters(conn->conn_ops, conn->param_list);
666 /*
667 * SCSI Initiator -> SCSI Target Port Mapping
668 */
669 if (!zero_tsih) {
670 iscsi_set_session_parameters(sess->sess_ops,
671 conn->param_list, 0);
672 iscsi_release_param_list(conn->param_list);
673 conn->param_list = NULL;
674
675 spin_lock_bh(&sess->conn_lock);
676 atomic_set(&sess->session_continuation, 0);
677 if (sess->session_state == TARG_SESS_STATE_FAILED) {
678 pr_debug("Moving to"
679 " TARG_SESS_STATE_LOGGED_IN.\n");
680 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
681 stop_timer = 1;
682 }
683
684 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to"
685 " %pISpc,%hu\n", conn->cid, &conn->login_sockaddr,
686 &conn->local_sockaddr, tpg->tpgt);
687
688 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
689 atomic_inc(&sess->nconn);
690 pr_debug("Incremented iSCSI Connection count to %d"
691 " from node: %s\n", atomic_read(&sess->nconn),
692 sess->sess_ops->InitiatorName);
693 spin_unlock_bh(&sess->conn_lock);
694
695 iscsi_post_login_start_timers(conn);
696 /*
697 * Determine CPU mask to ensure connection's RX and TX kthreads
698 * are scheduled on the same CPU.
699 */
700 iscsit_thread_get_cpumask(conn);
701 conn->conn_rx_reset_cpumask = 1;
702 conn->conn_tx_reset_cpumask = 1;
703 /*
704 * Wakeup the sleeping iscsi_target_rx_thread() now that
705 * iscsit_conn is in TARG_CONN_STATE_LOGGED_IN state.
706 */
707 complete(&conn->rx_login_comp);
708 iscsit_dec_conn_usage_count(conn);
709
710 if (stop_timer) {
711 spin_lock_bh(&se_tpg->session_lock);
712 iscsit_stop_time2retain_timer(sess);
713 spin_unlock_bh(&se_tpg->session_lock);
714 }
715 iscsit_dec_session_usage_count(sess);
716 return;
717 }
718
719 iscsi_set_session_parameters(sess->sess_ops, conn->param_list, 1);
720 iscsi_release_param_list(conn->param_list);
721 conn->param_list = NULL;
722
723 iscsit_determine_maxcmdsn(sess);
724
725 spin_lock_bh(&se_tpg->session_lock);
726 __transport_register_session(&sess->tpg->tpg_se_tpg,
727 se_sess->se_node_acl, se_sess, sess);
728 pr_debug("Moving to TARG_SESS_STATE_LOGGED_IN.\n");
729 sess->session_state = TARG_SESS_STATE_LOGGED_IN;
730
731 pr_debug("iSCSI Login successful on CID: %hu from %pISpc to %pISpc,%hu\n",
732 conn->cid, &conn->login_sockaddr, &conn->local_sockaddr,
733 tpg->tpgt);
734
735 spin_lock_bh(&sess->conn_lock);
736 list_add_tail(&conn->conn_list, &sess->sess_conn_list);
737 atomic_inc(&sess->nconn);
738 pr_debug("Incremented iSCSI Connection count to %d from node:"
739 " %s\n", atomic_read(&sess->nconn),
740 sess->sess_ops->InitiatorName);
741 spin_unlock_bh(&sess->conn_lock);
742
743 sess->sid = tpg->sid++;
744 if (!sess->sid)
745 sess->sid = tpg->sid++;
746 pr_debug("Established iSCSI session from node: %s\n",
747 sess->sess_ops->InitiatorName);
748
749 tpg->nsessions++;
750 if (tpg->tpg_tiqn)
751 tpg->tpg_tiqn->tiqn_nsessions++;
752
753 pr_debug("Incremented number of active iSCSI sessions to %u on"
754 " iSCSI Target Portal Group: %hu\n", tpg->nsessions, tpg->tpgt);
755 spin_unlock_bh(&se_tpg->session_lock);
756
757 iscsi_post_login_start_timers(conn);
758 /*
759 * Determine CPU mask to ensure connection's RX and TX kthreads
760 * are scheduled on the same CPU.
761 */
762 iscsit_thread_get_cpumask(conn);
763 conn->conn_rx_reset_cpumask = 1;
764 conn->conn_tx_reset_cpumask = 1;
765 /*
766 * Wakeup the sleeping iscsi_target_rx_thread() now that
767 * iscsit_conn is in TARG_CONN_STATE_LOGGED_IN state.
768 */
769 complete(&conn->rx_login_comp);
770 iscsit_dec_conn_usage_count(conn);
771 }
772
iscsit_setup_np(struct iscsi_np * np,struct sockaddr_storage * sockaddr)773 int iscsit_setup_np(
774 struct iscsi_np *np,
775 struct sockaddr_storage *sockaddr)
776 {
777 struct socket *sock = NULL;
778 int backlog = ISCSIT_TCP_BACKLOG, ret, len;
779
780 switch (np->np_network_transport) {
781 case ISCSI_TCP:
782 np->np_ip_proto = IPPROTO_TCP;
783 np->np_sock_type = SOCK_STREAM;
784 break;
785 case ISCSI_SCTP_TCP:
786 np->np_ip_proto = IPPROTO_SCTP;
787 np->np_sock_type = SOCK_STREAM;
788 break;
789 case ISCSI_SCTP_UDP:
790 np->np_ip_proto = IPPROTO_SCTP;
791 np->np_sock_type = SOCK_SEQPACKET;
792 break;
793 default:
794 pr_err("Unsupported network_transport: %d\n",
795 np->np_network_transport);
796 return -EINVAL;
797 }
798
799 ret = sock_create(sockaddr->ss_family, np->np_sock_type,
800 np->np_ip_proto, &sock);
801 if (ret < 0) {
802 pr_err("sock_create() failed.\n");
803 return ret;
804 }
805 np->np_socket = sock;
806 /*
807 * Setup the np->np_sockaddr from the passed sockaddr setup
808 * in iscsi_target_configfs.c code..
809 */
810 memcpy(&np->np_sockaddr, sockaddr,
811 sizeof(struct sockaddr_storage));
812
813 if (sockaddr->ss_family == AF_INET6)
814 len = sizeof(struct sockaddr_in6);
815 else
816 len = sizeof(struct sockaddr_in);
817 /*
818 * Set SO_REUSEADDR, and disable Nagle Algorithm with TCP_NODELAY.
819 */
820 if (np->np_network_transport == ISCSI_TCP)
821 tcp_sock_set_nodelay(sock->sk);
822 sock_set_reuseaddr(sock->sk);
823 ip_sock_set_freebind(sock->sk);
824
825 ret = kernel_bind(sock, (struct sockaddr *)&np->np_sockaddr, len);
826 if (ret < 0) {
827 pr_err("kernel_bind() failed: %d\n", ret);
828 goto fail;
829 }
830
831 ret = kernel_listen(sock, backlog);
832 if (ret != 0) {
833 pr_err("kernel_listen() failed: %d\n", ret);
834 goto fail;
835 }
836
837 return 0;
838 fail:
839 np->np_socket = NULL;
840 sock_release(sock);
841 return ret;
842 }
843
iscsi_target_setup_login_socket(struct iscsi_np * np,struct sockaddr_storage * sockaddr)844 int iscsi_target_setup_login_socket(
845 struct iscsi_np *np,
846 struct sockaddr_storage *sockaddr)
847 {
848 struct iscsit_transport *t;
849 int rc;
850
851 t = iscsit_get_transport(np->np_network_transport);
852 if (!t)
853 return -EINVAL;
854
855 rc = t->iscsit_setup_np(np, sockaddr);
856 if (rc < 0) {
857 iscsit_put_transport(t);
858 return rc;
859 }
860
861 np->np_transport = t;
862 np->enabled = true;
863 return 0;
864 }
865
iscsit_accept_np(struct iscsi_np * np,struct iscsit_conn * conn)866 int iscsit_accept_np(struct iscsi_np *np, struct iscsit_conn *conn)
867 {
868 struct socket *new_sock, *sock = np->np_socket;
869 struct sockaddr_in sock_in;
870 struct sockaddr_in6 sock_in6;
871 int rc;
872
873 rc = kernel_accept(sock, &new_sock, 0);
874 if (rc < 0)
875 return rc;
876
877 conn->sock = new_sock;
878 conn->login_family = np->np_sockaddr.ss_family;
879
880 if (np->np_sockaddr.ss_family == AF_INET6) {
881 memset(&sock_in6, 0, sizeof(struct sockaddr_in6));
882
883 rc = conn->sock->ops->getname(conn->sock,
884 (struct sockaddr *)&sock_in6, 1);
885 if (rc >= 0) {
886 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
887 memcpy(&conn->login_sockaddr, &sock_in6, sizeof(sock_in6));
888 } else {
889 /* Pretend to be an ipv4 socket */
890 sock_in.sin_family = AF_INET;
891 sock_in.sin_port = sock_in6.sin6_port;
892 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
893 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
894 }
895 }
896
897 rc = conn->sock->ops->getname(conn->sock,
898 (struct sockaddr *)&sock_in6, 0);
899 if (rc >= 0) {
900 if (!ipv6_addr_v4mapped(&sock_in6.sin6_addr)) {
901 memcpy(&conn->local_sockaddr, &sock_in6, sizeof(sock_in6));
902 } else {
903 /* Pretend to be an ipv4 socket */
904 sock_in.sin_family = AF_INET;
905 sock_in.sin_port = sock_in6.sin6_port;
906 memcpy(&sock_in.sin_addr, &sock_in6.sin6_addr.s6_addr32[3], 4);
907 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
908 }
909 }
910 } else {
911 memset(&sock_in, 0, sizeof(struct sockaddr_in));
912
913 rc = conn->sock->ops->getname(conn->sock,
914 (struct sockaddr *)&sock_in, 1);
915 if (rc >= 0)
916 memcpy(&conn->login_sockaddr, &sock_in, sizeof(sock_in));
917
918 rc = conn->sock->ops->getname(conn->sock,
919 (struct sockaddr *)&sock_in, 0);
920 if (rc >= 0)
921 memcpy(&conn->local_sockaddr, &sock_in, sizeof(sock_in));
922 }
923
924 return 0;
925 }
926
iscsit_get_login_rx(struct iscsit_conn * conn,struct iscsi_login * login)927 int iscsit_get_login_rx(struct iscsit_conn *conn, struct iscsi_login *login)
928 {
929 struct iscsi_login_req *login_req;
930 u32 padding = 0, payload_length;
931
932 if (iscsi_login_rx_data(conn, login->req, ISCSI_HDR_LEN) < 0)
933 return -1;
934
935 login_req = (struct iscsi_login_req *)login->req;
936 payload_length = ntoh24(login_req->dlength);
937 padding = ((-payload_length) & 3);
938
939 pr_debug("Got Login Command, Flags 0x%02x, ITT: 0x%08x,"
940 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, CID: %hu, Length: %u\n",
941 login_req->flags, login_req->itt, login_req->cmdsn,
942 login_req->exp_statsn, login_req->cid, payload_length);
943 /*
944 * Setup the initial iscsi_login values from the leading
945 * login request PDU.
946 */
947 if (login->first_request) {
948 login_req = (struct iscsi_login_req *)login->req;
949 login->leading_connection = (!login_req->tsih) ? 1 : 0;
950 login->current_stage = ISCSI_LOGIN_CURRENT_STAGE(login_req->flags);
951 login->version_min = login_req->min_version;
952 login->version_max = login_req->max_version;
953 memcpy(login->isid, login_req->isid, 6);
954 login->cmd_sn = be32_to_cpu(login_req->cmdsn);
955 login->init_task_tag = login_req->itt;
956 login->initial_exp_statsn = be32_to_cpu(login_req->exp_statsn);
957 login->cid = be16_to_cpu(login_req->cid);
958 login->tsih = be16_to_cpu(login_req->tsih);
959 }
960
961 if (iscsi_target_check_login_request(conn, login) < 0)
962 return -1;
963
964 memset(login->req_buf, 0, MAX_KEY_VALUE_PAIRS);
965 if (iscsi_login_rx_data(conn, login->req_buf,
966 payload_length + padding) < 0)
967 return -1;
968
969 return 0;
970 }
971
iscsit_put_login_tx(struct iscsit_conn * conn,struct iscsi_login * login,u32 length)972 int iscsit_put_login_tx(struct iscsit_conn *conn, struct iscsi_login *login,
973 u32 length)
974 {
975 if (iscsi_login_tx_data(conn, login->rsp, login->rsp_buf, length) < 0)
976 return -1;
977
978 return 0;
979 }
980
981 static int
iscsit_conn_set_transport(struct iscsit_conn * conn,struct iscsit_transport * t)982 iscsit_conn_set_transport(struct iscsit_conn *conn, struct iscsit_transport *t)
983 {
984 int rc;
985
986 if (!t->owner) {
987 conn->conn_transport = t;
988 return 0;
989 }
990
991 rc = try_module_get(t->owner);
992 if (!rc) {
993 pr_err("try_module_get() failed for %s\n", t->name);
994 return -EINVAL;
995 }
996
997 conn->conn_transport = t;
998 return 0;
999 }
1000
iscsit_alloc_conn(struct iscsi_np * np)1001 static struct iscsit_conn *iscsit_alloc_conn(struct iscsi_np *np)
1002 {
1003 struct iscsit_conn *conn;
1004
1005 conn = kzalloc(sizeof(struct iscsit_conn), GFP_KERNEL);
1006 if (!conn) {
1007 pr_err("Could not allocate memory for new connection\n");
1008 return NULL;
1009 }
1010 pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
1011 conn->conn_state = TARG_CONN_STATE_FREE;
1012
1013 init_waitqueue_head(&conn->queues_wq);
1014 INIT_LIST_HEAD(&conn->conn_list);
1015 INIT_LIST_HEAD(&conn->conn_cmd_list);
1016 INIT_LIST_HEAD(&conn->immed_queue_list);
1017 INIT_LIST_HEAD(&conn->response_queue_list);
1018 init_completion(&conn->conn_post_wait_comp);
1019 init_completion(&conn->conn_wait_comp);
1020 init_completion(&conn->conn_wait_rcfr_comp);
1021 init_completion(&conn->conn_waiting_on_uc_comp);
1022 init_completion(&conn->conn_logout_comp);
1023 init_completion(&conn->rx_half_close_comp);
1024 init_completion(&conn->tx_half_close_comp);
1025 init_completion(&conn->rx_login_comp);
1026 spin_lock_init(&conn->cmd_lock);
1027 spin_lock_init(&conn->conn_usage_lock);
1028 spin_lock_init(&conn->immed_queue_lock);
1029 spin_lock_init(&conn->nopin_timer_lock);
1030 spin_lock_init(&conn->response_queue_lock);
1031 spin_lock_init(&conn->state_lock);
1032 spin_lock_init(&conn->login_worker_lock);
1033 spin_lock_init(&conn->login_timer_lock);
1034
1035 timer_setup(&conn->nopin_response_timer,
1036 iscsit_handle_nopin_response_timeout, 0);
1037 timer_setup(&conn->nopin_timer, iscsit_handle_nopin_timeout, 0);
1038 timer_setup(&conn->login_timer, iscsit_login_timeout, 0);
1039
1040 if (iscsit_conn_set_transport(conn, np->np_transport) < 0)
1041 goto free_conn;
1042
1043 conn->conn_ops = kzalloc(sizeof(struct iscsi_conn_ops), GFP_KERNEL);
1044 if (!conn->conn_ops) {
1045 pr_err("Unable to allocate memory for struct iscsi_conn_ops.\n");
1046 goto put_transport;
1047 }
1048
1049 if (!zalloc_cpumask_var(&conn->conn_cpumask, GFP_KERNEL)) {
1050 pr_err("Unable to allocate conn->conn_cpumask\n");
1051 goto free_conn_ops;
1052 }
1053
1054 if (!zalloc_cpumask_var(&conn->allowed_cpumask, GFP_KERNEL)) {
1055 pr_err("Unable to allocate conn->allowed_cpumask\n");
1056 goto free_conn_cpumask;
1057 }
1058
1059 conn->cmd_cnt = target_alloc_cmd_counter();
1060 if (!conn->cmd_cnt)
1061 goto free_conn_allowed_cpumask;
1062
1063 return conn;
1064
1065 free_conn_allowed_cpumask:
1066 free_cpumask_var(conn->allowed_cpumask);
1067 free_conn_cpumask:
1068 free_cpumask_var(conn->conn_cpumask);
1069 free_conn_ops:
1070 kfree(conn->conn_ops);
1071 put_transport:
1072 iscsit_put_transport(conn->conn_transport);
1073 free_conn:
1074 kfree(conn);
1075 return NULL;
1076 }
1077
iscsit_free_conn(struct iscsit_conn * conn)1078 void iscsit_free_conn(struct iscsit_conn *conn)
1079 {
1080 target_free_cmd_counter(conn->cmd_cnt);
1081 free_cpumask_var(conn->allowed_cpumask);
1082 free_cpumask_var(conn->conn_cpumask);
1083 kfree(conn->conn_ops);
1084 iscsit_put_transport(conn->conn_transport);
1085 kfree(conn);
1086 }
1087
iscsi_target_login_sess_out(struct iscsit_conn * conn,bool zero_tsih,bool new_sess)1088 void iscsi_target_login_sess_out(struct iscsit_conn *conn,
1089 bool zero_tsih, bool new_sess)
1090 {
1091 if (!new_sess)
1092 goto old_sess_out;
1093
1094 pr_err("iSCSI Login negotiation failed.\n");
1095 iscsit_collect_login_stats(conn, ISCSI_STATUS_CLS_INITIATOR_ERR,
1096 ISCSI_LOGIN_STATUS_INIT_ERR);
1097 if (!zero_tsih || !conn->sess)
1098 goto old_sess_out;
1099
1100 transport_free_session(conn->sess->se_sess);
1101 ida_free(&sess_ida, conn->sess->session_index);
1102 kfree(conn->sess->sess_ops);
1103 kfree(conn->sess);
1104 conn->sess = NULL;
1105
1106 old_sess_out:
1107 /*
1108 * If login negotiation fails check if the Time2Retain timer
1109 * needs to be restarted.
1110 */
1111 if (!zero_tsih && conn->sess) {
1112 spin_lock_bh(&conn->sess->conn_lock);
1113 if (conn->sess->session_state == TARG_SESS_STATE_FAILED) {
1114 struct se_portal_group *se_tpg =
1115 &conn->tpg->tpg_se_tpg;
1116
1117 atomic_set(&conn->sess->session_continuation, 0);
1118 spin_unlock_bh(&conn->sess->conn_lock);
1119 spin_lock_bh(&se_tpg->session_lock);
1120 iscsit_start_time2retain_handler(conn->sess);
1121 spin_unlock_bh(&se_tpg->session_lock);
1122 } else
1123 spin_unlock_bh(&conn->sess->conn_lock);
1124 iscsit_dec_session_usage_count(conn->sess);
1125 }
1126
1127 if (conn->param_list) {
1128 iscsi_release_param_list(conn->param_list);
1129 conn->param_list = NULL;
1130 }
1131 iscsi_target_nego_release(conn);
1132
1133 if (conn->sock) {
1134 sock_release(conn->sock);
1135 conn->sock = NULL;
1136 }
1137
1138 if (conn->conn_transport->iscsit_wait_conn)
1139 conn->conn_transport->iscsit_wait_conn(conn);
1140
1141 if (conn->conn_transport->iscsit_free_conn)
1142 conn->conn_transport->iscsit_free_conn(conn);
1143
1144 iscsit_free_conn(conn);
1145 }
1146
__iscsi_target_login_thread(struct iscsi_np * np)1147 static int __iscsi_target_login_thread(struct iscsi_np *np)
1148 {
1149 u8 *buffer, zero_tsih = 0;
1150 int ret = 0, rc;
1151 struct iscsit_conn *conn = NULL;
1152 struct iscsi_login *login;
1153 struct iscsi_portal_group *tpg = NULL;
1154 struct iscsi_login_req *pdu;
1155 struct iscsi_tpg_np *tpg_np;
1156 bool new_sess = false;
1157
1158 flush_signals(current);
1159
1160 spin_lock_bh(&np->np_thread_lock);
1161 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1162 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1163 spin_unlock_bh(&np->np_thread_lock);
1164 complete(&np->np_restart_comp);
1165 return 1;
1166 } else if (np->np_thread_state == ISCSI_NP_THREAD_SHUTDOWN) {
1167 spin_unlock_bh(&np->np_thread_lock);
1168 goto exit;
1169 } else {
1170 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1171 }
1172 spin_unlock_bh(&np->np_thread_lock);
1173
1174 conn = iscsit_alloc_conn(np);
1175 if (!conn) {
1176 /* Get another socket */
1177 return 1;
1178 }
1179
1180 rc = np->np_transport->iscsit_accept_np(np, conn);
1181 if (rc == -ENOSYS) {
1182 complete(&np->np_restart_comp);
1183 iscsit_free_conn(conn);
1184 goto exit;
1185 } else if (rc < 0) {
1186 spin_lock_bh(&np->np_thread_lock);
1187 if (atomic_dec_if_positive(&np->np_reset_count) >= 0) {
1188 np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
1189 spin_unlock_bh(&np->np_thread_lock);
1190 complete(&np->np_restart_comp);
1191 iscsit_free_conn(conn);
1192 /* Get another socket */
1193 return 1;
1194 }
1195 spin_unlock_bh(&np->np_thread_lock);
1196 iscsit_free_conn(conn);
1197 return 1;
1198 }
1199 /*
1200 * Perform the remaining iSCSI connection initialization items..
1201 */
1202 login = iscsi_login_init_conn(conn);
1203 if (!login) {
1204 goto new_sess_out;
1205 }
1206
1207 iscsit_start_login_timer(conn, current);
1208
1209 pr_debug("Moving to TARG_CONN_STATE_XPT_UP.\n");
1210 conn->conn_state = TARG_CONN_STATE_XPT_UP;
1211 /*
1212 * This will process the first login request + payload..
1213 */
1214 rc = np->np_transport->iscsit_get_login_rx(conn, login);
1215 if (rc == 1)
1216 return 1;
1217 else if (rc < 0)
1218 goto new_sess_out;
1219
1220 buffer = &login->req[0];
1221 pdu = (struct iscsi_login_req *)buffer;
1222 /*
1223 * Used by iscsit_tx_login_rsp() for Login Resonses PDUs
1224 * when Status-Class != 0.
1225 */
1226 conn->login_itt = pdu->itt;
1227
1228 spin_lock_bh(&np->np_thread_lock);
1229 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
1230 spin_unlock_bh(&np->np_thread_lock);
1231 pr_err("iSCSI Network Portal on %pISpc currently not"
1232 " active.\n", &np->np_sockaddr);
1233 iscsit_tx_login_rsp(conn, ISCSI_STATUS_CLS_TARGET_ERR,
1234 ISCSI_LOGIN_STATUS_SVC_UNAVAILABLE);
1235 goto new_sess_out;
1236 }
1237 spin_unlock_bh(&np->np_thread_lock);
1238
1239 conn->network_transport = np->np_network_transport;
1240
1241 pr_debug("Received iSCSI login request from %pISpc on %s Network"
1242 " Portal %pISpc\n", &conn->login_sockaddr, np->np_transport->name,
1243 &conn->local_sockaddr);
1244
1245 pr_debug("Moving to TARG_CONN_STATE_IN_LOGIN.\n");
1246 conn->conn_state = TARG_CONN_STATE_IN_LOGIN;
1247
1248 if (iscsi_login_check_initiator_version(conn, pdu->max_version,
1249 pdu->min_version) < 0)
1250 goto new_sess_out;
1251
1252 zero_tsih = (pdu->tsih == 0x0000);
1253 if (zero_tsih) {
1254 /*
1255 * This is the leading connection of a new session.
1256 * We wait until after authentication to check for
1257 * session reinstatement.
1258 */
1259 if (iscsi_login_zero_tsih_s1(conn, buffer) < 0)
1260 goto new_sess_out;
1261 } else {
1262 /*
1263 * Add a new connection to an existing session.
1264 * We check for a non-existant session in
1265 * iscsi_login_non_zero_tsih_s2() below based
1266 * on ISID/TSIH, but wait until after authentication
1267 * to check for connection reinstatement, etc.
1268 */
1269 if (iscsi_login_non_zero_tsih_s1(conn, buffer) < 0)
1270 goto new_sess_out;
1271 }
1272 /*
1273 * SessionType: Discovery
1274 *
1275 * Locates Default Portal
1276 *
1277 * SessionType: Normal
1278 *
1279 * Locates Target Portal from NP -> Target IQN
1280 */
1281 rc = iscsi_target_locate_portal(np, conn, login);
1282 if (rc < 0) {
1283 tpg = conn->tpg;
1284 goto new_sess_out;
1285 }
1286 login->zero_tsih = zero_tsih;
1287
1288 if (conn->sess)
1289 conn->sess->se_sess->sup_prot_ops =
1290 conn->conn_transport->iscsit_get_sup_prot_ops(conn);
1291
1292 tpg = conn->tpg;
1293 if (!tpg) {
1294 pr_err("Unable to locate struct iscsit_conn->tpg\n");
1295 goto new_sess_out;
1296 }
1297
1298 if (zero_tsih) {
1299 if (iscsi_login_zero_tsih_s2(conn) < 0)
1300 goto new_sess_out;
1301 } else {
1302 if (iscsi_login_non_zero_tsih_s2(conn, buffer) < 0)
1303 goto old_sess_out;
1304 }
1305
1306 if (conn->conn_transport->iscsit_validate_params) {
1307 ret = conn->conn_transport->iscsit_validate_params(conn);
1308 if (ret < 0) {
1309 if (zero_tsih)
1310 goto new_sess_out;
1311 else
1312 goto old_sess_out;
1313 }
1314 }
1315
1316 ret = iscsi_target_start_negotiation(login, conn);
1317 if (ret < 0)
1318 goto new_sess_out;
1319
1320 if (ret == 1) {
1321 tpg_np = conn->tpg_np;
1322
1323 iscsi_post_login_handler(np, conn, zero_tsih);
1324 iscsit_deaccess_np(np, tpg, tpg_np);
1325 }
1326
1327 tpg = NULL;
1328 tpg_np = NULL;
1329 /* Get another socket */
1330 return 1;
1331
1332 new_sess_out:
1333 new_sess = true;
1334 old_sess_out:
1335 iscsit_stop_login_timer(conn);
1336 tpg_np = conn->tpg_np;
1337 iscsi_target_login_sess_out(conn, zero_tsih, new_sess);
1338 new_sess = false;
1339
1340 if (tpg) {
1341 iscsit_deaccess_np(np, tpg, tpg_np);
1342 tpg = NULL;
1343 tpg_np = NULL;
1344 }
1345
1346 return 1;
1347
1348 exit:
1349 spin_lock_bh(&np->np_thread_lock);
1350 np->np_thread_state = ISCSI_NP_THREAD_EXIT;
1351 spin_unlock_bh(&np->np_thread_lock);
1352
1353 return 0;
1354 }
1355
iscsi_target_login_thread(void * arg)1356 int iscsi_target_login_thread(void *arg)
1357 {
1358 struct iscsi_np *np = arg;
1359 int ret;
1360
1361 allow_signal(SIGINT);
1362
1363 while (1) {
1364 ret = __iscsi_target_login_thread(np);
1365 /*
1366 * We break and exit here unless another sock_accept() call
1367 * is expected.
1368 */
1369 if (ret != 1)
1370 break;
1371 }
1372
1373 while (!kthread_should_stop()) {
1374 msleep(100);
1375 }
1376
1377 return 0;
1378 }
1379